ML20137W331

Summary of 970407 Meeting W/Util & Transco Products,Inc Re Versawrap,New Electrical Raceway Firewrap Sys.Attachment 1 Describes Components of Typical Veraswrap Barrier & Attachment 2 Re Transco Products,Inc Test Procedure Encl

ML20137W331
Person / Time
Site:	Arkansas Nuclear, Prairie Island
Issue date:	04/17/1997
From:	Khadijah West NRC (Affiliation Not Assigned)
To:	Marsh L NRC (Affiliation Not Assigned)
Shared Package
ML20137W336	List: ML20137W331 ML20137W362
References
TAC-M82809, NUDOCS 9704180084
Download: ML20137W331 (26)

Text

April 17, 1997 MEMORANDUM TO: L.B. Marsh, Chief Plant Systems Branch Office of Nuclear Reactor Regulation FROM:

K. Steven West, Chief Fire Protection Engineering Section Plant Systems Branch Office of Nuclear Reactor Regulation

SUBJECT:

MEETING WITH ENTERGY OPERATIONS, INCORPORTATED, AND TRANSCO PRODUCTS, INCORPORATED TO DISCUSS VERSAWRAP FIRE BARRIER SYSTEM (TAC NO. M82809)

On April 7,1997, K.S. West, Chief, Fire Protection Engineering Section (FPES), and M.H. Salley, Fire Protection Engineer, FPES, Office of Nuclear Reactor Regulation (NRR),

met with W. Walker, Fire Protection Engineer, Entergy Operations, incorporated (Entergy),

the licensee for Arkansas Nuclear 1 (ANO); and K. Hawks, Manager, Fire Protection Services, Transco Products, Incorporated (Transco). The purpose of the meeting was to discuss Versawrap, a new electrical raceway firewrap system. Transco is developing Versawrap as a possible stand-alone fire barrier or as an upgrade for such existing barriers as Thermo-Lag 330-1.

In general, Versawrap fire barriers are installed (from the raceway out) as individual layers of foil, water filled mylar tubes, fiber blankets, foil, and intumescent-coated fiberglass cloth. The numbers and arrangements of the specific barrier components are dependent on the type of raceway and the desired fire rating. Attachment 1 describes the components of a typical Versawrap barrier and their general arrangements. According to Mr. Walker, Entergy is considering installing 1-and 3-hour fire-rated stand-alone Versawrap barriers at ANO.

According to Mr. Hawks, Northern States Power Company is considering installing a 1-hour fire-rated stand-alone Versawrap barrier at Prairie Island Nuclear Generating Plant.

A full-scale fire endurance test at Underwriters Laboratories, incorporated, Northbrook, Illinois, is scheduled for April 10,1997. Attachment 2 is Transco Products, Inc., Test 1

Procedure TR-228, "Three Hour Fire Test of One and Three Hour VERSAWRAP Raceway Fire Barrier Systems for Conduits and Cable Trays," Revision 2, February 7,1997.

Mr. Walker and Mr. Hawks stated that the attachments do not contain proprietary information.

Docket Nos.: 50-313, 50-282, and 50-306

[

Attachments: As stated Nil 0 FilICENTER COPY CONTACT:

S. West, NRR 301-415-1220 v) lI-D DISTRIBUTION (w/atts):

Central File GHolahan SPLB Reading File PUBLIC SWest BWetzel Plant File MSalley Docket File GKalman Document Name: G:\\SECTIONC\\ WEST \\VWRAPMTG. DOC SC:SPLB:NRR h

SWest 04/(/97

, kl 4

"" AL RECORD COPY 9704180084 970417 PDR ADOCK 05000282 F

PDR

lkM % H M bM I L TRANSCO, PRODUCTS INC.

