Ambayo Kiwango cha Ushahidi wa Mlipuko Kiko Juu, BT5 au BT4

Ukadiriaji wa kuzuia mlipuko wa BT5 unachukuliwa kuwa wa juu.

Darasa na Kiwango	Joto la Kuwasha na Kikundi
-	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, Asetoni, Phenethyl, Ene, Aminobenzene, Toluini, Benzene, Amonia, Monoxide ya kaboni, Acetate ya Ethyl, Asidi ya Acetiki	Butane, Ethanoli, Propylene, Butanol, Asidi ya Acetiki, Butyl Ester, Amyl Acetate Asetiki anhidridi	Pentane, Hexane, Heptane, Decane, Octane, Petroli, Sulfidi ya hidrojeni, Cyclohexane, Petroli, Mafuta ya taa, Dizeli, Mafuta ya petroli	Etha, Acetaldehyde, Trimethylamine		Ethyl Nitrite
IIB	Propylene, Asetilini, Cyclopropane, Gesi ya Oveni ya Coke	Epoxy Z-Alkane, Propane ya Epoxy, Butadiene, Ethilini	Etha ya Dimethyl, Isoprene, Sulfidi ya hidrojeni	Diethylether, Etha ya Dibutyl
IIC	Gesi ya Maji, Haidrojeni	Asetilini			Disulfidi ya kaboni	Nitrati ya ethyl

Vitengo vyote vimekadiriwa katika kiwango cha IIB. Hata hivyo, Kifaa cha T4 kina kikomo cha juu cha joto cha 135 ° C, ilhali kifaa cha T5 ni kikomo cha 100°C. Kiwango cha chini cha joto cha juu cha uso kinaonyesha usalama zaidi. Hivyo, equipment compliant with BT5 standards is also compatible with BT4, but the reverse does not apply.