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BS 1539 1949 Edition, April 5, 1949
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Specification. Moulded electrical insulating materials for use at high temperatures
Includes all amendments and changes through Amendment 2, April 5, 1949
Additional Comments: W/D NO S/S
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Materials, other than ceramics and glass, for use above 180°C. Three main classes of material according to resistance to flame. Electrical properties, thermal properties, strength, general properties. Test methods appended.