Morundum™ (Alumina)

Morundum™ (Alumina) Overview

Fine powder abrasives require quality control tracing to materials, and for their quality stability, it is important to use high-quality materials.

Showa Denko is one of the leading comprehensive manufacturers in Japan in the field of coarse-particle abrasive material, from which fine powder abrasive is made. The quality of fine powder abrasive provided by Showa Denko is controlled with a consistent system from coarse particle material. We develop various kinds of products as functional fine powder to meet user needs and requirements.

Overview Product Lineup Applications Enquiry

Product Lineup

A:	A standard brown electro-fused-alumina abrasive. Generic fine powder, used for optical polishing, general lapping, grinding wheels, coated abrasives, etc. (particle size: coarse, fine #220~#3000)
WA:	A high-purity white electro-fused-alumina abrasive, suited for applications that must avoid heating. Used for general lapping, grinding wheels, fillers, refractories, etc. (particle size: coarse, fine #240~#8000)A single-crystal abrasive grain, suited for hard materials. In addition to a grade for general use, there are grades for resinoid bonded grinding wheels and coated abrasives.
SA:	A single-crystal abrasive grain, suited for hard materials. In addition to a grade for general use, there are grades for resinoid bonded grinding wheels and coated abrasives.
PW:	A pink lavender color, improved WA, having a longer life span.
SM:	Having compact structure, a very tough cylindrical brown sintered alumina abrasive.
SR:	Having compact structure, a very tough cylindrical high-purity white sintered alumina abrasive. A non-fixed form grade, “SR-3” is also available.
C:	A black silicon carbide abrasive. Generic fine powder, used for general lapping, grinding wheels, coated abrasives, etc (particle size: coarse, fine #240~#4000)
GC:	A high-purity green silicon carbide abrasive. Generic fine powder, used for general lapping, grinding wheels, cutting, fillers, etc. (particle size: coarse, fine #240~#8000)

Size distribution chart:

Download PDF – Macrogrits
Download PDF – Microgrits

Applications

Alumina Abrasive Grains

Product Name	Characteristics	Application
A-40	Standard brown fused alumina. Very little iron content. Mainly for vitrified bonded grinding wheels.	Grinding wheels, coated abrasives, refractories
A-43	Standard brown fused alumina. Mainly for resinoid bonded grinding wheels and abrasive blasting.	Grinding wheels, coated abrasives, abrasive blasting
A-47	Having a sharp edge and friable characteristic, is suited for softer abrasive wheels.	Precision grinding wheels
WA	High-purity white fused alumina abrasive, suited for applications that must avoid heating.	Grinding wheels, coated abrasives, fillers in resin and coatings, electrically insulating material, refractories
SA	Single-crystal type abrasive grain, suited for hard materials.	Grinding wheels, coated abrasives, abrasive blasting
PW	Pink in color, and is an improved version of the WA type. Longer lasting.	Grinding wheels, coated abrasives
SM	Having compact structure, a very tough brown sintered alumina abrasive.	Grinding wheels, barrel
SR	Having compact structure, a tough sintered high-purity white alumina abrasive.	Grinding wheels, barrel

Silicon Carbide Abrasive Grains

Product Name	Characteristics	Application
C	Standard black silicon carbide abrasive	Grinding wheels, coated abrasives, abrasive blasting, refractories
C-25	Black silicon carbide abrasive with a sharp edge	Coated abrasives
GC	High-purity green silicon carbide abrasive	Grinding wheels, refractories

Alumina Abrasive Grains / Typical Properties

Name	Product name	Al203 (wt%)	SiO2 (wt%)	Fe2O3 (wt%)	TiO2 (wt%)	Toughness	Knoop Hardness	Bulk Density	Characteristics
Morundum™	A-40	96.5	0.5	0.1	2.3	Regular	2020	Mid	Brown fused alumina abrasive
Morundum™	A-43	96.5	0.5	0.2	2.3	Regular	2020	Mid	Brown fused alumina abrasive
Morundum™	A-47	96.5	0.5	0.1	2.3	Friable	2020	Low	Brown fused alumina abrasive
White Morundum™	WA	99.6	0.02	0.03	Trace	Tough	2050	Mid	High-purity white fused alumina abrasive
Single Morundum^™	SA	99.6	0.03	0.03	0.3	Friable	2250	Low	Single-crystal type alumina abrasive
Pink Morundum^™	PW	99.3	0.07	0.04	0.3	Regular	2100	Mid	Fused alumina abrasive
Sinter Morundum^™	SM	88.0	3.3	4.8	3.4	Tough	1250	–	Sintered alumina abrasive
Sinter Morundum^™	SR	99.2	0.2	0.1	–	Tough	2000	–	Sintered alumina abrasive

Silicon Carbide Abrasive Grains / Typical Properties

Name	Product name	Al203 (wt%)	SiO2 (wt%)	Fe2O3 (wt%)	TiO2 (wt%)	Toughness	Knoop Hardness	Bulk Density	Characteristics
Densic™	C	98.7	0.2	0.5	0.2	Regular	2700	Mid	Black silicon carbide abrasive
Densic™	C-25	98.0	0.3	0.8	0.3	Friable	2700	Mid	Black silicon carbide abrasive
Green Densic™	GC	99.3	0.2	0.2	0.02	Regular	–	–	–

Packaging unit: 20kg Paper bag, bulk bag

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Morundum™ (Alumina)

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