Four ball test for EP/AW properties

• Helps to evaluate AW/EP additives under certain friction conditions
• 1 rotating ball in top of 3 fixed balls under a defined pressure force

Method: Standard

Weld load/OK load DIN 51530-2/4 (grease/oil)

Wear DIN 51520-3/5

Method: Description

Weld load/OK load

• OK load: Load shortly before welding of the balls
• Weld load:Force when welding of the balls occurs

Wear

• Wear calotte
• load: 150 - 1200 N
• Test duration: 1 min or 1 h

Method: Statement

Weld load/OK load EP-properties (> 2000N EP-lubricant)

Wear AW properties

Method: Unit

Weld load/OK load in N

Wear In mm at 1 or 150 kg/1 min