Abstract
The author discusses the possibility of using the mineral lepidolite as a ground coat or enamel. The analyses of several samples of lepidolite are given; their refractoriness and expansion values are also calculated. Being high in Al2O3 and containing no B2O3 precludes the use of lepidolite in any essential quantities. Lithium oxide of which lepidolite contains about 4% does not aid in adhesion of the ground coat to cast iron. The patented ground coats with their various materials and minerals are discussed. The literature is reviewed and examples of good and defective ground coats are named using composition data and microphotographs to illustrate the essentials for good ground coat adherence.
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