The shelf life of lubricating grease is not specified in the national standard, but its quality depends on the internal quality, and is also related to storage conditions, such as temperature, humidity and other environmental conditions. The storage temperature of lubricating grease is generally 10~25 ℃. Too high temperature will cause the thermal movement of molecules or atoms to intensify, resulting in the weak binding force of grease fibers, oil precipitation and oxidation promotion; The temperature is too low and the consistency increases, which makes it inconvenient to use.
Grease shall be stored dry and ventilated. When the humidity is high, the quality of some greases will change. For example, the surface of sodium base grease will be emulsified and white; Complex calcium base grease will harden due to water absorption.
The good storage environment for lubricating grease is airtight to prevent sunlight, water drenching, wind and sand, etc; In addition, the acid-base substances in the air will also affect the grease and its packaging.
It is also important to protect the packaging of lubricating grease, especially pay attention not to damage the packaging or fall off the container cover during transportation and storage, so as to prevent external impurities from entering the lubricating grease.
The grease with good protection will generally be stored for 2-4 years without quality problems, and the high-performance grease can be longer; However, if the appearance of lubricating grease stored for more than 2 years has obvious changes, its main quality indicators should be sampled and inspected, and then used after passing the inspection to ensure the quality.
