Kusiyana Pakati pa Mlingo wa Kuphulika-Umboni wa AT4 ndi BT4

Magulu awiriwa amasunga kutentha kwa T4, kotero kusiyana kumabuka pakati pa Zone A ndi Zone B. BT4 yotsimikizira kuphulika imaposa ya AT4.

Condition Category	Gasi Gulu	Woimira mpweya	Minimum Ignition Spark Energy
Pansi pa Mgodi	Ine	Methane	0.280mJ
Mafakitole Kunja Kwa Mgodi	IIA	Propane	0.180mJ
	IIB	Ethylene	0.060mJ
	IIC	haidrojeni	0.019mJ

Pali kusiyana kwakukulu pakati pa Kalasi ⅱa ndi Kalasi ⅱb. Kalasi ⅱb, gawo lapamwamba, amapangidwira mafuta ngati mafuta, dizilo, ndi mafuta ochepa; Kalasi ⅱa, mbali inayi, imagwira ntchito kumadera omwe sangaphulike, monga propylene.

Zimatengera ngati chinthu chikugwera pansi pa Class ⅱa kapena Class ⅱb. Zida zovotera Class ⅱa zitha kugwiritsidwa ntchito m'malo a Class ⅱa; komabe, Malo a Class ⅱb sangathe kugwiritsa ntchito zida za Class ⅱa.