Issue link: http://read.dmtmag.com/i/859318
Greases Background & Properties castrol.com/GPS 800 255 4417 May 2025 GPS Industry Specifications A Note on Compatibility For years, the heavy-duty industry believed that grease incompatibility resulted primarily from mixing the thickeners in finished greases. But the additive package, not solely the thickener, is responsible for most incompatibility problems in a finished grease. If you have ever seen grease run out of a component, the cause is usually not the grease's thickener, but the additive chemistry. Certain additives in one grease can chemically attack the soap in another grease, causing it to soen excessively or "go to soup." is occurrence is oen easily excused as incompatibility due to the type of thickener with which each grease is formulated, when in reality, it is influenced more by the additive package. To avoid compatibility problems when switching greases, purge the system completely, if possible, with the new grease. Once the grease is pumped into the component, monitor it closely. Any compatibility problem will become apparent very quickly. ere are laboratory tests available that can analyze grease compatibility by measuring the penetration of the mixed grease at 0, 60 and 10,000 strokes. Compatible greases should experience only minor soening—about one grade on average. Soening above one grade is not acceptable and the greases should be labeled incompatible. But if greases have been labeled incompatible, it does not mean that they cannot be used. oroughly purge the component with the new grease. Once the component has been purged with the new grease, continue to monitor it closely and increase grease service intervals gradually to ensure complete removal of the previous grease. Aluminum Complex Barium Bentone (Clay) Calcium Calcium 12 Hydroxy Calcium Complex Calcium Sulfonate Lithium Lithium 12 Hydroxy Lithium Complex Polyurea Sodium BINARY GREASE MIXTURE COMPATIBIL*TY Aluminum Complex Barium Bentone (Clay) Calcium Calcium 12 Hydroxy Calcium Complex Calcium Sulfonate Lithium Lithium 12 Hydroxy Lithium Complex Polyurea Sodium COMPATIBLE BORDERL*NE - Monitor for softening INCOMPATIBLE - Do not mix! Please Note: GENERAL Guideline. F7