| Opaque glaze |
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A nontransparent colored or colorless glaze. (ASTM C 242).
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| Open time |
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The period of time during which the bond coat retains its ability to adhere to the tile and bond the tile to the substrate.
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| Orangepeel |
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A pitted texture of a fired glaze resembling the surface of rough orange peel. (ASTM C 242)
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| Organic adhesive |
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A prepared organic material, ready to tire with no further addition of liquid or powder, itsed for bonding tile to hack-up material by the thinset method. Cures or sets by evaporation.
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| Oven ware |
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Ceramic whiteware for culinary oven use. (ASTM C 242).
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| Overglaze decoration |
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See Decoration, overglaze.
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