R502
R502-
In our country , ultra-cold box usually use R12 / R22 / R502 in high-temperature and R13 in low-temperature .
在我国超低温箱采用的制冷剂一般为，高温级是R12/R22/R502，低温级是R13。
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This paper compares the physical characteristics of R502 and some hydrocarbons of interest asrefrigerants , the results indicate that R1270 is a favorable alternative for R502 .
比较了R502和几种碳氢化合物的饱和蒸气压曲线，结果表明R1270的热物理特性与R502相似。