webertec force EP bonding adhesive

Preparation

No adhesive 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 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.

Once prepared, the surface shall be primed with one coat of webertec force EP primer. The bonding adhesive must be applied whilst the primer is still tacky.

Do not let the primer cure before applying the adhesive.

Mixing

• Use a clean, dry plastic bucket or container for mixing
• Pour in the resin and slowly add the hardener component
• Alternatively mix within the tin
• Mix thoroughly to an even colour and consistency using a slow-speed drill and spiral head mixer

Application

Immediately after mixing, webertec force EP bonding adhesive 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.

For application of composite sheets, see individual data sheets.

Pot life and Cure time

The effective workable time of mixed webertec force EP bonding adhesive 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      5°C      10°C       20°C
Pot life                 6 hr      3 hr       1 hr

Yield

5.5 kg pack yielding 5 litres.

2 - 3 m2/litre per coat.