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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

Sealing involves filling gaps, accommodating the relative movement of substrates and excluding or containing the passage of substances through the surfaces, joints or openings in materials.

In sealing assemblies and joints, sealants need to deliver sufficient adhesion to the substrates and resistance to environmental conditions to remain bonded over the required life of an assembly.

When used between substrates with different thermal coefficients of expansion or differing elongation under stress, they need to have adequate flexibility. 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) and Viscosity.

Key Characteristics of Sealants

A 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 cure in the absence of air, unlike surface sealants that require air as part of the cure mechanism. Our range of Foam tapes and die cut shapes also have excellent sealing abilities.

Varying in viscosity, cure type and speed, mechanical, electrical and thermal properties, sealants can offer:

   -   Chemical and moisture resistance
   -   Elasticity – expanding or contracting with the substrates
   -   Rigidity – supporting requirements for low / no relative movement
   -   Low tensile modulus
   -   High shear strength
   -   High and low temperature resistance
   -   Low shrinkage
   -   Gap filling
   -   Single and two-component systems
   -   Transparent, opaque or coloured
   -   Improved IP ratings and ATEX level security

Types of Sealants Available

Valued for the diversity of their characteristics, Techsil’s sealants deliver unrivalled performance in protection against the ingress of elements while maintaining either a flexible or rigid seal as required. 

Techsil’s range of sealants includes:

   -   RTV Silicones
   -   Anaerobics
   -   Acrylics  
   -   Epoxies
   -   Hot Melts
   -   Polyurethanes
   -   MS Polymers
   -   Foam Tapes
   -   UV Curing Adhesives

 

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