hard paraffin

例句：

1. 1.The hard paraffin is used in the manufacturing of various products.
   硬石蜡用于制造各种产品。
2. 2.The hard paraffin was extracted from the petroleum.
   硬石蜡是从石油中提取的。
3. 3. The hard paraffin has a high melting point and low viscosity.
   硬石蜡具有高熔点和低粘度。