ʻO wai ka mea i ʻoi aku ka kiʻekiʻe o ka pahū-hōʻike pae, BT4 a i ʻole CT4

ʻOi aku ka hoʻohālikelike ʻana i ka pahū o nā mea hana CT4 ma mua o nā lako BT4.

Papa A me Papa	Ka wela wela a me ka hui
-	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	ʻo ʻEtana, Propane, Acetone, Penethyl, Ene, Aminobenzene, Toluene, Benzene, Amonia, Kalapona Monoxide, Ethyl Acetate, Acetic Acid	Butane, Ethanol, Propylene, Butanol, Acetic Acid, Butyl Ester, ʻO Amyl Acetate Acetic Anhydride	Pentane, Hexane, Heptana, Decane, Octane, ʻaila hinu, Hydrogen Sulfide, Cyclohexane, ʻaila hinu, ʻAla ʻaila, Diesel, ʻAla ʻaila	Etera, Acetaldehyde, Trimethylamine		Ethyl Nitrite
IIB	Propylene, Acetylene, Cyclopropane, Kinea umu Coke	Epoxy Z-Alkane, Epoxy Propane, Butadiene, Ethylene	ʻO Dimethyl Etera, ʻO Isoprene, Hydrogen Sulfide	ʻO Diethylether, Dibutyl Etera
IIC	Kaha wai, Hūhāhā	Acetylene			Kalapona Disulfide	Ethyl Nitrate

Hoʻokaʻawale ʻia ʻo BT4 ma ke ʻano he hui wela papa B, ʻaʻole ʻoi aku ka nui o ka wela o ka ʻili o nā mea i helu ʻia ma T4 ma mua o 135°C. Loaʻa iā CT4 kahi helu pahū papa C, e like me BT4, a kūpono no nā kaiapuni me nā kinoea weliweli e like me ka hydrogen a me ka acetylene, e mālama ana i ka mahana wela o ka ili o 135°C.

Ka nui o ka hoʻohana

He kūpono ka BT4 no nā kinoea maʻamau me ka methane, etana, ʻaila ʻaila, a hydrogen sulfide.

Hoʻopili ʻo CT4 i kahi ākea ākea o nā mea maʻamau pahū kinoea, e like me ka hydrogen a me ke kinoea wai ma ka pae CT1, acetylene ma ka pae CT2, a me carbon disulfide ma ka pae CT4.