- Primarily used in glazes as a source of silica to harden a glaze surface and reduce crazing. Product name stated on the bag is Ottawa Silica Sil-Co-Sil #53. NOTE:This product does not ship to California.
- WARNING: Contains free crystalline silica, which could lead to silicosis or other lung diseases after very long exposure. IRAC has classified crystalline silica as a carcinogen, based on evidence of carcinogenicity in experimental animals and limited evidence of carcinogenicity to humans. Wear a NIOSH approved respirator. For further information, contact: Rovin Ceramics at 734/424.3345