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WhichExplosion-ProofLevelIsHigher,BT5orBT4|TechnicalSpecifications

Technical Specifications

Which Explosion-Proof Level Is Higher, BT5 or BT4

The BT5 explosion-proof rating is considered high.

Class And LevelIgnition Temperature And Group
-T1T2T3T4T5T6
-T>450450≥T>300300≥T>200200≥T>135135≥T>100100≥T>85
IMethane
IIAEthane, Propane, Acetone, Phenethyl, Ene, Aminobenzene, Toluene, Benzene, Ammonia, Carbon Monoxide, Ethyl Acetate, Acetic AcidButane, Ethanol, Propylene, Butanol, Acetic Acid, Butyl Ester, Amyl Acetate Acetic AnhydridePentane, Hexane, Heptane, Decane, Octane, Gasoline, Hydrogen Sulfide, Cyclohexane, Gasoline, Kerosene, Diesel, PetroleumEther, Acetaldehyde, TrimethylamineEthyl Nitrite
IIBPropylene, Acetylene, Cyclopropane, Coke Oven GasEpoxy Z-Alkane, Epoxy Propane, Butadiene, EthyleneDimethyl Ether, Isoprene, Hydrogen SulfideDiethylether, Dibutyl Ether
IICWater Gas, HydrogenAcetyleneCarbon DisulfideEthyl 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.

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