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We guarantee that our solid sheets, multi-skin sheets, corrugated sheets, blocks, tubes and rods marketed under the PLEXIGLAS® trademark will show no visible yellowing and will retain their maximum light transmission for 30 years.
Upon delivery, clear-transparent PLEXIGLAS® has a yellowness index of 0 to 1. Depending on the grade of product and site of utilization, the yellowness index is only 4 to 7 delta higher after 30 years. The yellowness index is measured according to DIN 5036 on clean, polished specimens that were conditioned to a state of equilibrium in a standard conditioning atmosphere at 23 °C/50 % relative humidity (RH).
Upon delivery, clear PLEXIGLAS® shows a light transmission of up to 92%, depending on grade and version. Depending on the product grade and version, the light transmission is only 2 to 8% lower after 30 years. The transmittance τD65 is measured according to DIN 5036 on clean, polished specimens that were conditioned to a state of equilibrium in a standard conditioning atmosphere at 23 °C/50% relative humidity (RH).
As part of our obligation to ensure the quality of our products, we use the best available pigments and colorants to color our PLEXIGLAS® products. The colorants and pigments receive additional protection against weathering by being embedded in highly UV-stable PLEXIGLAS®. The natural UV stability of PLEXIGLAS® also ensures that the product surfaces retain their original gloss and do not become eroded.
The color changes of all grades and versions of the product within 10 years are so slight that they are not perceived when viewed in the normal manner. In addition to this guarantee of colorfastness, we also offer specific guarantees for individual projects.