The shelf life of thermal paste depends on a number of factors, including paste quality, storage conditions and how it is used. In general, most thermal paste manufacturers last around 2-3 years.
However, it's important to note that paste can degrade over time due to factors such as exposure to air, temperature variations and humidity. As thermal paste ages, it can lose its heat-conducting properties, which can result in poorer heat dissipation between the processor (or electronic component) and the heat sink. If you have unused thermal paste and wish to extend its life, store it in a cool, dry place, preferably in its original packaging, out of direct sunlight. Before using after prolonged storage, check the paste visually to make sure it hasn't changed color or texture significantly.
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