Guide to Using High-Temperature Silicone Sealants
High-temperature silicone sealants can withstand temperatures as high as 600 degrees Fahrenheit and are resistant to aging, vibrations and shock. They are specially formulated to seal and encapsulate heating elements and industrial seals. High-temperature silicone is designed to withstand high temperatures when cured, typically up to 500°F, but some formulas are rated up to 572°F.Get more news about
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High temperature silicone sealants with an NSF certification are used in foodservice applications or where food contact may occur and high-temperature performance is needed. This type of high-temperature silicone is formulated to perform at up to 600 degrees Fahrenheit during intermittent exposure. A good high-temperature silicone will meet MIL-46106 Type 1 FDA and USDA requirements.
Silicone sealant is a liquid form of adhesive, though it looks, feels and acts like a gel. It is formed with a different type of chemical makeup compared to other, more organic polymer-based adhesives. Unlike those other adhesives, silicone is resistant to chemicals, moisture and weathering. It also keeps elasticity and stability in both high- and low-temperature conditions.
Silicone sealants require curing, which means they must dry. The temperature to cure the silicone can be anywhere between 50t and 100 degrees Fahrenheit, and there needs to be between 5 and 95 percent humidity for the silicone to properly cure. It can take as little as 24 hours to cure, but a thick application of sealant can take longer, sometimes up to 48 hours.
Silicone sealants can emit a strong and long-lasting odor and can take a considerable time to be fully cured., Their benefit is that they can be used in glass assemblies. Pure silicone is not paintable, but it will stay flexible at a wide range of temperatures, is waterproof, bonds well and won’t support mildew growth.
Industrial silicone is best used for sealing and bonding applications. Silicone has formulations that include electrical grade, low-odor, paintable and high-temperature. Silicone is used in a variety of industries including plumbing, refrigeration, HVAC, commercial and residential.
High modulus, low modulus, neutral cure and acetoxy cure are the most commonly used silicone types. Low modulus will need just a low force to stretch it and will be more elastic, whereas a high modulus is more rigid. Choose the type of modulus based on how much movement you will need.
Acetoxy silicones release a vinegar-smelling acetic acid as they cure, but they cure quicker. This type of silicone sealant has poor adhesion and doesn’t stick well to plastics, glass or aluminium. Neutral alkoxy sealants release alcohol as they cure and adhere to a great number of different materials. They take longer to cure.
Acid-cure silicones work best on non-porous surfaces like glass and glazed tile, but they can corrode metal and etch some plastics, while neutral-cure silicones are a better choice if you are using metal or wood.
