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Aluminas, Spherical & Thermally Conductive Fillers, DAM/DAW, ASFP-20

Manufactured in Japan by DENKA (DENKI KAGAKU KOGYO K.K.)

S.E.M. Photo

1. Introduction

So far, a crystal silica, AIN and Si3N4 filler, has been supplied against inquiry of the high thermal conductance filler filled in resin and rubber. However, the performance for the chemical stability, flowability and mold abrasion were not enough. A new spherical alumina filler was developed that has high thermal conductance and basic required characteristics as silica filler by utilizing various technological knowledge that improved the silica filler over a long period.

2. Basic characteristics of high thermal conductive filler

2 - 1. DAM Series
This grade is high level spherical alumina filler which is produced by high temperature fusing technology. Products that have several particle size distribution (herein after: P.S.D.) (representative value) are prepared.

2 - 2. DAW Series
This product has drastically reduced alumina peculiar ionic impurity content represented by Na ion through the special processing. Products that have several P.S.D. (representative value) are prepared.

DAM/DAW General Properties
			DAM/DAW Series
			70	45	07	05	03
Al2O3		wt.%	>99.8	>99.8	>99.8	>99.8	>99.8
Specific Surface Area		m2/g	0.1	0.2	0.3	0.5	0.7
Mean Particle size		µm	70	45	9	5	3
Sieve 75µm		%	-	<0.5	<0.5	<0.5	<0.5
Fe2+/ionic impurity		ppm	18.0	15.0	12.0	7.0	5.0
Ionic Impurity			DAM
	Electric Conductivity	µS/cm	80	45	45	70	70
	Na+	ppm	40.0	40.0	155.0	180.0	180.0
	Cl-	ppm	0.5	0.5	1.0	1.0	1.0
			DAW
	Electric Conductivity	µS/cm	8	8	8	10	10
	Na+	ppm	15.0	6.0	7.5	10.0	10.0
	Cl-	ppm	0.2	0.2	0.2	0.3	0.3

			ASFP-20
Al2O3		wt%	99.9
Specific surface Area		m2/g	12-18
Mean Particle size		µm	0.2-0.5
Ionic Impurity
	Electric Conductivity	µS/cm	50
	Fe2+	ppm	3.0
	Na+	ppm	20.0
	Cl-	ppm	0.2

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