Wanne Matsayin Tabbacin Fashe Yafi Girma, AT3 ya da BT4

A cikin nau'ikan gas da yanayin zafi, BT4 ya wuce AT3, don haka samar da mafi girma-hujja rating.

III	C	T135 ℃	Db	IP65
III Kurar saman		T1 450 ℃	Ma	IP65
		T2 300 ℃	Mb
		T3 200 ℃
	A Tawaga masu tashi da wuta		Da
		T4 135 ℃
			Db
	B Kurar da ba ta da ƙarfi	T2 100 ℃	Dc
	C Ƙura mai aiki	T6 85 ℃

Class A ya hada da iskar gas kamar ethane, methanol, ethanol, da fetur; Class B ya ƙunshi iskar gas kamar iskar gas, ethylene, da kuma ethylene oxide.

Rarraba zafin jiki na T3 ya shafi mahalli har zuwa 200 ℃ kuma ya haɗa da 36 iskar gas na yau da kullun kamar man fetur da butyraldehyde. Rarraba T4 yana iyakance yanayin zafi zuwa 135 ℃, kuma don 36 Gas ciki har da acetaldehyde da tetrafluoroethylene.