Refrigerant -134a is one of the leading candidates candidates to replace R-12 in many of the applications employing this refrigerant. Refrigerant -134a is an HFC and has a zero ozone depletion potential and a low greenhouse effect. It is nonflammable and nonexplosive,and preliminary data indicate a favorable toxicology as well as chemical stability within the refrigerating system,although it does have a relatively high affinity for moisture.