EXECUTIVE OFFICES FiRy Five East Jackson Boulevard Suite 2100 Chicagn filinois 6060M166 Kenn J. Hawks 3jg.437.ggjg Afanager. Fire Protecnon Sernces Facsimile 312-127-4975 Celebrating our 61" year (1936-1997)

' March 24,1997

Subject:

VERSAWRAP Raceway Firewrap replacement or upgrade to Thermo-Lag

]

Dear Sir,

Transco Products Inc. would like to introduce VERS AWRAP (patent applied for), a raceway firewrap system, as a possible solution to your current raceway fire barriers. This is a totally new i

concept in fire protection systems. This extremely versatile product is able to be installed as a stand-alone or upgrade, over existing raceway firewrap, system.

s VERSAWRAP is the solution to all of your raceway barrier needs. It is far superior to existing systems for the following reasons:

a)

Economical VERSAWRAP is the least costly system available as a GL 86-10 qualified firewrap for large and small conduits, free air cable drops, trays from 2" to 30" wide, aluminum or steel, and junction boxes both wall mounted and free air as a upgrade or stand-alone.

b)

Installation This product is easily installed. Transco will offer the option to provide 4

this as a totally complete " turn key" installation, train and certify your own site personnel for installation and inspection or any combination of this.

j The key advantage to the VERSAWRAP system is it's simplicity, using the l

same basic installation techniques for all types of applications.

c)

Light weight It is lighter than any current raceway barrier systems. If you require a i

seismically qualified installation this product, due to it's light weight, will easily meet your site requirements.

d)

Deration Very low ampacity deration factor due to the fact that it derives very little ofit's performance from insulating materials there will be only a very slight increase in the current cable deration.

e)

Easy access The VERSAWRAP system can be installed as a totally dry system with a minimal amount of attachment allowing ready access to the protected equipment without destroying the installed materials.

j 1

5 4 rnnono mov ne Tur To wcen contm

TRANSCO PRODUCTS INC.

VERSAWRAP March 17,1997 Page 2 of 3 f)

Simple Fast and easy surveillance requirements, this simple, sturdy installation will not become damaged by normal plant activities.

g)

Unlimited The shelf-life for these materials are unlimited, as long as properly stored, allowing sites to maintain a readily available stock of materials.

h)

Local All products used in this system are made in the USA. This reduces time required for deliveries and reduces cost by eliminating expensive overseas I

shipment cost and import duties.

i)

Safe Recently, there has been some concerns raised about the use of ceramic fibers, due to their potential health hazards. Transco has selected material which pose a significantly less health risk there by eliminating some possible restrictions during installation.

The VERSAWRAP system has already demonstrated, through numerous fire tests, that it can provide protection to raceway for as long as 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. The 1 and 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> systems currently demonstrate a large margin of safety which will provide additional conservatism to your plant fire l

protection program.

Transco has currently scheduled an extensive test program in support of upcoming installations at Entergy (Arkansas Nuclear One) and Northern States Power (Prairie Island), to be performed at Underwriters Laboratories in North Brook, Illinois, on April 10,1997. You are cordially invited to attend and witness the installation of materials or the fire test to see first hand the performance of the system. We have attached a schedule calling out some of the key dates for your information and a list of hotels located close to the test laboratory.

We have also attached some general information which describes the VERSAWRAP's general arrangement, weight and products involved. A demonstration and additionalinformation about the VERSAWRAP system can be provided at your site at your convenience.

Please review the above and feel free to contact us should you have any concerns or require further information.

Sincerely, TRANSCO PRODUCTS INC.

l Kevin J. Hawks Gregory J. Jarosz writers' extension 113 Product Manager w/ attachments extension 136 l

l l

March 1997 May 1997 S M T W T F S fl S M T W T F S 1

1 2 3 2 3 4 5 6 7 8 VERSAWRAP FIRE TEST 4 5 e 7 8 9 o

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TRANSCO PRODUCTS INC.

Material Specification: #TCO-700 Page1of2 Transco Products Inc. #TCO-700 VERSA WRAP ELECTRICAL RACEWA Y FIRE BARRIER SYSTEM Transco Products Inc.'s VERSAWRAP is a economical, easy-to-install, passive system for protecting electrical raceways for both one and three hour fire ratings in accordance with the requirements of the USNRC's Generic Letter 86-10, Supplement 1. Depending on the end-user's needs, VERSAWRAP can be used either as a stand-alone system or as an upgrade overlay to cover existing barrier materials to bring them into full compliance.

