New standards for color and tinting strength of paint pigments
- Publisher
- Elsevier Science
- Year
- 1945
- Tongue
- English
- Weight
- 60 KB
- Volume
- 240
- Category
- Article
- ISSN
- 0016-0032
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✦ Synopsis
chan~es in thickness of the phlogopite and muscovite samples indicate that the former resist elevated temperatures better than the latter. The large increases in thickness of nearly all of the muscovite samples accompanied changes from clear or translucent to opaque, or from polychrome to metallic color.
None of the species of mica can be considered as a substance or material of fixed and reproducible properties; there are wide variations in thermal expansion, power factor, and color. These properties of mica depend largely upon the chemical composition, the nature of the crystals, their magnitude and their orientation, the presence of impurities, the way in which these enter the structure, the heat treatment, etc.
Some of the phlogopite and biotite micas, which possess extremely high thermal expansion in a direction perpendicular to the cleavage plane, may be used for high-expanding elements in temperature responsive devices, but on the other hand, may prove unsatisfactory in applications where large changes in dimensions with changes in temperature are not desired.