webertec EP structural adhesive

Preparation

No adhesive will develop full bond strength without the surfaces of the CFRP laminate and substrate being carefully prepared to give a mechanically sound clean surface.

Concrete and masonry

The surface must be prepared by mechanical means such as grinding or grit blasting to remove any weak surface laitance or friable material.

The substrate should have an inherent tensile strength greater than 1.5 N/mm2. Pull-off tests should be carried out prior to application of the CFRP laminate.

If the substrate is uneven, then the surface shall be re-profiled with a levelling mortar such as webertec EP mortar.

Check for evenness of substrate.

Timber

Timber surfaces should be prepared by sanding and planing with all dust removed under vacuum. Pull-off tests should be carried out prior to application of the CFRP lamination and ensure substrate preparation is correct.

Mixing

Mix by adding the dark grey hardener to the white resin and mixing for 3 to 5 minutes with a low speed drill and spiral mixing head (EPI MR100).

Mix until a uniform consistency and colour is obtained.

In cold weather it is advisable to store the product unopened in a warm environment for several hours before mixing.

Application

The mixed adhesive shall be placed within the pot life of the adhesive.

Apply the adhesive to the prepared substrate at 1 - 2 mm thick minimum and prepared CFRP laminate at 2 - 3 mm thick by a suitable spreader or knife.

A special profiled spreader plate shall be used with an adhesive bath to apply an even thickness of adhesive to the CFRP laminate in a profiled manner.

Place the glued CFRP laminate onto the glued substrate within the open life of the material.

Apply a hard rubber roller along the centre of the plate to squeeze the adhesive from both sides of the laminate edge and ensure no air voids. Roller to achieve a bond line of approx. 2 - 4 mm thickness. Remove the surplus webertec EP structural adhesive from the sides of the plate.

Cleaning

Clean tools and any uncured adhesive using webertec solvent.

Yield

Yield 5 kg approximately 2·9 litres.

Thickness of adhesive           kg/m²

2mm                                        3.3

4mm                                        6.7

10mm                                      17.0