ML17275A733
| ML17275A733 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 06/13/1980 |
| From: | Hafer C SOUTHWEST RESEARCH INSTITUTE |
| To: | |
| Shared Package | |
| ML17275A731 | List: |
| References | |
| NUDOCS 8012090308 | |
| Download: ML17275A733 (12) | |
Text
Item 4 Investigation of Surface Huring Characteristics Of a Solid Silicone Sheet Material, NS-1 8 0zeOQOgog
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SOUTHWEST RESEARCH INSTITUTE Department of Fire Techno(ogy POST QFFlCS ORAVI6R 285r0.
6220 CULEBRA RO.
SAN ANTONlO. TcXAS 782ooS INVESTIGATIONOF SURFACE BURNING CHAHACTZH.ISVICSOZ:
A SOLID SILICONE SHEET MATERIAL, NS-1 PROJECT NO. 03-5849-285 FINAL REPORT By C. A. HAFER JUNE 13, 1980 r
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~,J Prepared for:
BRAND INDUSTRIAL SERVICESI INCORPORATED 1420 RENAISSANCE DRIVE PARK R IDGEI ILLINOIS 60068 Carl A. Hafer, P.E.
Project Manager Standard Testing l
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INTRODUCTION This report presents the results or a flame spread tunnel test. on a
solid silicone sheet
- material, submitted for evaluation by Brand Industrial
- Services, Incorporated of Park
- Ridge, Illinois.
The report contains a
description of the material
- tested, the preparation and conditioning of the specimen, the test procedure, and finally, the test results.
Note that the results only apply to the specimen
- tested, in the manner
- tested, and not to the entire production of this or similar materials, nor to this material's performance when used in combination with other materials.
All test data are on file and are available for review by authorized persons.
The test was conducted in accordance with the provisions of'STM Designation E84-79a, "Standard Method of Test for Surface Burning Characteristics of Building Materials."
This test method is similar to
. the test method specified in ANS No. 2.5, NFPA No. 255, Ul No.
723<
U BC No. 42-1, and ASTiVl E84-75;
- however, two improvements have been incorporated in the current E84-79a procedure, i.e.,
the stack pressure control top has be n relocated to a position forward of the burners and the formulae used to.calculate the flame spread has been modified--resulting in slightly tower values.
The purpose ol'he test was to evaluate performance of the test specimen in relation to that of asbestos-cement board and red oak flooring under similar I'ire exposure.
The results are expressed in terms of flame spread, fuel contribution, and smoke development during a 10-minute exposure and-are recorded as a-ratio with asbestos-cement board 0 and red oak flooring 100.
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DESCRIPTION OF MATERIALS On May 27,
- 1980, four 20 x 75-in.
(0.508 x 1.905-m) sheets, of a
~/
black solid silicone material and 24 tubes of caulk were received from the Sponsor'.
They were identified as:
NS-1, a 3/4-in (19.05-mm) solid silicone sheet material.
The caulk was identified as Dow Corning 732 caulk.
The material I-ad an average unit weight or 1.421 Ib/ft'-
(6.928 kg/m~),
Project No. 03-5849-285 Ill. PREPARATION AND CONDITIONING OF TEST SPECIMEN The specimen was preoared by applying 1/8 to 1/4'in.
(3.175 to 6.35 mm) caulk beads with 4-in.
(101.6-mm) center lines onto 1/4-in.
(6.35-mm) asbestos-cement board.
The board was then joined with the four 20 x 75-in. (0.508 x 1.905-m) sheets of silicone material to provide a nominal 21-in. x 25-ft (0.533 x 7.625-m) specimen.
The specimen was conditioned for 6 days in an atmosphere main-tained'etween 68 and 78'F (20 and 26'C) temperature and 45-to 55-percent relative humidity.
IV.
TEST PROCEDURE The test was conducted on June 5,
1980.
