Results: The hardness of black plaster is positively associated with softening point and viscosity, while it is negatively correlated with penetration.
结果：黑膏药的软化点、黏度与软硬度呈正相关，而针入度与软硬度呈负相关。
2
Some product applications require properties of hardness and strength to resist penetration under high pressure and to provide maximum wear qualities only on the surface.
一些产品的用途决定其需要具有耐高压压溃的硬度和强度特性以及表面的耐磨性。
3
The penetration process is similar to Vickers hardness test, it is triaxial compressive stress condition in the target.