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Sealing

Sealants are generally chosen for their ability to fill gaps, accommodate the relative movement of the substrates and exclude or contain other substances.

Electronic Sealing

Sealants are generally chosen for their ability to fill gaps, accommodate the relative movement of the substrates and exclude or contain other substances. Apart from an ability to bond or seal to a substrate, other properties should be considered during initial product selection, these choices include: Chemical Resistance, Modulus (resistance to stretch/recovery), Colour, Tensile Strength, Cure speed, Temperature range, Hardness (Rigid or Flexible), Viscosity.

sealant may be viscous material that has little or no flow characteristics and stay where they are applied or thin and runny so as to allow it to penetrate the substrate by means of capillary action. Anaerobic acrylic sealants generally referred to as impregnants are the most desirable as they are required to cure in the absence of air, unlike surface sealants that require air as part of the cure mechanism that changes state to become solid, once applied, and is used to prevent the penetration of air, gas, noise, dust, fire, smoke or liquid from one location through a barrier into another. Uses of sealants vary widely and sealants are used in many industries, for example, construction, automotive and aerospace industries.

The main difference between adhesives and sealants is that sealants typically have lower strength and better flexibility or elongation than adhesives. Since the main objective of a sealant is to seal assemblies and joints, sealants need to have sufficient adhesion to the substrates and resistance to environmental conditions to remain bonded over the required life of the assembly. When sealants are used between substrates having different thermal coefficients of expansion or differing elongation under stress, they need to have adequate flexibility. Sealants generally contain inert filler material and are usually formulated with an elastomer to give the required flexibility and elongation. They usually have a paste consistency to allow filling of gaps between substrates. Low shrinkage after application is often required. Many adhesive technologies can be formulated into sealants.

Techsil’s range of sealants offer unrivalled performance in protection against the ingress of elements whilst maintaining a flexible seal. Typically our RTV silicone sealants are used in sealing electronic assemblies to improve IP ratings or provide ATEX level security in explosion and/or high risk environments. The materials are supplied with a range of characteristics subject to the intended end use and application.

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