Heerka Caddeynta Qarxa Keebaa Sare, BT5 ama BT4

BT5-qiimaynta-ilaalinta qaraxa waxaa loo arkaa mid sare.

Heerka Iyo Heerka	Heerkulka Dabka Iyo Kooxda
-	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, Ammonia, Kaarboon monoksaydh, Ethyl acetate, Acid acid	Butane, Ethanol, Propylene, Butanol, Acid acid, Butyl Ester, Amyl Acetate Acetic Anhydride	Pentane, Hexane, Heptane, Decane, Octane, Shidaal, Hydrogen Sulfide, Cyclohexane, Shidaal, Kerosene, Naaftada, Batroolka	Eter, Acetaldehyde, Trimethylamine		Ethyl Nitrite
IIB	Propylene, Acetylene, Cyclopropane, Coke Oven Gaas	Epoxy Z-Alkane, Epoxy Propane, Butadiene, Ethylene	Dimethyl Ether, Isprene, Hydrogen Sulfide	Diethylether, Dibutyl Ether
IIC	Gaaska Biyaha, Hydrogen	Acetylene			Kaarboon Disulfide	Ethyl Nitrate

Dhammaan cutubyada waxaa lagu qiimeeyay heerka IIB. Si kastaba ha ahaatee, Qalabka T4 wuxuu leeyahay xadka heerkulka ugu sarreeya ee 135 ° C, halka qalabka T5 uu ku kooban yahay 100°C. Heerkulka dusha hoose ee ugu sarreeya ayaa muujinaya badbaado weyn. Sidaas darteed, Qalabka u hoggaansan heerarka BT5 ayaa sidoo kale ku habboon BT4, laakiin cagsigu ma khuseeyo.