SILRES^® BS 6921

Formulations based on SILRES^® BS 6921 are applied for stain-resistant impregnation and coating of mineral substrates, e.g. polished or non-polished concrete floors, paving stones, clinker, bricks and natural stone.

For the impregnation of absorbent substrates SILRES^® BS 6921 is treated with 5 % of the aminosilane GENIOSIL® DAPTM as the catalyst. If necessary the viscosity of the formulation can be reduced by the addition of 10 % SILRES® BS 1316.
For substrates with poor or no absorbency, a catalyzed SILRES^® BS 6921 version can be applied as a clear coating. The layer thickness should not exceed 100 μm to ensure full and complete cure. Cure is usually complete after 24 h. In the case of higher absorbent substrates a second coating is recommended. In the case of coatings it is recommended to add UV stabilizers since even for interior use UV exposure cannot be excluded.

Further formulating components comprise rheological additives and matting agents.
Additionally, pigmented and filled coatings are equally possible with SILRES^® BS 6921. The binder content will be up to ~ 40 %.
The catalysed formulations are sensitive towards moisture, however, stable in sealed packaging for at least 1 year. This is the unique benefit of SILRES^® BS 6921: Final formulations can be offered as one part
systems for the end user.

SILRES^® BS 6921 imparts high stain-resistance when applied as an impregnation or as a coating (e.g against stains like coffee, tea, ketchup, orange juice, ink, red wine, household and engine oils etc). Surfaces exhibit high strength, are exceedingly scratch-resistant and impervious to typical cleaning agents.

For formulators:
SILRES^® BS 6921 is easily mixed in a standard mixer or dissolver with the formulation ingredients. The catalyst GENIOSIL® DAPTM is added as the final component.
Upon catalyst addition the mixture becomes moisture sensitive, thus air contact must be avoided. Use of an inert gas or fast filling in sealed packaging is recommended.

For the end user:
During application of formulations based on SILRES^® BS 6921whether for impregnation or coating, the surface must be dry and clean. To define the optimum amount and to check applicative behavior it is recommended to prepare a separate test surface. The material can be applied with a cleaning mop, shorthair roller or a brush. Airless spray application is equally possible.

The open time of the formulation examples outlined here is ~ 20 min depending on temperature and humidity. Treated surfaces are trafficable and durable after 24 hours.

Depending on the absorbency behavior of the substrate a second application (after 24 hours) may be necessary to attain a homogeneous finish.

Depending on the absorbency behavior of the substrate ~ 50 - 150 g/m2 are typically required for the first layer.

In the case of asecond layer, by far a lower amount of material will be needed (~ 50 %). Polishing is possible after 24 hours.