Kedu ọkwa mgbawa-ihe akaebe dị elu, BT5 ma ọ bụ BT4

A na-ahụta ọkwa mgbawa mgbawa BT5 dị elu.

Klas na Ọkwa	Igwe ọkụ ọkụ na otu
-	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, Amonia, Carbon Monoxide, Ethyl acetate, Acid acid	Butane, Ethanol, Propylene, Butanol, Acid acid, Butyl Ester, Amyl acetate acetic anhydride	Pentane, Hexane, Heptane, Decane, Octane, mmanụ ụgbọala, Hydrogen sulfide, Cyclohexane, mmanụ ụgbọala, Kerosene, Diesel, Mmanụ ala	Eter, 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	Mmiri gas, Hydrogen	Acetylene			Carbon Disulfide	Ethyl nitrate

Enyere nkeji niile n'ọkwa IIB. Agbanyeghị, Akụrụngwa T4 nwere oke okpomọkụ dị elu nke 135°C, ebe akụrụngwa T5 nwere oke na 100°C. Okpomọkụ elu dị ala na-egosi nchekwa dị ukwuu. Ya mere, akụrụngwa dabara na ụkpụrụ BT5 dakọtara na BT4, mana ntụgharị anaghị emetụta.