Soudal Silirub+ ® S8800 - Premium Sanitary Silicone for Natural Stone

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Soudal Silirub+ ® S8800 - Premium Sanitary Silicone for Natural Stone

Soudal | Silicone Sealant

Soudal Silirub+ ® S8800 is a Premium Quality, Non-Staining, Low Modulus Neutral Cure Silicone Sealant which contains powerful anti-fungal agents to restrict mould growth. Specifically designed for use on Natural Stone (i.e Granite, Marble etc.)

Soudal Silirub+ ® S8800 is extra thick-bodied with excellent toolability, highly elastic and virtually odourless.

Soudal Silirub+ ® S8800 has primerless adhesion on all common construction materials and is resistant to UV, rain, snow, ozone and many chemicals. High and low temperature resistance. Gloss type finish on all colours.

Benefits & Features

Soudal Silirub+ ® S8800 - Premium Sanitary Silicone for Natural Stone

  • Low Modulus Neutral Cure Silicone

  • No Staining on Porous Surfaces (i.e Marble, Granite and Other Natural Stones)

  • Very Easy to Apply

  • No Filamenting - Can be Shaped and Finished very well

  • Colourfast and UV Resistant

  • Weatherproof

  • Permanently Elastic After Curing

  • Corrosion Free

  • Impervious to Mould - Contains ZnP (Biocide with Fungicidal Action)

  • Excellent Adhesion on Glass, Ceramic, Enamel and Galvanised Metals

  • 25% Maximum Allowed Distortion

  • Solvent, Halogen, Acid and Isocyanate Free.

  • Resistant Against Usual Household Cleaners and Disinfectants

  • Conforms to ISO 11600 F&G 25 LM

Staining Effects on Natural Stone:

Silicone Sealants are made from several raw materials of which Silicone Polymer and Silicone Oil are the two major components.

When a standard silicone is used on Natural Stone, the silicone oil will be released into the Natural Stone causing permanent migratory staining and damage to the stone.

With a specialist Natural Stone compatible silicone (such as this product), the silicone oil is integrated within the polymer, which means it cannot migrate into the stone.

Only Specialist non-staining sealants can be used on Natural Stone without the risk of expensive, long-term damage to the surface.

'Silirub+® S8800' is a Specialist Stone Sealant, and as such is guaranteed not to cause staining.


Typical Applications:

  • Sealing of Joints in all Sanitary Applications such as Bathrooms and Kitchens

  • Sealing of Expansion Joints in Construction.

  • Sealing of Natural Stone Cladding Façades.

  • Sealing in Areas Prone to High Humidity

Surface Preparation:

Surfaces should be clean, dry, free of dust and grease.

Porous surfaces in water loaded applications should be primed with Soudal Primer 150. No primer needed for non-porous substrates.

There is no adhesion on PE, PP, PTFE (Teflon®) and bituminous substrates. We recommend a preliminary compatibility test.

Application Method:

  • Application Method: With a manual or pneumatic caulking gun.

  • Cleaning: Clean with a Surface Cleaner immediately after use.

  • Finishing: With a soapy solution or Soudal Finishing Solution before skinning.

  • Repair: With the same material

Joint Dimensions:

  • Minimum Width for Joints: 5 mm

  • Maximum Width for Joints: 30 mm

  • Minimum Depth for Joints: 5 mm

  • Recommendation Sealing Jobs: Joint Width = 2 x Joint Depth.


  • Contact with bitumen, tar or other plasticizer releasing materials such as EPDM, neoprene, butyl, etc. is to be avoided since it can give rise to discolouration and loss of adhesion.

  • The sanitary formula should not replace regular cleaning of the joint. Excessive contamination, deposits or soap remainigs will stimulate the development of fungi.

  • A total absence of UV can cause a colour change of the sealant.

  • In an acid environment or in a dark room, white silicone can slightly turn yellow. Under the influence of sunlight it will turn back to its initial colour.

  • When finished with a finishing solution or soapy solution, make sure that the surfaces are not touched by this solution. This will cause the sealant not to adhere to that surface. Therefore we recommend to only dip the finishing tool in this solution.

  • We strongly recommend not to apply the product in full sunlight as it will dry very fast.

  • Do not use in applications where continuous water immersion is possible.

  • Do not use on polycarbonate. Use Silirub® AL2T instead.

Colour Options

Data Sheets

Technical Data Sheet

Declaration of Performance (DoP)

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£4.40 £3.69 ex. VAT | £5.28 £4.43 inc. VAT

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