Think of grease like it is a food item.You wouldn’t store food close to anything producing heat or hot steam would you? If you have food leftovers they most likely would be placed in a sealed container and stored back in a cool dry place right? Well the same goes for greases.
The reason grease needs to be stored in a cool dry place is because of its chemical make-up. Grease is made up of base oils (other ingredients too) that are blended in a thickener that is much like a sponge but not quite. When the thickener is squeezed it releases the base oil or if the grease is introduced to heat the thickener shrinks back and releases the oil.This is why storing grease near any kind of heat will result in oil separating.
Let’s say you store your grease correctly but their does exist other factors to consider too.You may store them in an industrial location near a railroad system that constantly gets a jiggling effect or near a freeway where the same can be said. Since grease does have a shelf life due in part because of gravity, which places a consistent squeeze on the thickening system, over time the oil will separate out. This process of separation is accentuated when jiggled. An equally poor storage location is inside a service vehicle that travels over the roadways.
Always be mindful of the surroundings and not only the dryness or temperatures of storage in order to have the best success with your purchased greases. There is much written about grease storage by all the grease manufactures and chemists throughout the years, but I prefer the food analogy and the gravity jiggling effect. And do always read the manufactures recommendations as they are the true experts on the subject of their products.
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