F 300

F300 is a flexible, resistance to high temperatures, acetic based silicone sealant.

Product Description

The sealant is suitable for flexible sealing’s which resist temperatures up to +300°C. Specifically developed to seal flues, boilers, industrial and domestic ovens, pipe-work and conduits subjected to high temperatures when in service.

Field of Application

· Ovens

· Chimney

· Flues

· Heat exchangers

· Boilers

· Pipe works for high temperatures

· Radiators

· Barbeque

Product Details

Product identity

Consistency: thixotropic paste
Color: black
Density (kg/m³): 1400
Viscosity (mPa.s): 300,000
Dry solids content (%): 80


F300 is supplied in:
– 280ml cartridge


The consumption of F300 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