| 摘要 |
A method of determination of wear resistance of elements of Braille letters includes cutting a sample under investigation, fastening thereof on a surface with reciprocating motion, pressing a wearing surface treated with a solution imitating a sweat liquid, which contains sodium chloride, urea, lactic acid and distilled water. The wearing surface is covered with natural skin, and the solution additionally contains potassium chloride, sodium sulphate and ammonium chloride. |
