Abstract: In order to analyzes and verifies the refrigeration and preservation performance indexes of household refrigerators, quantitatively detects their preservation performance from two indexes, namely weight loss rate and vitamin C retention rate, and forms the characteristic quantitative indexes of product performance. The indexes are formulated as "Implementation Rules for Characteristic Appliance Certification" and "Technical Specifications for Characteristic Appliance Certification - Technical Requirements for Certification of Fresh-keeping Refrigerators", which are used for quality activities of product performance certification.

Key words: Fresh-keeping, Characteristic certification, Weight loss rate, Vitamin C retention rate