EXTREME PRESSURE LUBRICATION

1. At working conditions where sliding/moving surface are under high pressure and high speed, the machine surfaces normally attain slightly higher temperature.
2. Under such working condition, the liquid lubricant may not stick to the surfaces and it may also decompose at that temperature, losing its lubricating capacity.
3. To satisfy the requirement of a lubricant under such extreme conditions, generally mineral oils with special additives are used.
4. Such additives used to improve specific characteristics of a lubricating oil are known as extreme pressure additives.
5. The machines in which E.T.P. lubrication is applied are, cutting tools , rock cutting machines, wire drawing machines etc.

Essentials characteristics of lubricants most suitable for ETP lubrications,

1. Should have tendency to adhere on metal surfaces,
2. Should get agreegated by greater force of attraction and forms films which would stick on metal surface and is retained for longer time.
3. Should be able to sustain high temperature and pressure