Features
R290 is a propane that is a flammable hydrocarbon. Therefore, it is often used as LP gas. Since it has such a strong flame, it is a material that is difficult to use in air conditioners, but it is a natural refrigerant, and because GWP is very low, and enough performance is obtained as a device, it is recommended to introduce it to the room air conditioner now in Europe and China. Already Japan Noritz sells equipment using this refrigerant as a heat pump water heater.
| Refrigerant number | R290 |
| Other names | Propane |
| Category | HC (Hydro carbon) |
| Molecular structure |  |
| ODP | 0 |
| GWP | < 3 |
| Safety classification | Flammable, non-toxic (A3) |