Product
Description
Standard
Comments
UVA 60452A PC BLUISH The most standard product. Based on 5% Benzotriazole Dimeric UVA (BTA). With good protection performances. This is a standard product in Europe.

Cap layer compound

UVA 63970 PC BLUISH Similar product to the 60452A but contains 6% BTA and therefore with improved protection performances

Cap layer compound

UVA 6B130 PC BLUISH Based on 5% Cyano-Acrylate UVA. With protection performances similar to 60452A, but with significantly reduced plate out level

Cap layer compound

UVA 6D49D PC BLUISH Acceptable UV protection performances. With very low plate-out (the product with the lowest plate out)

Cap layer compound

UVA 6E340 PC BLUISH Based on 7% BTA. With improved protection performances. Mainly serving the Far-East and other hot climate markets.

Cap layer compound

UVA 607890 PC BLUISH Based on 10% BTA. With very good protection performances. For longer service life: 15 years, or for world locations with high UV radiation (e.g. Australia)

Cap layer compound

All PC sheets are protected with a thin co-extruded layer (Cap Layer). This layer is based on PC resin, enriched with a high level of UV absorbers.

The recommended layer thickness is 30-40 microns taking into consideration the layer erosion over the service life and the UV additive optical density, so no harmful UV light will penetrate the Cap Layer to the unprotected Polycarbonate.

In most cases PC sheet producers apply the Cap Layer as a ready compound, supplied by compounders.

The UV compounds are design to be applied on the sheets as a compound (100%). All compounds are colored with a bluish tint to hide the UVA yellow shade, and contain optical-brightener to enable layer identification by the sheet producer.

Beside the standard coloring level offered by Kafrit, special level of coloring is an option in case of special requests.

The compound flow properties are a key factor in uniform and stable layer distribution across the sheets width. The Cap Layer flow is determinate by the PC type, lubricants level and most important the UV absorbers types and level.  Kafrit products flows are optimized based on years of experience. However, not necessarily the optimization for one customer (production line) is the same for the other.

Based on special request, the compound flow can be modified for best layer distribution. Plate-out level is as minimal as UVA types allow based on optimization of the entire formula.Different types of UVA perform differently in terms of Plate-out levels and off-course in terms of protection performances.