R503(Freon 503)ultralow temperature refrigerantIt is mainly used in cryogenic equipment such as ultra-low temperature refrigerators or freezers, blood bank refrigerators, freeze-dryers/freeze-dryers, environmental test chambers/equipment (cold and hot impact testing machines), biochemical test chambers and other cryogenic equipment (including scientific research refrigeration, medical refrigeration, etc.), and is more commonly used in the low temperature section of these cascade refrigeration systems.
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