Refrigerator Frost & Defrost Test Apparatus for Defrosting Time and Water Evaporation Testing | IEC 62552 Compliant Home Appliance Testing Equipment Product Introduction Anyone who has ever opened a refrigerator with frost knows that a thin layer of ice quickly becomes an inconvenience in daily life. For refrigerator engineers, frost isn't just an inconvenience, but a quantifiable quality issue. How long does it take for the refrigerator compartments to defrost? How quickly