Need an excuse to indulge in a lobster dinner tonight? In the United States, June 15 is National Lobster Day, a time for savoring and paying tribute to one of Americaâs most beloved crustaceans. In honor of the holiday, check out these shell-shocking facts about lobster and its long, meaty history. â¢ When the first European settlers reached North America, lobsters were so plentiful that they would reportedly wash ashore in piles up to 2 feet high.
An abrasive is a material, often a mineral, that is used to shape or finish a workpiece through rubbing which leads to part of the workpiece being worn away. coated abrasive comprises an abrasive fixed to a backing material such as paper, cloth, rubber, resin, polyester or even metal, many of which are flexible. Sandpaper is a very common coated abrasive.
Toothpaste Abrasiveness. Posted by admin on Apr 4, 2011 in Blog | Comments Off. The toothpaste you are using may be wearing away the enamel and dentin on your teeth, especially at the gumline! The use of âgritâ in toothpaste is not unlike the use of grit on sandpaper. The more grit there is, the more effective it is at removing stain and plaque. Unfortunately, a significant downside is the destruction of tooth structure. There is an abrasive index for toothpastes called the RDA Index. The higher the value, the more abrasive it is. At or below 45 may be acceptable balance between benefit and risk if you must use toothpaste. Over 45 is a matter of how quickly the loss of tooth structure can occur based on the RDA, frequency of use, type of toothbrush and brushing technique.