Use of Lubricating Agents in Engineering Polymer Formulations

Some engineering polymers contain a variety of lubricating agents such as PTFE, graphite, molybdenum sulfide and silicone, which impart to them special properties, see Table 2.14. The uses of lubricants in polymer formulation manufacture, e.g., valve seals, compression rings, piston rings, bearings and so on, is relevant in applications where wear is a consideration. 

In a particular example the incorporation of 2% silicone into polyacetal improved elongation at break from 0. 5 to 50%. 

Polyimides (20%) Valve seals, compression rings and bearings 

PI Piston rings, machine tools, bearings and valve discs 

Polyphenylene sulfide (20%) Anti-friction gears, bolts and screws 

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