Silicones/Silicone adhesives acid-curing type

One-part silicone systems are ready to use, require no mixing, present no pot-life problem, and are generally the least expensive. Conventional one-part adhesive/sealants are available with two different types of cure systems acid and nonacid cure. Both require moisture from the atmosphere to cure. The acid-curing type has the greatest unprimed adhesion and the longest shelf life. The nonacid-curing type is effective when the acetic acid released by the cure reaction may cause corrosion or be otherwise objectionable. ... 

Dow Coming Corp. offers an improved silicone adhesive/sealant for high-temperature use. This is a one-part, non-slumping paste that cures to a tough, mbber sohd at room temperature on exposure to water vapor in the air. This material is said to perform at temperatures ranging from -65 °C to 260°C for continuous operation, and to 316°C for intermittent exposure. This material will meet the requirements of M1L-A-46106A (2), Type 1 (see http //mil-spec-industries.com). The adhesive/sealant is acid-cured and acetic acid is evolved during cure. ... 

The temperatures at which different types of adhesives will survive in service for a period of 1 year will vary somewhat among particular materials, but the following general guidelines can be used. The upper limit for acrylates and cyanoacrylates is 80°C, whereas epoxides cured with polyamides have a service limit of 65° C. Epoxides cured with aliphatic amines have an upper limit of 100° C, whereas this limit is 150°C for those cured with acid anhydrides. The surface temperature is 200°C for silicones and 260°C for polyimides. Many of these adhesives can be exposed at higher temperature for shorter periods without detrimental effects. 

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