The BT5 explosion-proof rating is considered high.
| Gas Classification | Temperature Group | |||||
|---|---|---|---|---|---|---|
| - | T1 | T2 | T3 | T4 | T5 | T6 |
| - | T＞450 | 450≥T＞300 | 300≥T＞200 | 200≥T＞135 | 135≥T＞100 | 100≥T＞85 |
| I | Methane | |||||
| IIA | Ethane, Propane, Acetone, Phenethyl, Ene, Aminobenzene, Toluene, Benzene, Ammonia, Carbon Monoxide, Ethyl Acetate, Acetic Acid | Butane, Ethanol, Propylene, Butanol, Acetic Acid, Butyl Ester, Amyl Acetate Acetic Anhydride | Pentane, Hexane, Heptane, Decane, Octane, Gasoline, Hydrogen Sulfide, Cyclohexane, Gasoline, Kerosene, Diesel, Petroleum | Ether, Acetaldehyde, Trimethylamine | Ethyl Nitrite | |
| IIB | Propylene, Acetylene, Cyclopropane, Coke Oven Gas | Epoxy Z-Alkane, Epoxy Propane, Butadiene, Ethylene | Dimethyl Ether, Isoprene, Hydrogen Sulfide | Diethylether, Dibutyl Ether | ||
| IIC | Water Gas, Hydrogen | Acetylene | Carbon Disulfide | Ethyl Nitrate | ||
All units are rated at IIB level. However, T4 equipment has a maximum surface temperature limit of 135°C, whereas T5 equipment is limited to 100°C. Lower maximum surface temperatures indicate greater safety. Thus, equipment compliant with BT5 standards is also compatible with BT4, but the reverse does not apply.
