webertec force EP primer

Preparation

No primer will develop full adhesion to the surface of the substrate without the substrate being carefully prepared. The substrate should be clean and mechanically sound to receive the primer.

When bonding webertec force composites to concrete it is important to check the tensile bond strength fctm of the concrete surface.

A high-strength concrete may have a poor quality surface with a low tensile bond strength and could be unsuitable for bonding.

Minimum fctm values shall be:
1 N/mm2  webertec force carbon sheet
1 N/mm2  webertec force aramid sheet
1 N/mm2  webertec force glass sheet

Tensile bond pull-off tests shall be conducted after the surface has been prepared using light grit blasting or grinding.

Old concrete may be contaminated with oils, grease or salts and these must be removed prior to priming.

New concrete should be cured for at least 14 days using efficient curing techniques. If a spray-on curing compound has been used, this must be removed by light grit blasting prior to priming.

Mixing

Use a clean, dry plastic bucket or container for mixing. Pour in the resin and slowly add the hardener component. Mix thoroughly to an even colour and consistency.

Application

Immediately after mixing, webertec force EP primer should be applied by brush or roller to the prepared surface.

Apply to a uniform, thin coat and brush into the surface. Avoid material running down the substrate.
 

Pot life and cure time

The effective workable time of the mixed primer is comparatively short when left in the mixing vessel, i.e. 20 minutes at 20°C.

The pot life can be extended by pouring the mixed material into a shallow tray to dissipate the heat created during the polymerisation hardening phase.

Temperature            7°C        10°C       20°C
Pot life                      4.5 hr     2.5 hr     1 hr

Yield

5.5 kg pack yielding 5 litres.

3 - 4 m2/litre per coat.