Sealants

Sealants and sealant kits are widely used by both hobbyists and professionals for a broad range of protecting and waterproofing jobs. The best sealant type to use in a given scenario will depend on the surface materials and the location of the seal. There are many varieties of sealants, putties, and sealant remover kits on sale, with leading brands including Dow Corning and Bostik. While most tend to fall within one of a few basic categories - cement sealants, chemical sealants, or silicone sealants - there are also a number of sealants designed for more specialised purposes.

What’s the difference between sealant types?

Silicone sealants - among the most widely available sealant types, and ideal for a wide array of household, DIY and construction tasks.

Acrylic sealants - often a cheaper alternative to silicone for use on wood, aluminium, and UPVC, and can also be painted. They’re less flexible than most silicone versions, and more prone to eroding under certain application conditions.

Polyurethane foam sealants - extremely flexible/elastic and highly waterproof, ideal for sealing most metals and fibreglass.

Why is sealant modulus and cure type important?

High modulus sealants are less elastic but more hardwearing, and better suited to indoor applications as a kitchen or bathroom sealant (around baths, showers, sinks and worktops).

Low modulus sealants offer better flexibility and adhesion where slight movement of the joint may be a factor, but are less hardwearing overall. They’re generally best for outdoor and weather-resistant applications (perimeter seals and exterior UPVC).

Most sealants are available in one of two cure types - acetoxy and neutral.

  • High modulus sealants tend to be acetoxy cure, meaning they’ll cure faster and harder, and will emit a slight vinegar smell while doing so.
  • Low modulus sealants are often sold in natural cure variants, meaning they adhere better to a greater range of surfaces, cure slowly to a more elastic consistency, and give off little odour.

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Description Price Colour Sealant Type Application Package Size Package Type Minimum Operating Temperature Food Processing Safe Maximum Operating Temperature Chemical Type Physical Properties Trade Name Cure Time Product Form Elongation
RS Stock No. 665-8573
Mfr. Part No.1127070
BrandHenkel
kr 167,31
Each
Units
Black Silicone Sealant Sealing 100 ml Tube - No +200°C Acetoxy High Elongation Loctite 5940 - Paste -
RS Stock No. 341-0949
Mfr. Part No.91363
BrandBostik
kr 82,07
Each
Units
White Silicone Sealant Exterior, Sealing 300 ml Cartridge -50°C No +180°C Acetoxy, Elastomer Acetoxy Cure, High Modulus Bond-Flex 100HMA 24 (2 mm h @ 23 °C) Non-Slump Paste -
RS Stock No. 740-1362
Mfr. Part No.4068751
kr 111,43
Each
Units
Transparent Silicone Sealant Glass, Waterproof 310 ml Cartridge - No - - High Elasticity, Low Modulus, Low Odor, Non-Corrosive 799 1 (2.8 mm day@ 23 °C), 3 (4.3 mm days@ 23 °C) Paste -
RS Stock No. 160-8368
Mfr. Part No.Loctite 5368
BrandHenkel
kr 277,44
Each
Units
Black Silicone Sealant Bonding, Sealing 310 ml Cartridge -60°C No +250°C Silicone - Loctite Silicomet AS 312 - Paste -
RS Stock No. 341-0961
Mfr. Part No.91361
BrandBostik
kr 88,07
Each
Units
Transparent Silicone Sealant Exterior, Sealing 300 ml Cartridge -50°C No +180°C Acetoxy, Elastomer Acetoxy Cure, High Modulus Bond-Flex 100HMA 24 (2 mm h @ 23 °C) Non-Slump Paste -
RS Stock No. 192-1526
Mfr. Part No.5313 20MM
Brand3M
kr 1 121,17
Each
Units
Black Sealant Strip - - - -40°C - +100°C - - Scotch-Weld™ 5313 - - 1.8
RS Stock No. 423-6938
Mfr. Part No.6011030
BrandGeocel
kr 116,76
Each
Units
Red Silicone Sealant Sealing 310 ml Cartridge -40°C No +250°C Acetoxy - Plumba Flue - Putty -
RS Stock No. 208-5012
Mfr. Part No.Alpha 007
kr 153,96
Each
Units
Black Adhesive Sealant Sealing 300 ml Cartridge +5°C - - - - Ultrabond 007 - Liquid -
RS Stock No. 208-5013
Mfr. Part No.Alpha 124
kr 34,99
Each
Units
Clear Adhesive Sealant Sealing 75 ml Cartridge +5°C - - - - Alpha 124 - Liquid -
RS Stock No. 859-7971
Mfr. Part No.1911295
kr 40,056
Each (In a Box of 50)
Units
- - - - - - - - - - - - - -
RS Stock No. 512-783
BrandRS PRO
kr 115,89
Each
Units
Black Silicone Sealant Jointing 310 ml Cartridge -50°C No +100°C Elastomer Low Modulus, Neutral Cure - 7 (23 °C) days Paste -