Ardex ST Silicone Sealant – 310ml x 12 (colour options available)

£150.47 exl. VAT

Per Unit


SKU 113111415535769370 Category

Neutral Cure Elastic Silicone Sealant – Carton of 12 x 310ml.

  • Available in 6 colours
  • Suitable for internal and external use
  • Minimises discolouration
  • Suitable for joints in natural stone
  • Excellent resistance to weather and commonly used cleaning chemicals


Ardex ST – Neutral Cure Elastic Silicone Sealant

Ardex ST – Neutral Cure Elastic Silicone Sealant. Ardex ST is a neutral cure elastic silicone sealant that minimises the risk of discolouration in porous materials, making it suitable for use with most finishes including moisture sensitive natural stones. After curing, Ardex ST is resistant to commonly used cleaners, disinfectants and UV exposure, and its antifungal properties inhibit the growth of fungi and moulds. It is easy to apply and smooth and, due to its high elasticity, it can accommodate movement of up to 20% of the applied width. It is available in Transparent and 13 colours designed to match the most popular Ardex-Flex Flexible Tile Grout colours.

Ardex ST – Neutral Cure Uses

Ardex ST can be used for the sealing of movement, corner and connecting joints in internal and external locations including bathrooms, showers and living areas. It is suitable for use with most surface finishes including natural stones, and has excellent adhesion to glazed and unglazed tiles, enamel, glass, acrylic, anodised aluminium, plastics, laminated kitchen work boards, solvent free acrylic varnished surfaces and wood.

NOTE: Apply Ardex cautiously on natural stone, avoiding getting any silicone onto the tile surface. If this should happen, remove immediately and do not use detergents. Fresh spills can be removed with a thinner. After curing, it is only possible to remove the sealant by mechanical means if applied to a suitable substrate. Due to the variable nature of some natural stone and absorbent surfaces, we recommend that a test application is carried out before commencing work, or contact ARDEX Technical Services for further advice.

Ardex ST is waterproof and prevents water penetrating through the silicone joint. Where moisture sensitive backgrounds in wet areas are being tiled, Ardex WPC Waterproof Coating should be used to prevent moisture ingress through tile grout joints.

Ardex ST is not suitable for use in permanently submerged locations such as swimming pools.
Ardex ST should not be used on the following substrates: bitumen and bituminous materials, butyl, EPDM, rubber, polyethylene, neoprene, tar and Teflon. Ardex ST does not adhere to polyethylene and Teflon. On the other substrates discoloration may occur. The surface of natural stones and open porous tiles should be protected with masking tape to prevent the sealant entering pores in the surface which could lead to discolouration.

Ardex ST is suitable for corner and edge joints on floors, however it is not suitable for floors with high mechanical loads.


Not quite what you’re looking for? Click here to browse more of our Ardex range.

Want to see how Ardex ST and other Ardex products have been used? Click here to view a range of Ardex Projects.

Additional information


Brilliant White, Spring Jasmine, Floating Driftwood, Dove Grey, Stormy Mist, Innocent Black, Ocean Grey, Cast Iron, Silver Shimmer, Slate Grey, Natural Almond, Antique Ivory, Coffee Bean, Fresh Snowdrop



For more than 60 years, ARDEX has been a quality leader for the flooring and tiling industries, the brand of choice for installers and distributors. ARDEX today is still an independent family-owned business. This means that in our permanent efforts to achieve market-shaping innovations, we have been able to retain our most important tradition: uncompromising quality. This is something we guarantee by applying the latest rigidly enforced quality assurance procedures, making it no coincidence that they are regarded as a premium partner of the construction industry. Strong internal growth and intelligent acquisitions in foreign markets have put the Group on the map with 53 subsidiaries and 3,000 employees on all continents. With its 14 major brands, the ARDEX Group generated a worldwide annual turnover in excess of 770 million euros in 2018. This marks an important milestone and they are becoming one of the world’s leading suppliers of high-quality specialist building materials.

Technical Information