Topic: yipan

  I. Viscosity. Professional term explanation: The volume characteristics of liquid, quasi-liquid or quasi-solid substances to flow, that is, the internal friction or internal resistance between molecules when flowing under the action of an external force. Generally, viscosity is proportional to hardness. Ii. Hardness. The ability of a material to resist the indentation of a hard object on its surface locally is called hardness. Silicone colorful beaded bracelets custom Shore hardness rang...