Both one and three hour systems consist of an innovative arrangement of heat absorbing water modules, fiber blanket, and stainless steel foil covered with an outer intumescent ceramic wrap. He ceramic intumescent activates and expands upon exposure to high temperature or fire and thus provides superior protection to the raceway and cables within, as well as any other substrate materials. He use of the intumescent wrap allows for a significant reduction in the design thickness of the fiber blanket portion of the barrier. This considerable reduction in the reliance on the fiber blanket results in a system that is both thinner and lighter that will contribute to a more favorable ampacity derating factor. As a thin and lightweight system, VERS AWRAP is a designer and installer friendly system. The compartmentalized water modules act to absorb heat during a fire as thermal mass. When exposed to higher temperatures, the modules are designed to melt to let steam escape into the surrounding blanket to further cool the assembly.

As its name implies, VERS AWRAP is a versatile, flexible, temperature resistant system that is adaptable to just about all field configurations including those where tight spaces make other systems difficult or impossible to install. VERSAWRAP utilizes a' simple cut-and-tie installation. The vast majority of installations can be performed as completely dry work. However, wet lay-ups of the outer intumescent wrap are allowable as needed.

Typically, VERSAWRAP is installed as individual layers of water modules, fiber blanket, foil, and intumescent outer wraps. He water modules are supplied as flat sheets ofinterconnected scaled tubes of water that are wrapped around the raceway. nese sheets are supplied in three different lengths to suit field installation needs. He number of tubes installed around the raceway reflect the one and three hour systems as tested. Each layer of the system is generally held in place using 18 gauge stainless steel wire that is. " twist-tied" at its ends. In certain instances, installations can be supplemented with lightweight, metal frames to support the wrap where there is no suitable underlying substrate to suspend the flexible system. Being flexible, VERSAWRAP can be bent or squeezed into spaces that are less than the wrap's normal, uncompressed thicknesses (as tested). Other forms of attachment to and/or over the raceway are acceptable such as the use of concrete expansion anchors to secure the wrap to walls and ceilings where the raceway is in close proximity to the architectural barrier.

Installation procedures show that layers are placed utilizing both overlapping and butt joints at longitudinal and axially seams. It is recommended that thejoints of subsequent layers be staggered to optimize the overall structuralintegrity of the completed installation. Because of the geometry of certain field raceway configurations, it is acceptable that not alljoints be staggered (i.e., some conduit bends) as identified in the installation procedures in order to reflect tested conditions.

4 1

1 TRANSCO PRODUCTS INC.

2 Material Specification: #TCO 700 Page 2 of 2 Transco Products Inc #TCO-700 VERSA WRAP ELECTRICAL RACEWA Y FIRE BARRIER SYSTEM TwicalProverties:

4 1

Outer Wrap information:

j

- Color of Ceramic Coating:

. White

- Flame Spread of Ceramic Coating:

.. 0 (*)

(*): Based on 100 for untreated red oak

- Fuel Contribution of Ceramic Coating:

0(*)

]

- Smoke Generation of Ceramic Coating:

0(*)

- PH of Ceramic Coating (wet):

7.5 l

- Flash Point of Ceramic Coating (wet):

.. None

- Cure Time of Ceramic Coating:

. 4 day:;

4

- Environmental /Heakh Information for j

Ceramic Coating (wet):

HMIS Heahh:

.......1 Flammability:

...O f

Reactivity:

.....O Personal Protection:

.B

- Weight of Uncoated Fabric Reinforcement (or./sq. pl):

60 (x 2)

Tie Wire:

. 18 gauge s.s.

Banding (if used):

. %" wide s.s.

i Fiber Blanket Information:

j

-Thickness Each Layer:

As Required by Test

- General Composition:

... Ceramic i

- Manufactured Density:

.. Nominal 8 lb.

-Nominal Specific Gravity:

. 2.65 l

- Nominal Percent of Linear Shrinkage at 1,800*F:

.1.6

- Health / Safety Information:

.... Material should be treated as a ceramic blanket material (see attached data sheet)

- Foil Information:

20 mil s.s.

i NOTE:.SPECIFICA TIONSARE SUBJECT TO CHANGE IF7THOUT NOTICE.

i 4

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SIZE SIZE 1

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4 4.5 4.59 9.06 4.59 9.96 6

6.5 6.12 12.83 6.12 12.83

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IWEIGHT PER SQ / FT 3.25 7.41 3.25 7.41 i

,ALL WEIGHTS REPRESENT THE MAXIMUM TOLERANCE l

lWITH AN ADDITIONAL 10% ADDED SAFETY MARGIN vc wlbs TRANSCO PRODUCTS INC.

