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 Chemical Composition
RS Stock No. 341-0961
Mfr. Part No.91361
BrandBostik
TWD299.00
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. 555-588
BrandRS PRO
TWD214.00
Each
units
Transparent - Electrical 100 g Tube -60°C No +180°C Acetoxy, Elastomer Acetoxy Cure - 7 (23 °C) days Paste -
RS Stock No. 550-230
BrandRS PRO
TWD382.00
Each
units
Transparent Silicone Sealant Electrical 310 ml Cartridge -60°C No +180°C Acetoxy, Elastomer Acetoxy Cure - 7 (23 °C) days Paste -
RS Stock No. 423-6758
Mfr. Part No.229293
BrandLoctite
TWD514.00
Each
units
Transparent Silicone Sealant Sealing 100 ml Tube -60°C No +250°C Acetoxy High Elongation, High Tensile Strength, Shore Hardness Loctite 595 - Paste -
RS Stock No. 693-264
Mfr. Part No.2942127
TWD443.00
Each
units
White Silicone Sealant Firestop 380 ml Cartridge - No - - - Firestop 700 - Paste -
RS Stock No. 258-5979
Mfr. Part No.LOCTITE® SI 5368
BrandLoctite
TWD624.00
Each
units
Black Silicone Sealant Bonding 310 ml Cartridge -60°C No +250°C Acetoxy - Loctite 5368 5 min Paste Silicone
RS Stock No. 494-102
BrandRS PRO
TWD575.00
Each
units
White Silicone Sealant Copper, Semiconductor Junction Protection 310 ml Cartridge -40°C No +150°C Elastomer Neutral Cure, Non-Corrosive - 7 (23 °C) days Paste Stearic Acid
RS Stock No. 512-799
BrandRS PRO
TWD328.00
Each
units
White Silicone Sealant Jointing 310 ml Cartridge -50°C No +100°C Elastomer Low Modulus, Neutral Cure - 7 (23 °C) days Paste -
RS Stock No. 459-0232
Mfr. Part No.6011088
TWD353.00
Each
units
Transparent Silicone Sealant Refrigeration Units 310 ml Cartridge -50°C Yes +150°C Acetoxy High Modulus 786 24 (2.5 mm) h Paste -
RS Stock No. 459-0210
Mfr. Part No.6011086
TWD341.00
Each
units
Transparent Silicone Sealant Glass, Sealing, Waterproof 310 ml Cartridge - No - Acetoxy High Elasticity 781 1 (3 mm day@ 23 °C), 3 (5 mm days@ 23 °C) Paste -
RS Stock No. 459-0226
Mfr. Part No.6011087
TWD1,324.00
Each
units
White Silicone Sealant Refrigeration Units 310 ml Cartridge -50°C No +150°C Acetoxy High Modulus 786 24 (2.5 mm) h Paste -
RS Stock No. 561-176
Mfr. Part No.2939126
TWD207.00
Each
units
Transparent - Insulation, Pipe Sealing, Sealing, Trunking Sealing 78 g Injector -40°C No +150°C Acetoxy Non-Flammable Geobond Marine 24 (3 mm h@ 23 °C) Paste -
RS Stock No. 561-160
Mfr. Part No.2939193
TWD313.00
Each
units
White Silicone Sealant Sealing 310 ml Cartridge -40°C No +150°C Acetoxy Non-Flammable Geobond Marine 24 (3 mm h @ 23 °C) Paste -
RS Stock No. 113-008
Mfr. Part No.6011048
TWD125.00
Each
units
Transparent - Exterior, Sealing 50 ml Tube +5°C No +40°C Elastomer Fungus Resistant, Mildew Resistant SRS - Paste -
RS Stock No. 175-6631
Mfr. Part No.5145
BrandHenkel
TWD1,032.00
Each
units
Transparent Silicone Sealant Bonding, Sealing 40 g Tube - No +250°C Alkoxy Non-Corrosive - - Liquid -
RS Stock No. 705-9030
Mfr. Part No.3307271
TWD383.00
Each
units
White Silicone Sealant Low Temperature, Refrigeration Units 310 ml Cartridge - No - Alkoxy High Elasticity, Low Modulus, Low Odor 798 1 (2 mm day@ 23 °C), 3 (4 mm days@ 23 °C) Paste -
RS Stock No. 423-6938
Mfr. Part No.6011030
BrandGeocel
TWD333.00
Each
units
Red Silicone Sealant Sealing 310 ml Cartridge -40°C No +250°C Acetoxy - Plumba Flue - Putty -
RS Stock No. 561-132
Mfr. Part No.6001282
BrandGeocel
TWD512.00
Each
units
White - Pipe Sealing, Plastic, Waterproof 290 ml Cartridge -40°C No +150°C Hybrid Non-Flammable Geobond Marine 24 (3 mm h@ 23 °C) Paste -
RS Stock No. 512-783
BrandRS PRO
TWD328.00
Each
units
Black Silicone Sealant Jointing 310 ml Cartridge -50°C No +100°C Elastomer Low Modulus, Neutral Cure - 7 (23 °C) days Paste -
RS Stock No. 113-092
Mfr. Part No.6011017
BrandGeocel
TWD321.00
Each
units
Black Silicone Sealant Glass, Sealing 310 ml Cartridge -50°C No +150°C - Low Modulus Geocel 791 7 → 14 days Paste -