Temperature Variations: High temperature testing is now commonly used as a predictor of long-term stability. Most companies conduct their high temperature testing at 37oC (98F) and 45oC (113F). If a product is stored at 45oC for three months (and exhibits acceptable stability) then it should be stable at room temperature for two years. Of course, the product must be stored at 25oC (77F) for a period of one year. A good control temperature is 4oC (39F) where most products will exhibit excellent stability. The product should also be subjected to -10oC (14F) for three months.