Kyowa Chemical Industry Co., Ltd. Member of SETOLAS

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Classified by Substance Magnesium Oxide MgO

Kyowamag™

Kyowamag™ is general grade brand of lightly calcined magnesium oxide, and the reaction will be different by degree of grade. It is used in the vulcanizing agent of synthetic rubber, acid acceptor and formulation of adhesive.

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Kyowamag™ MF

Comparing with Kyowamag™, MF is sharp particle size distribution, fine particle size and high purity magnesium oxide. We are able to offer a variety grades depending on the reactivity. Dispersibility in the resin is excellent, so it is also used in as additive and the metalic raw materials.

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PYROKISUMA™ 5301/PYROKISUMA™ 3320

PYROKISUMA™ is magnesium oxide having improved the moisture absorbency. Due to its low reactivity, it can be highly filled to the polymer. It is also used in synthetic resins and synthetic rubbers as thermal conductive filer, because of its high heat conductivity.

SDS (download)

Others(high purity and special grade and others)

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[Typical Analysis]

Kyowamag™ PYROKISUMA™
30 150 MF30 MF150 5301 3320
MgO [wt%] 98 98 99.7 99.6 99.96 99.97
CaO [wt%] 0.63 0.78 0.06 0.06 0.03 0.03
Fe [ppm] 180 180 12 12 25 50
Drying Loss [wt%] 0.6 0.7 0.6 1.0 0.06 0.01
Ignition Loss [wt%] 2.5 5.2 2.5 6.0 0.25 0.03
Specific surface area (BET method)
[m2/g]		 40 155 30 135 1.4 0.5
Particle size distribution %10 [μm] 1.56 1.99 0.32 0.35 0.71 5.52
%50 [μm] 3.16 4.46 0.54 0.71 2.85 17.0
%90 [μm] 7.03 11.9 1.03 1.36 8.18 36.9
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