Forsythe
Full Member
Instauratur Ruinae
Posts: 208
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Post by Forsythe on Dec 12, 2021 7:08:30 GMT -8
Credit to Norbert Senf of Heat-Kit and MHA-net.org for that helpful hint. I'm a big fan of the Masonry Heater Association's Membership who share so much useful knowledge on stuff like this, people like Norbert Senf, Alex Chernov, and Peter van den Berg (PeterBerg being of the admins here on the board, and creator of the Batch Box)
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Post by martyn on Dec 12, 2021 9:36:37 GMT -8
That is an interesting statement and from my perspective, not to far wrong. The clear silicone I buy from my local store is rated at 200c the fire stop silicone is rated at 270c The fire stop is black in colour and has a different viscosity being thiner and less sticky. However I have never tried the two types side by side, but in any case plain silicon does indeed still have a high temp rating.
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Forsythe
Full Member
Instauratur Ruinae
Posts: 208
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Post by Forsythe on Dec 13, 2021 7:30:49 GMT -8
There are different formulations of silicone, mostly depending on the metal catalyst used to cure it. The two most common types are tin-cure and platinum-cure.
It’s also interesting to note that I’ve seen that GE type 1 silicone promoted as the same thing used for aquarium caulk, which *must* be pure silicone to prevent toxicity to fish, which are very susceptible to it.
Apparently GE used to supply MDS sheets showing that the product was the same silicone formulation in each of those cases. IIRC, it’s a platinum silicone and the vinegar smell is due to the acetic acid used to keep it in extrudable form and prevent it from curing until the acetic acid off-gasses.
Other silicone types from GE often have either a different carrier / cure inhibitor — or they contain additives which lower the temperature rating while giving it some other property (like paintablility.)
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