Ka ʻokoʻa ma waena o ka pae B a me ka C

Hāʻawi ka Papa C i ka palekana i hoʻonui ʻia me ka hoʻomaʻamaʻa ʻana i ka pahū-hōʻoia.

Pūʻulu wela o nā mea uila	ʻO ka wela ili i ʻae ʻia o nā mea uila (℃)	ʻO ke kinoea/māhu wela (℃)	Nā pae wela o ka mea pili
T1	450	＞450	T1~T6
T2	300	＞300	T2~T6
T3	200	＞200	T3~T6
T4	135	＞135	T4~T6
T5	100	＞100	T5~T6
T6	85	＞85	T6

Hōʻike maʻamau nā hoʻolālā Flameproof i ka threading ma mua o nā mea hiki ke hoʻokomo. Hāʻawi nā mea papa C i nā ʻili ahi ʻoi aku ka lōʻihi a me nā hakahaka pahū haiki. Hūhāhā, acetylene, a me kalapona disulfide pono e hoʻohana i ka papa IIC, whereas other substances are adequately served by IIB class.