How to correctly evaluate the quality of gas springs?

How to evaluate the quality of Changzhou Global Gas Spring Co., Ltd.'s gas springs: The quality of the springs is mainly considered from the following aspects: firstly, their sealing performance. If the sealing performance is not good, oil leakage, gas leakage and other phenomena may occur during use; Next is accuracy, such as requiring a 500N gas spring; Once again, the service life is calculated based on the number of times it can fully expand and contract; Finally, the force value changes during the stroke, and in an ideal state, the force value of a gas spring should remain constant throughout the entire stroke. However, due to design and processing factors, the force value of the gas spring inevitably changes during the stroke. And the magnitude of its change is an important criterion for measuring the quality of a gas spring. The smaller the magnitude of the change, the better the quality of the gas spring, and vice versa!