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. 423-6786
Mfr. Part No.229227
BrandLoctite
R 416.04
Each
units
Black Silicone Sealant Sealing 100 ml Tube -60°C No +250°C Acetoxy High Elongation, High Tensile Strength, Shore Hardness Loctite 5940 - Paste -
RS stock no. 550-230
BrandRS PRO
R 255.72
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. 494-102
BrandRS PRO
R 394.05
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. 555-588
BrandRS PRO
R 127.57
Each
units
Transparent Silicone Sealant Electrical 100 g Tube -60°C No +180°C Acetoxy, Elastomer Acetoxy Cure - 7 (23 °C) days Paste -
RS stock no. 423-6938
Mfr. Part No.6011030
BrandGeocel
R 235.98
Each
units
Red Silicone Sealant Sealing 310 ml Cartridge -40°C No +250°C Acetoxy - Plumba Flue - Putty -
RS stock no. 423-6758
Mfr. Part No.229293
BrandLoctite
R 395.35
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. 512-799
BrandRS PRO
R 267.15
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. 740-1362
Mfr. Part No.4068751
R 301.27
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. 283-426
Mfr. Part No.158
R 303.18
Each
units
Black Silicone Sealant Bonding, Sealing 75 ml Tube -60°C No +300°C Elastomer High Temperature Silcoset 158 7 (25 °C) h Paste -
RS stock no. 901-5679
Mfr. Part No.740010650
R 869.51
Each
units
White Silicone Sealant Engineering 310 ml Cartridge -60°C No +300°C Elastomer High Temperature, Tack-Free - <12 (3 mm) h Liquid -
RS stock no. 901-5660
Mfr. Part No.740010635
R 411.12
Each
units
White Silicone Sealant Engineering 75 ml Tube -60°C No +300°C Elastomer High Temperature, Tack-Free - <12 (3 mm) h Liquid -
RS stock no. 341-0955
Mfr. Part No.91360
BrandBostik
R 209.02
Each
units
Black 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. 459-0226
Mfr. Part No.6011087
R 328.01
Each
units
White 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. 113-092
Mfr. Part No.6011017
BrandGeocel
R 258.47
Each
units
Black Silicone Sealant Glass, Sealing 310 ml Cartridge -50°C No +150°C - Low Modulus Geocel 791 7 → 14 days Paste -
RS stock no. 705-9030
Mfr. Part No.3307271
R 300.50
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. 901-5676
Mfr. Part No.740010645
R 808.39
Each
units
White Silicone Sealant Industrial 310 ml Cartridge -60°C No +300°C Silicone Elastomer High Temperature and Low Humidity, Tack-Free - 7 (3 mm) h Paste -
RS stock no. 901-5672
Mfr. Part No.740010640
R 376.41
Each
units
White Silicone Sealant Industrial 75 ml Tube -60°C No +300°C Silicone Elastomer High Temperature and Low Humidity, Tack-Free - 7 (3 mm) h Paste -
RS stock no. 423-6988
Mfr. Part No.6011050
BrandGeocel
R 274.80
Each
units
White Silicone Sealant Bath & Kitchen Sealing, Sanitary Fittings 310 ml Cartridge +5°C - +40°C - - 785 1 h Paste -
RS stock no. 901-5705
Mfr. Part No.740010690
R 1,152.67
Each
units
Grey Silicone Sealant Atmospheric Moisture, Corrosion Sensitive Devices, Electrical & Electronic Applications, Small Circuits and Connectors 310 ml Cartridge -62°C No + 316°C Alkoxy, Silicone Elastomer High Strength, High Temperature Adhesive Paste, Non-Corrosive, Tack-Free - 72 (3 mm) h Paste -
RS stock no. 293-467
Mfr. Part No.31644-AA
BrandAmbersil
R 106.16
Each
units
Transparent Silicone Sealant Sealing 75 ml Tube -60°C No +205°C Acetoxy High Modulus 5005A 7 (3 mm) days Paste -