THE USE OF SYENITES IN SEMIVITREOUS WARE: II, PLANT TRIALS*

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Abstract
Five‐inch plates indicating promising results were made from semivitreous bodies prepared (1) by introducing the syenite in reduced amounts and (2) by counteracting the greater fluxing action of the syenites as compared to feldspar by reducing the firing temperature. These plates passed autoclave, heat shock, impact, and chipping tests satisfactorily. When the plates embodying syenite failed after repeated tests, the failure was caused by dunting. In no case did crazing occur. Bodies in which equal parts of syenites were substituted for feldspar gave increased values for modulus of rupture and modulus of elasticity, but for the same degree of absorption the values fell within the same range. The syenite bodies showed less tendency to warpage than the feldspar body. The linear coefficient of expansion of the syenite bodies is greater than the corresponding feldspar body, and bodies combining feldspar and syenite are intermediate in this respect. Photomicrographs of body structure are included.

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