Semisolid lubricant is a solid to semi-fluid product of dispersion of a thickening agent in a liquid lubricant. The most widely used semisolids lubricants are greases and Vaseline.
The semi solid lubricants are used under working conditions:
- Low speed and high pressure and high temperature upto 800C
- In places where the bearing has to be scaled against entry of dirty water, dust and grit.
- Machines where liquid lubricant cannot be maintained in position due to intermittent operations of machine parts such as shaft.
- Machines used in textile mills, paper and food product manufacturing etc., where spilling and spurting of lubricant is harmful to the product.