BS ISO 2137:2020 pdf free.Petroleum products and lubricants -Determination of cone penetration of lubricating greases and petrolatum. BS ISO 2137 The cone penetration of lubricating grease is determined at 25 °C by releasing the cone assembly from the penetrometer and allowing the cone to drop for 5 s, and measuring the extent of the penetration. Three determinations shall be made...