GB/T 38100-2019 in English

This standard specifies 7 types of ratios (R407A-G) of the R407 series mixed refrigerants composed of three components: R32, R125 and R134a. The nominal ratio is allowed to fluctuate within the range of ±2%~±5%. Key technical indicator requirements:

• Purity ≥ 99.8% (superior product)
• Moisture content ≤ 0.001%
• Acidity (as HCl) ≤ 0.0001%

Gas chromatography analysis specifications

A GS-GASPRO chromatographic column (60m×0.32mm) was used, the linear velocity of hydrogen carrier gas was 40cm/s, and the temperature was programmed from 80℃(6min)→180℃(2min). Special attention should be paid to:

1. When determining the relative correction factor, the correction factor of R134a to R32 is calculated as follows:
   f_R134a = (m_R134a×A_R32)/(m_R32×A_R134a)
2. Sampling requires the use of 2-5L aluminum-plastic composite film air bags, and rubber materials should be avoided

Moisture detection arbitration method

Karl Fischer coulometric method is the arbitration method for moisture content determination, with a detection limit of 0.0001%

Packaging and Transportation Specifications

• Special cylinder painting requirements: aluminum white for repeated use and orange for disposable use
• The filling coefficient is very different: R407G is 1.01kg/L, while R407B is only 0.87kg/L

First aid measures

When frostbite occurs due to contact with liquid, the affected area should be immediately soaked in 41-46℃ warm water. Dry heat or friction is prohibited