Ngir baña yàqu, amna ñatti produit yu mag, fourure basalt, asiye fonte ak alumina ceramic.
1st,Basalt
Njariñ: njëg bu yomb
wear resistance aspect: friableness, splintery.Thickness lu tollu ci 25-35mm, ba ci 40mm.When ci biir amna xar-xar, wàll basalt bi dina jeex ak këriñ pulverized dem ci xar-xar bi.

2nd,acier fonté
Cast acier ñu ngi koy jëfandikoo bu bari ci mbañeelu wear, xaralay defar bi yomb na.

3rd, Fourure céramique.
Material bi lu ëpp 92% alumina, dëgër lu ëpp HRV85.Surface ci biir ak biti dañu nooy lool. Wear resistance lu ëpp 10 yoon gëna xéewale ci steel.Weight lu tollu ci 1/3 lu néew buñu ko méngale ak benn pipe steel dëll, liggéey bu yomb.

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