‘Morning all! Wondering if anyone has attempted/tried High Heat Silicone to make gaskets, nrv or anything else sealant wise and what the outcome was. Been looking around and the popular material seems to be Viton sheets and/or o-rings. Thanks in advance!
Hi I used to work in the sealant industry and wonder which silicone and whether you’re going to use it cured or liquid. The high temperature silicones I am aware of get their temperature resistance by the addition of iron oxide pigments which is why they are red or black. They are acetoxy silicones meaning they evolve acetic acid when curing. This will attack/corrode metal parts such as brass or iron which would probably make them unsuitable.
@Firestarter it would be a sheet i came across on Amazon, quote: Made of high quality silicone rubber, hardness: 60+/-5 Shore AThese sheets are 305mm wide and available in 3mm, Resistant to ultra-violet light, ozone and weathering processing,pharma ceutical and cosmetic manufacturing area Continous use Temp: -60 To 200 Celsius Degrees , Excellent resistance to heat (dry air),Remains flexible at low temperatures of -40ºC.Keep constant even at high temperatures, Good electrical insulation Application： gaskets, pads, washers,leveling objects， floor cushioning, electric insulation, sound reduction. Opinion sir?
Probably ok but I would test a small sample in whichever fuel it might be exposed to for a week to make sure it didn’t swell or soften. I would not recommend for burner gaskets.
@Sleepnrkn It’s not merely the temperature tolerance that’s the issue for seals in stoves. Imperviousness to fuel (kerosene/gasoline/alcohol) is crucial, certainly, but silicone rubber is too soft - deforms to readily - for many applications, primarily fuel filler caps. The ‘popular’ materials as you call them are so for good reason, they do the job.
