Matsumi provides abrasive materials tailored to customer needs.

White Alundum (WA) is a high-purity abrasive characterized by exceptional hardness and balanced friability. Its superior thermal resistance and chemical stability make it the ideal abrasive for precision grinding. Furthermore, its excellent refractory properties and electrical insulation ensure peak performance in advanced fire-resistant applications.

Usage

From precision grinding and coated abrasives to advanced refractories and high-purity filtration media—engineered for excellence in every industrial application.

Quality specifications

Type	Chemical composition
	Ａｌ2Ｏ3	Na2Ｏ	ＳｉＯ2	Fe2O3
WA-MK F8～F90	99.0 min.	0.18 max	-	0.50 max.
WA-MK F100～F220	99.0 min.	0.53 max.	-	0.50 max.

Bulkiness specific gravity

Degree of grain	8	10	12	14	16	20	24	30	36	46
Representative value	1.85	1.85	1.85	1.85	1.82	1.82	1.82	1.79	1.78	1.77

Degree of grain	54	60	70	80	90	100	120	150	180	220
Representative value	1.77	1.77	1.74	1.71	1.67	1.63	1.62	1.59	1.57	1.57

Packaging

20 kg net in 3-layer Kraft paper bags / 500 kg net in flexible intermediate bulk containers (FIBC) / 1000 kg net in flexible intermediate bulk containers (FIBC)