主要原料是三氧化二铝（AI2O3）含量为70%～80%，含较多的氧化硅和氧化钛等杂质，呈黑色的一种刚玉。是一种新型环保材料。
黑刚玉砂(又名低铝刚玉砂，铁砂粉)是一种新型抛光材料。
Black Aluminium Oxide AbrasiveBlack Aluminium Oxide abrasive (lower Aluminium Oxide abrasive) is a new type abrasive material for polishing various metal works.
黑刚玉砂（又名低铝刚玉砂，铁砂粉）是一种新型抛光材料。
Black Aluminium Oxide Abrasive
Black Aluminium Oxide Abrasive(lower Aluminium Oxide Abrasive)is a new type abrasive material for polishing various metal works.
我公司生产的油石有棕刚玉（A）、白刚玉（WA）、黑碳化硅（C）、绿碳化硅（GC）等材质。
The oilstones produced by our company include brown corundum(A), white corundum(WA), black carborundum(C), green carborundum(GC)etc.
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