O le fea e sili atu ona maualuga le tulaga e le mafai ona pa, BT4 poʻo le CT4

O le fa'avasegaina o mea fa'apitoa a le CT4 e sili atu le fa'avasegaina o masini BT4.

Vasega Ma Tulaga	Tempera Fa'amumu ma Vaega
-	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	Etana, Propane, Acetone, Phenethyl, Ene, Aminobenzene, Toluene, Benzene, Amonia, Carbon Monoxide, Ethyl Acetate, Acetic Acid	Butane, Ethanol, Propylene, Butanol, Acetic Acid, Butyl Ester, Amyl Acetate Acetic Anhydride	Pentane, Hexane, Heptane, Decane, Oktane, Gasolini, Hydrogen Sulfide, Cyclohexane, Gasolini, Kerosene, Tisele, Suauu	Eteru, Acetaldehyde, Trimethylamine		Ethyl Nitrite
IIB	Propylene, Acetylene, Cyclopropane, Kesi Oven Coke	Epoxy Z-Alkana, Epoxy Propane, Butadiene, Ethylene	Dimethyl Eteru, Isoprene, Hydrogen Sulfide	Diethyleter, Dibutyl Eteru
IIC	Vai Kasa, Hydrogen	Acetylene			Carbon Disulfide	Ethyl Nitrate

BT4 ua fa'avasegaina o se Vasega B vaega vevela, pe afai o le maualuga maualuga o le vevela o masini T4 e le sili atu i le 135°C. O le CT4 o lo'o umia le Vasega C e fa'amaonia le pa'u, fa'atusa ile BT4, ma e talafeagai mo siosiomaga ma le kesi leaga pei o le hydrogen ma acethyne, tausia le maualuga o le vevela o le 135 ° C.

Aotelega o le Faaaogaina

BT4 e talafeagai mo le palu masani e aofia ai methane, etana, suauu, ma hydrogen sulfide.

Ct4 aofia ai se lautele lautele o le masani masani mea pāpā kasa, pei o le hydrogen ma vai kesi i le CT1 tulaga, Acetylene i le CT2 tulaga, ma carbon duelffide i le ct4 tulaga.