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ot.szewsst Specialty Glass Fiber TO:

10-8 December 29, 1993 FROM:

H. A. Rhoa CC:

G. W. Deren 7W 5:l'0

P. J. Viola RE:

THERMAL STABILITY INSULFRAXu 1800 BLANKET Since the introduction of Insulfrax" products at the 1993 sales meeting, questions have been raised regarding the thermal stability of Insulfrax" 1800 Blanket, and the margin of safety inherent with the product.

During the sales meeting, the thermal shrinkage performance of Insulfrax* 1800 Blanket was compared to Durablanket-S*.

On the attached chart, the shrinkage comparison is extended to Durablanket' 2600. Based on an average of all thermal shrinkage data generated to date, insulfrax* 1800 Blanket is the most stable blanket product available at temperatures up to 1800*Fl Typically, Fiberwalla linings are designed to compensate for shrinkage up to 3%.

In critical applications up to 1800*F where minor shrinkage cannot be tolerated, Insulfrax* 1800 Blanket exhibits less than half the shrinkage of a Durablanket-S*

or Durabianket' 2600 lining!

The chart below compares the continuous use limit, recommended use temperature and failure temperature for a range of fiber products:

j Design Recommended Margin of Safe Temperature Use Failure Product Limit (*F)

Temperature (*F)

Point (*F)

'F

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/

Insulfrax 1800 B1anket 1800 1800 2200 400 22 Durablanket-S*

2300 2100 2600 500 24 l Durablanket-2600*

2600 2450 2700 250 10,

Fibermax* M'at' 3000 2800 3100 300 11 As the comparison presented above points out, the " margin of safety" for l

Insulfrax" 1800 blanket is extremely conservative and consistent with that of existing products.

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BY lMPROVED CHEMISTRY 1

i By Gary Deren Product Development vent fibers from becoming airborne.

l Market Development Manager Since the invention of ceramic fiber From 1990 to 1993, over 150 new fiber and Mark A. Rhoa, Product Manager by J. C. " Charlie" McMullen, a chemistries have been developed and Fibers Division Carborundum research scientist, in tested (see Figs. I and 1A). The devel-The Carborundum Co.

1 1942, The Carborundum Company's opment of the calcium, magnesium, sil-Niagara Falls, NY ceramic fiber products (Fiberfrax@)

icate fiber (Insulfrax) is an early end-have been the source of innovative product of this work (see Figs. 24).

insulating solutions, providing energy j

savings, for a broad range of indus-Product Forms and General I

n evolutionary breakthrough tries. Now the company, with exten.

Properties l

In insulating materials entails sive research and development activi-Currently, the new product is made

_ _the combining of a completely ties, produces ceramic fiber (Fiberfrax) in a variety of forms - bulk fiber, nee-new fiber chemistry with proprietary in nine separate manufacturing facili-died blanket, Anchor Loc @ modules j

fiber spinning technology to create a ties in six countries.

and bonded modules - for applica-specialty high temperature glass fiber Development of the high tempera-tions that include refractory linings, i

with superior thermal and mechanical ture fiber of new chemistry (Insulfrax) thermal insulation, fire protection and properties. 'Ihe new class of product-is the direct result of Carborundum's metals transfer. The various product i

was developed by Carborundum Co.

on-going commitment to a prc.5 ev forms, Fig. 5, demonstrate excellent from a calcium, magnesium, silicate stewardship program This progwx..s thermal stability at temperatures up to chemistry, Table I, with limiting tem-structured to reduce the potential han-1000*F (1832*F) after exposure to water perature of 1000*C (1832*F). Tensile dling hazards associated with all types immersion or high humidity. The strength of this product family of fine fibers generated during han-material also provides outstanding (Insulfrax@) is enhanced by the spin-dling of ceramic fiber products, by wetting resistance to molten aluminum ning technology. In addition to good decreasing the dose of airborne fibers alloys. Testing with corrosive alu-strength, the products are light weight, generated during handling of ceramic minum alloys at elevated temperatures i

flexible, possess excellent acoustical fiber products, creating fibers that will has proven these fibers to be superior j

properties and exhibit excellent ther-dissolve more readily in body fluids, to traditional alumina / silica refractory j

mal characteristics, and increasing fiber dimensions to pre-ceramic fibers (see Fig. 6).

