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. 901-5676
Mfr. Part No.740010645
MYR200.62
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
MYR97.87
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. 283-426
Mfr. Part No.158
MYR128.40
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. 901-5685
Mfr. Part No.740010660
MYR88.15
Each
units
Translucent Silicone Sealant Industrial 75 ml Tube -60°C No +250°C Silicone Elastomer High Temperature and Low Humidity, Tack-Free - 7 (3 mm) h Paste -
RS Stock No. 901-5688
Mfr. Part No.740010665
MYR213.34
Each
units
Translucent Silicone Sealant Industrial 310 ml Cartridge -60°C No +250°C Silicone Elastomer High Temperature and Low Humidity, Tack-Free - 7 (3 mm) h Paste -
RS Stock No. 901-5682
Mfr. Part No.740010655
MYR213.18
Each
units
Black Silicone Sealant Engineering 310 ml Cartridge -60°C No +300°C Elastomer High Temperature, Tack-Free - 7 (3 mm) h Paste Thixotropic
RS Stock No. 901-5694
Mfr. Part No.740010675
MYR160.69
Each
units
Translucent Silicone Sealant Atmospheric Moisture, Corrosion Sensitive Devices, Electrical & Electronic Applications, Small Circuits and Connectors 310 ml Cartridge -60°C No +200°C Alkoxy, Silicone Elastomer Low Odor, Non-Corrosive, Tack-Free - 36 (3 mm) h Paste Thixotropic
RS Stock No. 901-5679
Mfr. Part No.740010650
MYR245.71
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
MYR103.75
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. 901-5701
Mfr. Part No.740010685
MYR370.27
Each
units
Translucent Silicone Sealant Atmospheric Moisture, Corrosion Sensitive Devices, Electrical & Electronic Applications, Small Circuits and Connectors 310 ml Cartridge -62°C No +200°C Alkoxy, Silicone Elastomer High Strength, High Temperature Adhesive Paste, Non-Corrosive, Tack-Free - 72 (3 mm) h Paste -
RS Stock No. 901-5708
Mfr. Part No.740010695
MYR400.22
Each
units
Translucent Silicone Sealant Atmospheric Moisture, Corrosion Sensitive Devices, Electrical & Electronic Applications, Small Circuits and Connectors 310 ml Cartridge -62°C No +200°C Alkoxy, Silicone Elastomer Tack-Free - 72 (3 mm) h Liquid -
RS Stock No. 901-5705
Mfr. Part No.740010690
MYR246.84
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 -