AC 500 Mould Resistant

AC 500 Mould Resistant is an acetic-hardening silicone sealant with special inhibitors to make it resistant to the formation of mould.

Product Description

The sealant is in the form of soft paste with a thixotropic consistency that is easy to apply on both horizontal and vertical surfaces. It hardens at room temperature thanks to the moisture present in the surrounding air and forms a flexible seal that allows joints to expand and contract by up to 20% of their original size. AC 500 Mould Resistant offers resistance to all types of weather conditions, industrial surroundings, thermal shocks, immersion in water and exposure to damp environments. It adheres strongly to glass, ceramic, painted surfaces and certain types of plastic without the use of a primer.

Field of Application

AC 500 Mould Resistant is used to make watertight seals in joints and gaps between similar and different types of building materials, including those permanently exposed to damp conditions. Once polymerization has taken place, it forms a perfect, flexible seal which adheres well to glass, ceramic and painted metal surfaces and is highly resistant to the formation of surface mould.

It is used for:

· Mould resistant seals in bathrooms, kitchens, laundry rooms and damp environments.

· Sealing sanitary fittings, bath-tubs, shower booths and saunas.

· Sealing greenhouses.

· Sealing U profile glass (U-glass).

· Sealing between glass and window frames.

· Sealing air and water vents.

Product Details

Product identity

Consistency: thixotropic paste
Color: Different colors
Density (kg/m³): 900
Viscosity (mPa.s): 300,000
Dry solids content (%): 80


AC 500 Mould Resistant is supplied in:
– 280ml cartridge


The consumption of AC 500 Mould Resistant depends on the application. Typical consumption is between 100 and 120 ml/mL.

Application Procedure

Preparation of substrate

Surfaces to be sealed must be dry, de-greased, solid and free of dust, loose parts, oil, grease, wax, old paintwork and rust on metal surfaces. We recommend applying masking tape along the edges of the joint in order to avoid the sealant seeping out of the joint and to get a more attractive finish.

Preparing the product

Ready to be used.

Applying the product

Insert the cartridge in an extrusion gun, cut off the tip of the cartridge, screw on the extrusion nozzle, trim the nozzle at an angle of 45° and according to the extruded width required and squeeze out the product in a continuous flow into the joint while trying to avoid air entering the joint. Immediately after applying the sealant, smooth over the surface before it hardens with a spatula wetted with soap and water. Remove the masking tape immediately after smoothing over the sealant