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stress during service. Its high fiber. folded blanket layers are secured to the onion peNeh index (low percentage of unfiberized metallic module anchor with several l

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particles) contributes to the excellent alloy support tubes (see Fig.10).

thermal performance. This bulk fiber Flanges on the tube ends effective!v j

is the feedstock for the product line lock the position of the tubes relativ'e

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and vacuum cast shapes. Typical tion. Four attachment systems, Fig.11, l

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dent upon the needs of the specific j

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Blanket (1800) is produced from the Bonded Modules

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spun fibers eliminate the need for 1800 blanket, comprise folded blanket, mm j

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binders in the product manufacture tightly compressed and banded (see Fig.

and produces a high tensile strength 5). They can be installed as a hot face Fg. s mana/ conductury of cao-ugo Sio, product. The blanket is completely veneer over existing refractory or with j

modules as Ancaon ofenean temperature and inorganic and thus exhibits no smoke hardware (HeftyI.ock") as a full thick-l

• du 'FP*

generation or outgassing in service.

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kan for tushng matedalshankage Tyncat snnnkage of blan.

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trcdules.

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A.

OLSZEWSKI nsulfrax' Specialty Glass Fiber To:

10-8 December 16, 1994 From:

M. A. Rhoa cc:

A. Banks-Rainford X.Cheeseman-Paris MAb G. W. Deren A. P. Norris

Subject:

INSULFRAXe PRODUCTS J. R. Olson CUSTOMERS' OUFSTIONS L. A. Peekstok P. J. Viola D. Yardley-Rainford i

When In'sulfrax* specialty glass products were commercialized, health and safe handling guidelines were published to introduce the product.

Over the past two years, customers have raised additional questions related to classification, l

labelling and advantages of Insulfrax fiber products, l

Several que' tions frequently asked by customers are answered below:

s 1)

Is Insulfrax fiber RCF free?

If so, why is this fact not stated in the Material Safety Data Sheet?

Answer Yes, Insulfrax fiber is a high temperature glass, not a ceramic fiber product.

The chemistry of Insulfrax fiber (65% silica, 31% calcia, 3% magnesia) falls outside EPA's definition of RCF products:

"An amorphous man-made fiber produced from i

the melting and " blowing" or " spinning"' of calcined kaolin clay or a combination of alumina (A10 ) and silica (SiO ).

Oxides 3

2 such as zirconia, ferric oxide, titanium oxide, magnesium oxide, calcium oxide, and alkalies may also be added.

Approximate percentages (by weight) of components may vary as follows: Alumina, 20 to 80 percent; silica, 20 to 80 percent; and other oxides in lesser amounts, approximately 1

to 5 percent (CAS number 142844-00-6)."

4 4

b e

G

_, -~

i Insulfrax Products Customers' Questions December 16,-1994 j

~Page Two l

Although Insulfrax fibers were developed for increased solubilization and leaching of components in simulated body fluid, we do n.ql have absolute scientific proof that Insulfrax* fibers are safe.

Carborundum avoids using statements like "contains no RCF" or " asbestos free" on our products since the connotation associated with this labelling-is that the product is inherently safer than RCF or asbestos, j

2)

Is Insulfrax fiber classified 'as a Group 28 agent (possible human carcinogen)?

4 i

l In 1987, the International Agency for Research on Cancer (IARC) reviewed

-elevant health and experimental data on man-made vitreous fibers.

Based on t

LE5 review, IARC classified all man-made vitreous fibers as a 28 "possible human carcinogen." Insulfrax, like Fiberfrax* RCF, Fiberglass and Mineral Wool l

falls into the classification of man-made vitreous fibers as defined by TIMA

[

(Thermal Insulation Manufacturers Association).

'3).Since the handling practices in the Material Safety Data Sheets are the same, how are Insulfrax products different from Fiberfrax RCF products?

t

~Insulfrax glass fiber and Fiberfrax ceramic fibers are produced in the same-i process furnaces, therefore, there are similarities in fiber appearance and geometry. Due to the fiber chemistry, discussed earlier, thermal and physical j

properties of the products are different.

j Carborundum's recommendation to handle Insulfrax fiber in the same manner as j

Fiberfrax RCF products is based on two factors:-

4 a)

The absence of absolute scientific evidence proving 'that Insulfrax is j

safer than Fiberfrax ceramic fiber.

j b)

Consistency with the best industrial hygiene practices which seek to reduce worker exposure while continuing to decrease the potential hazards associated with the product.

