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解説
ステアタイト，滑石を主成分として焼成されたセラミックス。ステアタイト，マグネシウム，シリコン，アルミニウムの酸化物を含んだ滑石で緻密質塊状のもの，また滑石を主成分とする素地またはその磁器の呼称。主要産地はアメリカ，フランス，ノルウェー，中国など。高周波の誘電損失が小さく，強度が高いため高周波絶縁材料などエレクトロセラミックスとして使用されるほか，磁器の生素地として，また透光性を増すために素地に添加して使用される。
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化学的特性
White, apple-green, gray powder; pearly
or greasy luster, greasy feel. Mohs hardness 1–1.5
(may be harder when impure), high resistance to
acids, alkalies, and heat.
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使用
Chiefly as a ceramic insulator in electronic
devices.
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定義
A natural hydrous magnesium silicate. Compact,
massive varieties may be called steatite in distinction
from the foliated varieties, which are called
talc. Soapstone is an impure variety of steatite.
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危険性
Toxic by inhalation. Effects pulmonary
function and causes pulmonary fibrosis. Questionable
carcinogen.
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健康ハザード
The fibrous talc in soapstone
dust causes fibrotic pneumoconiosis; an increased
incidence of cancer of the lungs and
pleura has been reported.
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工業用途
Steatites are noted for their excellent electricalproperties and low cost. They are easily formedand fired at relatively low temperatures. However,compositions containing little or no clayor plastic material present fabricating problemsbecause of a narrow firing range. Steatite partsare vacuum-tight, can be readily bonded toother materials, and can be glazed or ground tohigh-quality surfaces.
