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PENOSIL No Mould is a silicone sealant for clean and healthy bathroom.


Fast polymerisation and total adhesion to most surfaces allows Penosil No Mould silicone sealant to be exposed to shower water in just 30 minutes. In addition to providing 100% water resistance, the bond and colour will remain unaffected.


Mould is not only unsightly but unhygienic too. The MOULD-FREE additive in No Mould silicone protects it from mould and, as long as it is regularly cleaned, is applied correctly and the room
has proper ventilation, will protect it for a minimum of 10 years. According to European Standard EN ISO 846, No Mould silicone achieves sanitary class XS1, the highest possible.


Flexibility is important because silicone can undergo extreme expansion and contraction with temperature fluctuation. Because No Mould silicone can expand by up to 25%, the sealant can
move with the joint, helping keep it from being pulled away from the surface. No Mould silicone’s flexibility remains unchanged during its lifetime, no matter what conditions it is used in.

Also available as a renovation kit.


  • Transparent
  • White


  • Indoor & outdoor
  • 100% waterproof
  • No color change

Adheres to:

  • Ceramics
  • Glass
  • Wood
  • Aluminium
  • Glazed surfaces
  • Non-porous surfaces
  • Cast iron

Application areas

  • Sealing and waterproofing of: bathroom floor and wall joints; shower trays, sinks, washbasins and WCs.
• Permanently flexible, even at low temperatures • Crack-proof. Silicone doesn’t harden and stays flexible when exposed to extreme heat or the effect of UV • Chemical-resistant. Silicones are resistant to all cleaners and other detergents used in the home • Waterproof. Silicones can’t be washed away by rain or shower water, so their adhesion is maintained

How to use

How to use


10 Year minimum life means more than that! It is:

  • a reliable product;
  • sustainable and durable;
  • a product with long-lasting properties: permanently flexible,
    water and UV-resistant, crack and freeze-proof.

It also means:

  • YOU SAVE MONEY. Without the need to repair sealed areas, you save
    the cost of replacement materials and labour as well as time;
  • YOU HELP PRESERVE THE ENVIRONMENT. With less products used
    over a longer period, less waste goes into landfill or to pollute nature.