4) What are the advantages of Insulfrax in comparison to Fiberfrax. fibers?

a). Increased Fiber Solubility

' In a' recent monograph, IARC stated that fiber dose, dimension and durability in the body were key factors in determining a fiber's carcinogenicity.

On the attached chart (Attachment A), the solubility of Insulfrax fiber is compared to other natural and man-made industrial fibers.

Note that y

this testing, conducted with simulated lung fluids in the lab, is not conclusive scientific proof of the material's safety, however, it does provide a " signal" to researchers as to the potential hazards associated with inhaled fibers.

l

. ~. _ _ _

d Insulfrax Products.

Customers' Questions December 16, 1994

- Page Three l

4) b)

Reaulation/Recortina Since insulfrax ~ products fall outside the CAS (and EPA) definition of refractory ceramic fiber, they are not subject to the same reporting and approval regulations as Fiberfrax RCF products.

As a result of being i

classified as specialty glass fiber, Insulfrax is not subject to the EPA's I

Significant New Use Rule (SNUR) or the TSCA export reporting requirements i

which regulate Fiberfrax ceramic fiber sales.

4 1

l c)

Thermal Stability (Shrinkaae Resistance) j Based on thermal shrinkage tests performed on blanket samples, Insulfrax fibers shrink less than RCF fiber chemistries at temperatures up to 2200*F l

(see Attachment B).

)

{

d)

Molten Metal penetration Resistance Due to the calcia/ silica chemistry, vacuum cast shapes, boards and gaskets made from Insulfrax resist penetration of aluminum better than Fiberfrax RCF products.

Results of molten metal penetration tests are attached (Attachment C).

3

?

If your customers have additional questions about Insulfrax products or if you i

would like to discuss product performance or properties in greater detail, please contact this office, 716/278-2019.

i Note that this mailing will be sent to distributors and vacuum casters in your sales territory within the next two weeks.

i F

MAR:lc i

Attachments j

i; 1

4 a

,v

i i

nsu fraxt :

i Specialty Glass. Fiber i

I A-Ol'M" I To:

Septecher 14, 1994 l

G.W.Derenf From:

cc:

P. J. Viola Insulfrax* Team -

4 i

Subject:

INSULFRAX* PRODUCTS DISSOLUTION IN SIMULATED LUNG FLUID A key element of Carborundum's f roduct Stewardship Program is dedicated to i

developing systems and products whici: effectively reduce the risk associated with i

industrial fibers.

Insulfrax* products, an early end product of this effort, were designed to dissolve readily in simulated lung fluids.

In order to compare the solubility of Insulfrax fiber with that of other common industrial fibers, Dr. Bruce Zoltos prepared the attached explanation and graph for Carborundum's in vitro tests.

Based on laboratory tests with simulated lung fluid, Insulfrax fiber with a one micron diameter dissolves in 3 weeks.

This compared favorably with other industrial fibers like E-Glass (+1 year) and RCF (approximately 2 years).

i Please note in your discussions with suston.ers that this testing, conducted with simulated lung fluids in the lab, is nr.t conclusive scicatif,'is-prooi of the material's safety.

The results do pr.) vide c ' signal" to resuarchus u to the potential hazards associated with inheling the. product.

If your review of the attached graph raises seditioqal, questions, please contact this office, 716/278-6163.

GWL:lc Attachment i

e i

i DISSOLUTION OF 1 MICRON FIBER BASED ON CARBORUNDUMINVITROTEST 1.1 CROCIDOLITE I

I ASBESTOS O.9 FIBERGLASS 2 0.8 h0.7 ROCKWOOL

[

$.6 0

s.

q E-GLASS g0.5 2

t UA RCF-1

'J 0.3 t

0.2

IBERGLASS 1 g SLAGWOOL j INSULFRAX I

i 0

i 0

100 200 300 400 500 600 700 800 900.

