Kedu nke nwere ọkwa mgbawa dị elu, BT4 ma ọ bụ CT4

Nhazi ihe mgbawa nke akụrụngwa CT4 karịrị nke akụrụngwa BT4.

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

BT4 bụ nkewa dị ka otu okpomọkụ Klas B, ebe okpomọkụ kachasị elu nke ngwaọrụ T4 gosiri anaghị agafe 135 Celsius. CT4 na-ejide ọkwa mgbawa Klas C, tụnyere BT4, ma dabara maka gburugburu nwere ikuku dị ize ndụ dịka hydrogen na acetylene, na-edobe oke okpomọkụ nke elu 135°C.

Oke ojiji

BT4 dabara maka gas nkịtị gụnyere methane, ethane, mmanụ ala, na hydrogen sulfide.

CT4 gụnyere ọnụọgụ sara mbara nke na-adịkarị obere mgbawa gas, dị ka hydrogen na mmiri gas na ọkwa CT1, acetylene na ọkwa CT2, na carbon disulfide na ọkwa CT4.