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Silicone elastomers outperform organics with proven
temperature resistance up to 600*F. Even under extreme heat, these
compounds provide superior tensile strength, elongation and abrasion
resistance.
Despite extreme temperatures as low as -100*F, most
silicone elastomers retain durometer and modulus. Special grades
have brittle points below -150*F and remain serviceable at temperatures as
low as -130*F.
Silicone elastomers offer incomparable resistance to
compression set deformation, even at temperatures as low as -120*F or as
high as 500*F.
Silicone elastomers provide unequalled electrical
properties over a wide range of temperatures. The rival mica in
terms of resistance to high-voltage ionization and corona. Plus,
they show far less dielectric fatigue than TFE resins or organic
elastomers.
Underwriters Laboratory Flame Test (UL94) is the standard
measure of a materials resistance to burning. This UL test is
performed no a test sample 5" x 1.2". A 3/4" Bunsen
flame is applied for 10 seconds to a vertically supported sample immersed
3/4" into the flame. The time for burning to cease following
the initial 10 second exposure is noted. The flame is applied again
for 10 seconds and the time for burning to cease including glowing
is noted. A total of 5 samples are tested in this manner. Five
additional samples aged for 7 days at 70*C are also tested in this manner.
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UL Flame Test Ratings and Results
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| Rating |
Required Test Results |
| 94 V-0 |
5 specimens with 10 flame
applications, with none exceeding 10 second flame or 50 second
total burn. |
| 94 V-1 |
5 specimens with 10 flame
applications, with none exceeding 30 second flame or 250 second
total burn. |
| 94 V-2 |
Same criteria as for 94 V-1, except
some dripping is allowed |
| 94 V-HB |
3 specimens none of which has
either a burn rate exceeding 3 inches per minute or ceases to
burn before reaching reference point. |
Silicone polymers yield low levels of smoke under normal service or
fire conditions.
At room temperature, silicone elastomers outperform TFE resin and
conventional fluoroelastomers on exposure to 10/8 roentgens.
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