Reference data were obtained and furnace operation checked by conducting a 10-minute test with asbestos-cement board on the" day of the test and by periodic tests with red oak flooring.
These tests provided the 0 and
'I'00 references for flame spread, fuel contribution, and smoke density.
Ignition over..
the burners was noted 39 seconds after the start of the test in the most recent caiibr ation with red oak flooring.
Each specimen to be E
evaluated was tested in accordance with the standard procedure.
V.
TEST'ESULTS The test results were calculated on the basis of observed flame travel and the measurement of areas.
under-the recorder curves of
~ 'urnace temperature and smoke density (see 'Classification Table).
To aflow for possible variations in results due to limitations of the test
- method, the numerical results were adjusted to the nearest figure divisible by S.
'ecorded data for flame spread, fuel contribution, and smoke den-sity of the specimen are shown in, the figures at the end of this report as a solid line on each 'graph.
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0 Project No. 03-5849-285 CLASSIFICATION TABLE Test Soecimen Flame Spread Rate E84-79a Fuel Contribution Smoke Densit Asbestos-Cement Board Red Oak Flooring Solid Silicone Sheet
- Material, NS-1 0
100 10 0
100 0
100 530 Vl.
OBSERVATIONS DURING AND AFTER TEST The observations made during and after the test are summarized as follows:
Spotty ignition was observed at 40 seconds,
~uith cracking of the surface at 3 00 minutes.
The flame front advanced to
.11 ft (3.355 m) at 9:00 minutes.
Afterflame persisted for 1:23 minutes.
The silicone material cracked to 81/2 ft (2593 in).
A white discoloration extended to the end, 25 ft (7 625 m).-
Project No. 03-8849-2S5 25 20 VJ 15 V
10 u
5 Red Oak AC Board 4
I/2'gniting
~ Flame 2
3 4
5 6
7 6
Time (minutes)
~
FLAMESPREAO 9
10 Q Burner (1')
1250 1000 u
750 Q
I 500 a
250 Red Oak A C Board I
2 3
4 5
6 7
B 9
10 Time (minutes)
FUEL CONTRIBUTION (Furnace Temperature) 35 30 25 20 15'0 5
0 Red Oak A C Board 1
2 3
4 5
"6 7
6 9
10 Time (minutes)
SMOKE OENSITY (M V Oepression-Photocell)
SURFACE 8URNING CHARACTERISTICS OF A SOLID SILICONE SHEET MATERIAL, NS-1
'tl 3 6 8 )l 1 5 - < 7. q
Item 5
Summary of WNP-2 Mock-up Test Re ar'din Heat In ut to Shield Material The purpose of the mock-up tests was to qualify the BISCO NS-1 (high density) shield material with respect to heat input during welding.
The mock-up test fixture simulated actual wall conditions expected at time of welding, e.g.,
the joint configuration was the same as that required for the actual circumferential weld repair and the gaps within that configuration ranged from 1/16 x 1/16 to 5/8 x 2-1/2 inches (see picture 1).
The mock-up fixture gaps were filled,with BISCO NS-1 (high density) shielding material to approved procedures that were developed during prototype testing (pictures 2 and 3).
The shield material was allowed to cure (picture
- 4) and then the excess material was ground out (picture
- 5) to allow room for the insertion of, the.backing "ring prior to welding (picture 6).
The joint was welded in accordance with the corrective action plan submitted to the NRC for the plug weld deficiency (picture 7).
All conditions, including material, represented actual conditions of the SSl/.
It should be noted that the heat input was more conservative for the mock-up test because the mock-up fixture did not have available to it the massive steel/concrete heat sink available to the joint configu-ration at the 541'-5" elevation of the SSW.
After cooldown, the mock-up fixture was sliced transversely to provide cross sectional views of the gaps filled with the shield material and the weldment (picture 8).
There was no deleterious effects observed in either the shield material or the weldment.
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Picture 5
Picture 6
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