Views: 10 Author: Site Editor Publish Time: 2021-01-07 Origin: Site
Compared with the traditional R22 refrigerant, the flammability of R290 refrigerant is its "bad temper", and it is also a difficult problem we encounter in practical application. According to the relevant standards, the safety level of R290 refrigerant belongs to the A3 category, which means that it is a highly flammable substance. It is a big problem to ensure safety during use.
Following we list the refrigerant safety classification of the common use refrigerant gas types.
| Property Index | R290 | R32 | R22 | R410a | R134a | |
| Lower Flammable Limit | vol% | 2.1 | 13.5 | NA | NA | NA |
| kg/m3 | 0.038 | 0.306 | NA | NA | NA | |
| Autoignition temperature | ℃ | 470 | 648 | 635 | N.D. | 743 |
| Minimum Ignition Energy | mJ | 0.31 | 30-100 | NA | NA | NA |
| Burning Velocity | cm/s | 46 | 6.7 | NA | NA | NA |
| Heat of Combustion | MJ/kg | 50.3 | 9.4 | 2.2 | -4.4 | 4.2 |
| Occupational Exposure Limit | PPMv | 1000 | 1000 | 1000 | 1000 | 1000 |
| Safety Level (ASHRAE34) | A3 | A2 | A1 | A1 | A1 | |
Lower Flammable Limit (LFL): refers to the minimum flammable concentration (evenly mixed with air) at 23°C and 101.3kPa.
