. . . . . "PowerShield 3W also provides resistance to sunlight, heat, cold and humidity, acids, bases, solvents, salts and other chemicals.Tests conducted by an independent photovoltaic laboratory show that PowerShield 3W can withstand more than 3,000 hours of accelerating aging exposure at 85??C (185??F) and 85% relative humidity, without losing structural integrity, according to Honeywell.Honeywell's Power" .