ABOUT VITREOSIL HEAT & ACID PROOF,THE VITREOSIL TEST MAY 1926. THE THERMAL SYNDICATE LTD. BROOKLYN HEAD OFFICE: WALLSEND-ON-TYNE,ENGLAND VITREOSIL CONSISTS OF PURE SILICA FUSED BY THE ORIGINAL INTO A THOROUGHLY HOMOGENEOUS AND UNIFORM PRODUCT CONTAINING OVER 99.8% SiO2 INCLUDES AN ILLUSTRATION OF THE HOME OFFICE AND MANU.PLANTS 18PGS FAIR CONDITION- SOME SPILLAGE 4" X 7"

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