prov:value
| - be about 30 Shore D or greater, such as about 30???70 Shore D, about 40???65 Shore D, about 40???55 Shore D, less than about 45 Shore D, less than about 40 Shore D, about 25???40 Shore D, or about 30???40 Shore D. The material hardness ratio of softer layer to harder layer can be about 0.8 or less, such as about 0.75, about 0.7, about 0.5, about 0.45, or less.
|