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Silicone adhesives and silicone sealants are based on tough silicone elastomeric technology. Silicone adhesives have a high degree of flexibility and very high temperature resistance (up to 600 degrees F), when compared to other adhesives. While silicone adhesives and silicone sealants have a high degree of flexibility, they lack the strength of other epoxy or acrylic resins. Silicone adhesives and silicone sealants are available in two-component addition or condensation curing systems or single component RTV forms. Room temperature vulcanizing (RTV) forms cure through reaction with moisture in the air and give off aciatic acid fumes or other by-product vapors during curing.

Silicone adhesives and silicone sealants are available in a number of technologies (or cure systems). These technologies include pressure sensitive, radiation cured, moisture cured, thermoset and RTV.

Pressure sensitive silicone adhesives adhere to most surfaces with very slight pressure and they retain their tackiness. They form viscoelastic bonds that are aggressively and permanently tacky, and adhere without the need of more than finger or hand pressure. UV or radiation cured silicone adhesives and silicone sealants use ultraviolet light, visible light or electron bean irradiation to initiate curing, which allows a permanent bond without heating or excessive heat generation. One disadvantage of UV curing adhesives is the requirement that one substrate is UV transparent. Some UV resin systems employ a secondary curing mechanism to complete curing of adhesive regions shielded from the UV light. EB curable adhesives use electron beam radiation to cure or initiate curing. The electron beam can penetrate through material that is opaque to UV light. Reactive moisture cured resins are single component adhesives are applied like hot melt adhesives until the resin reacts with moisture to crosslink and polymerize resulting in a cured material. Certain silicone adhesives and cyanoacrylates also use a reaction with moisture or water to cure the adhesive or sealant. Thermoset silicone adhesives and silicone sealants are crosslinked polymeric resins cured using heat or heat and pressure. Cured thermoset resins do not melt and flow when heated, but they may soften. Vulcanization is a thermosetting reaction involving the use of heat and/or pressure in conjunction with a vulcanizing agent, resulting in greatly increased strength, stability and elasticity in rubber-like materials. RTV silicone rubbers are room temperature vulcanizing materials. The vulcanizing agent is a crosslinking compound or catalyst. Sulfur is the traditional vulcanizing agent used with natural rubber. Silicones use moisture, acetic acid and other compounds as curing agents.

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Products & Services Related to Silicone Adhesives and Sealants

Anaerobic Adhesives and Anaerobic Sealants

Anaerobic adhesives and sealants cure in the absence of air or oxygen.

Cyanoacrylate Adhesives

Cyanoacrylate adhesives are one-part acrylate adhesives that cure instantly on contact with mated surfaces through a reaction with surface moisture. Cyanoacrylates are often called super glues.

Hot Melt Adhesives

Hot melt adhesives are solvent-free chemical compounds that are used to join materials. They can be repeatedly softened by heat and hardened or set by cooling, allowing parts to be removed or repositioned during assembly.

Plastic and Rubber Balls

Plastic and rubber balls are sphere shapes that are used as check or ball valves, bearings, and in other applications.

Plastics and Plastic Materials

Plastics and plastic materials are organic, synthetic or processed polymers that are supplied as raw materials or stock shapes. They typically consist of thermoplastic or thermosetting resins and can be made into many forms.

Rubber Adhesives and Sealants

Rubber adhesives and rubber sealants are highly flexible, natural or synthetic materials that are used to join components or fill gaps between seams or on surfaces.

Thermal Compounds and Thermal Interface Materials

Thermal compounds and thermal interface materials form a thermally conductive layer on a substrate, between components or within a finished product.

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Chapter 13 - References

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Engineering Web: Silicone Adhesives and Sealants

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RTV Silicone Sealants, High Temperature Adhesives and Sealants... RTV silicone sealants, high temperature adhesives and sealants from Intek Adhesives a specialist uk industrial supplier
Adhesives on ThomasNet.com Adhesives Dispensers Epoxy Adhesives Laminating Adhesives Plastic Adhesives Automotive Adhesives Silicone Adhesives Custom Adhesives Structural
Aerospace Adhesives on ThomasNet.com Ellsworth Adhesives - Multiple Locations Distributor, Manufacturer, Custom Manufacturer http://www.ellsworth.com/adhesives.html?tab=Products Company

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Part Numbers for Silicone Adhesives and Sealants

Part #	Distributor	Manufacturer	Product Category	Description
59530	Newark	LOCTITE	All Supplier Direct Ship	PERMATEX RTV SILICONE ADHESIVE SEALANT, COLOR: CLEAR, TEMPERATURE RANGE: -80-450 DEGREE FAHRENHEIT, CAPACITY: 3 OZ, FEATURES: PERFECT FOR SECURING SPEAKERS TO CABINETS, SEALS, BONDS, REPAIRS, MENDS AND SECURES GLASS, METAL, PLASTICS
59330	Newark	LOCTITE	All Supplier Direct Ship	Permatex RTV Silicone Adhesive Sealant, Color: Black, Temperature Range: -80-450 degree fahrenheit, Capacity: 3 oz, Features: Perfect for securing speakers to cabinets, seals, bonds, repairs, mends and secures glass, metal, plastics

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