Low Temperature Sealants

Low temperature sealants are essential in many industries where maintaining adhesion and sealing properties in cold environments is critical. This blog post explores the features and applications of low temperature sealants, with a particular focus on silicone-based options and a spotlight on notable products like Dowsil 7091 Silicone Adhesive Sealant.

Adhesives vs. Sealants

Before exploring low temperature sealants, it is important to understand the difference between adhesives and sealants. Adhesives are substances used to bond two surfaces together in a permanent manner, providing structural strength to the joint. Sealants, on the other hand, provide a lower strength and are mainly used to fill gaps and prevent the passage of liquids, gases, or other materials through joints or openings. While adhesives contribute to the mechanical stability of a structure, sealants ensure its impermeability and longevity, especially in challenging conditions.

Features of Low Temperature Sealants

Low temperature sealants are designed to perform effectively in environments where temperatures drop significantly below freezing. These sealants maintain their elasticity and adhesion properties, ensuring durable sealing even in cold conditions. They are crucial in industries where materials must endure extreme cold and/or temperature fluctuations without compromising structural integrity. These include the pharmaceutical, medical and food industry (for sealing cold storage facilities), ventilation and air conditioning systems, transportation (for refrigerated vehicles and containers), and any outdoor structure or equipment that is exposed to frigid conditions.

Silicone Low Temperature Sealants

Silicone low temperature sealants stand out thanks to their peculiar characteristics, which include excellent flexibility, durability, and resistance to weathering, ozone, and UV radiation. Their ability to maintain performance at both high and low temperatures makes them ideal for various applications. These sealants are typically used in construction, automotive, aerospace, marine industries and more.

Key features of silicone low temperature sealants include:

• Temperature Range: Silicone sealants can typically withstand temperatures from -40°C to 180°C, making them suitable for environments with significant thermal variations.
  
• Flexibility: They remain flexible even at low temperatures, preventing cracks and ensuring long-term adhesion.
  
• Durability: Resistant to harsh weather conditions, UV radiation, and ozone, these sealants provide lasting performance.
  
• Versatility: Silicone low temperature sealants adhere to a wide range of materials, including metals, glass, ceramics, and certain plastics.
   
  

Spotlight on Dowsil 7091 and Loctite 567

Dowsil 7091 Silicone Adhesive Sealant is a high-performance product designed for robust yet flexible bonding, particularly effective with materials that have different thermal expansion rates, like glass and metal. It offers excellent adhesion to a variety of surfaces including steel, aluminium, ceramic, glass, and certain engineering plastics. With a temperature range of -40°C to 180°C, Dowsil 7091 remains stable and flexible even in cold environments.

Loctite 567 Thread Sealant is a low-strength, methacrylate-based paste used for the locking and sealing of metal tapered threads and fittings. It performs well in temperatures ranging from -55°C to 150°C, making it suitable for extremely cold conditions. Both products provide reliable sealing and bonding solutions in environments with significant temperature fluctuations.


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