Ana amfani da shi azaman keɓewar keɓewar da ke hana fashewa don aikin bututu ko aikin wayar da kebul.
1. Mai haɗari: division 1&2 ko zone 21,22;
2. Fashewa ko yanayin tururi: aji Ⅱ A, ⅡB, Ⅱ C , ƙurar ƙura mai flam-mable;
3. Cikin gida ko waje;
4.Ajin zafin jiki: T1 ~ T6.