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Difluoromethane is a Freon substitute with excellent thermal performance. It has a low boiling point (-51.6°C), low pressure ratio and pressure, large refrigeration coefficient, and zero ozone loss. The greenhouse effect is small. It is mainly mixed with HFC-134a and R125. As a substitute for HCFC-22.

Physical and chemical properties

Chemical formula	CH2F2
Molecular weight	52.0
Boiling point, (101.13Kpa), ℃	-51.7
Critical temperature, ℃	78.25
Critical pressure, Kpa	5808
Critical density, kg/m3	430
Latent heat of evaporation (boiling point) KJ/kg	390.5
Flammability	No

Quality Index

Project	Metrics
Project	Premium product	First class	Qualified product
Mass fraction of difluoromethane/% ≥	99.8	99.5	99.0
Mass fraction of moisture/% ≤	0.0010	0.0020	0.0050
Mass fraction of acidity/% (calculated as HCl) ≤	0.00001	0.0001	0.0001
Mass fraction of evaporation residue/% ≤	0.01	0.01	0.02

Packaging, transportation, storage

1. This product should be packed in tank trucks or steel bottles. The filling factor of this product is not more than 0.8kg/L. For reusable packaging, positive pressure should be maintained in the packaging after the product is used.

2. The packaging with this product is strictly prohibited from impact and direct exposure. Cylinders are pressurized containers. Safety helmets and shock-proof rubber bands must be worn during loading and unloading. It is strictly forbidden to hit, drag, drop and expose to direct sunlight.

3. This product should be stored in a cool, dry, well-ventilated warehouse, away from fire and heat sources. Sun and rain are strictly prohibited.