Heat Proof Silicone Adhesive

When an application requires an adhesive that withstands extreme temperatures, heat proof silicone is the best option. These industrial-grade adhesives have numerous benefits that make them an excellent choice for a variety of projects.

They are non-corrosive, chemical resistant and insulative. They also feature good shear and tensile strength.

High Temperature Resistance

Unlike standard sealants, heat resistant silicones are specially formulated to deal with extreme temperatures and can in some cases stand direct exposure to flames. They also dries slowly to produce an extremely tough, long-lasting adhesive.

They can be used to glue and seal components that will be exposed to high temperatures in a variety of industries, including manufacturing, automotive and electronics. They’re also ideal for use on construction and renovation projects. They bond well to concrete, ferrous and non-ferrous metals, masonry, gypsum plasterboards, ceramic tiles, wood, clinker, enameled surfaces, glass, expanded polystyrene (EPS) and other plastics. Depending on your application, you can choose from acid-cure or neutral curing heat proof silicone adhesive silicones. Acid-curing silicones work best on non-porous surfaces like glass and glazed tile but can corrode some types of metal, while neutral-curing products are suitable for both porous and non-porous materials.

Some types of heat proof silicone can withstand very high temperatures when cured, often up to 600 degrees Fahrenheit. They’re designed to withstand high levels of vibration, ageing and shock as well.

A good choice is MARS HVAC/R high temperature red silicone, which can withstand up to 90 degrees Celsius for continuous operation and 200 degrees Celsius for short periods of time. It’s free of solvents, acetoxy curing and a grey colour. It’s a good choice for sealing or bonding parts that will be powder coated as it’s highly durable and resists chemicals.

Moisture Resistance

Silicone adhesives withstand high temperatures and have good moisture resistance. They also resist tearing, abrasion and vibrations, making them ideal for areas that will expand and contract over time. They are also chemical resistant and won’t be affected by most cleaners and solvents.

There are many different types of silicone adhesives. You should choose the one that’s right for your needs, depending on what materials you’re working with and how hot they will get. Most silicones can withstand high temperatures and have good elasticity, while others are better suited to lower temperatures. Some types of silicone are made for specific materials, like metals, while others are formulated to work with glass, rubber and plastics.

If you’re working with metal, a vise or clamp is essential to keep the pieces together while the adhesive dries. Make sure that the pressure is as tight as possible, which will help ensure that the bond is as strong as possible. It’s important to give the adhesive a lot of time to dry, as well. If you rush it, it may not cure properly and could end up weakening the seal over time.

RTV Silicone Heat Resistant is a professional sealant that is heat proof silicone adhesive used to glue and bond a variety of materials and surfaces. It is designed to withstand ongoing exposure to 90°C and short-term spikes of up to 130°C, and it can be applied indoors or outdoors. It is resistant to fresh and salt water, UV radiation, and most chemicals.

Chemical Resistance

Unlike some other adhesives, silicone stays stable and flexible even when exposed to extreme heat. Its chemical makeup also protects it from moisture, weathering and chemicals. It can resist a wide range of temperatures from -60°C to +230°C, though specialist types can handle even higher temps.

Different grades of silicone have different temperature resistances. You can choose the right one for your needs based on what type of surface you’re bonding, the temperature range you’ll be using the sealant in, how long you’ll need it to last and whether you want the adhesive to keep its flexibility at low temperatures or be a bit stiffer at high temperatures.

For example, a great option for high temperature applications is MasterSil 711. It’s non-corrosive and resistant to harsh environments and chemicals. There’s also MasterSil 151Med which is optically clear, USP Class VI certified for medical applications and meets FDA standards.

Another good choice is Flex 310 M Classic from Weicon, which can be used indoors or outdoors and is resistant to fresh water, salt water and most chemicals. It’s easy to clean, sand and paint over once cured and can be used on a variety of surfaces including metal, glass, ceramic, most types of plastic, brick and slate. It withstands ongoing exposure to 90°C continuous and short-term spikes to 130°C.

Electrical Conductivity

Adding graphite fillers to silicone adhesives gives them electrical conductivity that helps dissipate heat. This improves thermal management in electronics by allowing the adhesive to transfer heat away from the substrate, especially when assembled under stress. It also reduces EMI interference and shields against static electricity build-up. Henkel offers a range of electrically conductive silicone adhesives with different conductivity levels and a variety of viscosities and pot life to match your application.

Generally used in household, renovation and construction applications, these types of high-temperature silicones adhere well to glass, ceramic, clinker, metals, aerated concrete, gypsum plasterboards and impregnated woods. They can be used to seal joints and seams around stoves, fireplaces and chimneys, ductwork and furnace doors, as well as gluing packings or tapes to surfaces that require high-temperature resistance.

Often used in the automotive industry, these silicones can resist temperatures up to 160°C, while maintaining a high level of flexibility and a good resistance to chemicals and weathering. Some are designed to bond and seal surfaces with a low surface energy, such as flanges or gaskets that will not be subjected to liquid solder. They can also be used to glue and seal radiator and transmission components, seal hoses and pipework for hot water or air and replace gaskets on pumps and engine blocks. Some can even be cured under pressure.

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