TIME (DAYS)

l i

l l

)

One key product feature of Insulfrax Specialty Glass. Products, i

which was discussed at the time of introduction, is the fiber's increased solubility in simulated lung fluid.

To measure the dissolution rate of fibers in simulated lung fluid, a 28-day corrosion test is conducted.in which SLF is pumped over the fibers e.t 98.6*F.

Glass corrosion p'roducts are then measured.in the solution and used to calculate the rate at wh'ich the fiber dissolves.

Using thi's method, dissolution rates were measured for various fibers.

Based on this dissolution rate, the time required for a l

1 micron fiber to dissolve in SLF was calculated.

These values -

are shown in the following table and graph.

DISSOLUTION TIME TO DISSOLVE FIBER RATE 1 MICRON FIBER SLAGWOOL 296 ng/cm' elut 2.5 weeks FIBERGLASS 1 292 2.5 INSULFRAX" 255 3.0 FIBERGLASS 2 81 9.6 ROCKWOOL 26 30 E-GLASS 13 60 RCF-1 8.0 97 CROCIDOLITE ASBESTOS 0.2 3869 This shows that, based on in vitro labo'ratory measurements, a1 micron Insulfrax" fiber dissolves-in about 3 weeks..This may be compared to RCF which dissolves in two years and asbestos which would require approximately 74 years to dissolve.

Biological durability is considered to be one of the key factors, along with fiber dimension and amount of fiber inhaled-(dese), in l

determining potential human health effects.

To date no animal or human', health data is available f or Insultrax" products.

\\

l I

Health &

Safe Handling information on Insulfrax* Specialty Glass Fiber Questions and Answers

1. Whatis insulfrax* fiber?

5. How do insulfrax fibers compare to asbestos fibers?

Insuffrax fibers are made from a vitreous inorganic Asbestos is a natut a!!y occurring crysta!!ine mineral composition of conventional glass making oxides. This which is readily seg arated into long, thin, flexible fibers composition renders Insulfrax fibers more subject to during processing. Since the fibers are of small diameter leaching and solubilization of components in simulated (generally less thal one micron), they tend to readily body fluid tests than many other manmade vitreous fibers become and remain airbome. Further, asbestos fibers (MMVFs), such as refractory ceramic fibers, mineral wool tend to split longitudinally into finer fibrils when handf ed.

and many types of fibrous glass. Typical uses for insulfrax in contrast, most manmade vitreous fibers, including fibers include thermal insulation (with a normal use limit Insulfrax fibers, break transversely into shorter lengths of 1000*C), acousticalinsulation and mechanical due to theirglass structure, reinforcement.

2. Howls the solubility of fibers generally evaluated?

6. Have Insulfrax fibers been evaluated for potential human health effects?

The Carborundum Company evaluates the solubility of libers using a continuous flow leaching test simulating No. Recently, state-of-the-art animallnhalation studiec lung fluids. The fibers are exposed to a constant flow of were completed on fibers whose solubility and chemistry fluid for a specified period (usually 28 or 120 days). After are similar to that of Insultrax products.These tests exposure, the fibers are analyzed to determ,ne the amount showed no harmful effects in laboratory animals. Results i

of dissolved material. Solubility is expressed as the mass for Irsulfrax fibers will be presented when available.

of all dissolved components per surface area of the sample

7. Are there any human health risks associated with perday.

Insulfrax fibers?

Solubility is considered to be one of the key factors, Yes. Most fibers by their very nature tend to be irritatng along with size and the amount of fiber inhaled, in deter.

to the eyes, skin and respiratory system. Animal studies mining potential human health effects. To date no animal demonstrate that very high exposures to any type of res-or human health data ls available for insulfrax products-pirable fiber can provoke an inflammatory reaction in the

• Please consult the Material Safety Data Sheet for safe lung. Long-term exposure should be avoided. We strongly handling recommendations and details of health related recommend that airborne levels be maintained as low effects forinsulfrax products.

as practicable, and that engineered controls along with ti. How was Insulfrax fiber developed?

protective clothing and properly fitted HEPA-filtered The Fibers Division of The Carborundum Company respirators be used.

l has been a leader in the development of high tempera-l ture fibers for many years. For the past several years,

8. Is insulfrax fiber Insulation safe to use?

Carborundum has dedicated substantial resources t We f rmly believe that Insulfrax fiber materials can be I

di e

eed developing ficers that are more prone to solubilization and teaching of components in simulated body fluid handling practices. By following the recommended work testing.The development ofInsulfrax fibers is an early ractices described in the Material Safety Data Sheets end product of this work.

