This standard is applicable to acid-resistant phenolic plastic flange-type 45° elbows with an allowable temperature of -30°C to 130°C and an allowable pressure specified in the following table.
HG/T 2129.17-1991 history
1991HG/T 2129.17-1991 Flange type 45° elbow for chemical equipment parts made of acid-resistant phenolic plastic