Grog (clay) Grog, also known as firesand and chamotte, is a ceramic raw material. It has high percentage of silica and alumina. It can be produced by firing selected fire clays to high temperature before grinding and screening to specific particle sizes. It can also be produced from pitchers.
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Top 10 Best Skateboarding Shoes for 2017 Nike SB Janoski Labeled after the famous professional skateboarder, Stefan Janoski, this skate shoes has a classic skate outline that speaks of comfort and durability.