(MSDSs), worker exposures can be kept at a minimum.

Please review the MSDS carefully prior to working with

4. How is Insu!frax fiber classified relative to traditional Insulfrax fiber materials.

Insulating fibers, fibrous glass, mineral wool and refractoryceramic fibers (RCFs)?

losuffrax fibers are classified as manmade vitreous fibers together with discontinuous fibrous glass, mineral wool and refractory ceramic fibers (RCFs). Insulfrax fibers are classified with other alkaline silicates as a specialty glass fib,er.

l l

l

9. How does the International Agency for Research on

13. What levels of airborne Insulfrax fibers are typically Cancer (IARC) classify insuffrax fibers?

seen in the workplace?

IARC, a branch of the World Health Organization has The fiber size and geometry ofinsuffrax f bers are developed a classification system designed to indicate similar to many other glass and mineral fibers. Based the potential human health effects of various substances.

on workplace monitoring of various manmade vitteous Their determinations are based on a carefui review of fibers, the potential exists in certain handling operations available scientific data derived from both animal and for dust levels in excess of the recommended exposure human epidemiology studies.

guideline (REG). It is important to first determine the actual Insuffrax fibers have not been reviewed by IARC.

workplace exposures and then develop appropriate controls However, in 1987, the IARC reviewed all available infor.

and safety practices to minimize worker exposure. In all mation on other manmade vitreous fibers and classified cases where the airbome exposure potential is unknown, discoritinuous fibrous glass, mineral wool and refractory proper respiratory protection must be used.

ceramic fibers (RCFs) as *28 - possibly carcinogenic to humans.

14. Is cristoballte formed when Insulfrax fibers are exposed to elevated temperatures?

10. Are insulfrax fibers regulated by any federal or insuffrax fibers do not form cristobalite (a form of state agencies?

crystalline silica) when exposed to temperatures up to Currently, no manmade vitreous fibers are regulated their recommended use limit of 1000*C. Chemical trans.

by any federal agency. However, OSHA has proposed formation in normal use results only in the formation of a

a permissible exposure level of 1 fiber / cubic centimeter crystalline forms of calcium silicate. Over firing (tempera.

(1 f/cc) 8 hr. TWA for discontinuous fibrous gfass, mineral ture exposure exceeding 1000*C) can result in a partial wool and refractory ceramic fibers (RCFs).This proposal transformation to cristobalite if partial melting of the will be subjected to public review and comment in the product occurs, future. Califomla's Proposition 65 currently requires specific labeling of most manmade vitreous fibers.

15. What procedures are recommended for clean-up of scrap and "after service"Insulfrax fibers?

11. What is The Carborundum Company's recommended HEPA-filtered vacuums or wet handling procedures exposure guideline (REG) for insulfrax fibers?

have been found most effective in minimizing the potential Carborundum recommends a maximum exposure of for airbome dust during clean-up operations. All scrap 1 fiber / cubic centimeter (1 f/cc) 8 hr.TWA. This guideline materials should be placed in a covered *dumpster" or is consistent with the recommendations of the manmade in heavy plastic bags before transport to a landfill.

vitreous fibers producers for fibrous glass, mineral wool and RCFs. As with all potentially dusty materials, personal exposures should be minimized through prudent handling practices and appropriate engineered controls. Please consult the product Material Safety Data Sheet (MSDS) prior to working with insuffrax fibers.

12. What personal protection measures does Carborundum recommend when handling insulfrax fibers?

Property designed and operated engineered controls should be used whenever feasible to control potential dust exposure. lf workplace monitoring indicates personal I

exposure potentiat in excess of the recommended expo.

sure guideline (REG), properly fitted respiratory protection should be used. In addition, proper respirators should be wom by workers who experience throat irritation.

Safety glasses or goggles, work gloves, head covering and full body clothing will minimize the potential for eye and skin Jrritation. Disposable covera!!s should be disposed of property'and launderable clothing should be laundered separate from other clothing.

S

-