Vapor Pressure Tests

To evaluate the effectiveness of Transcend^® additive technology in reducing the vapor pressure of HFC-134a/polyol premixes, we compared various levels of Transcend from 0 to 50 mole% in 10 mole% increments. The amount o fwater remains constant at 40 mole%.

The results indicate a steady reduction of overall vapor pressure as the level of Transcend^® additive increases. For example, we can reduce the vapor pressure of the overall system by about 15 psi (at 25 °C) when we change the "B" side composition from 60 mole% HFC-134a to 40 mole% HFC-134a and 20 mole% Transcend^®. The vapor pressure decreases from about 72 psia to 57 psia.