Morundum™ (Alumina)

Product Series - Electronics

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.

Line Up

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  
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  
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: Paper bag, one way bag

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