99久久综合国产精品二区

问：打开的础辫颈别锄辞苍99久久综合国产精品二区的保质期是多长时间？

答：础辫颈别锄辞苍99久久综合国产精品二区复杂的化学结构赋予它们强大的“吸杂”特性，这意味着它们很容易吸收空气中的蒸气，特别是水和其他碳氢化合物。如果挥发性蒸气被吸收，那么润滑脂将失去其优异的蒸气压特性，直到这些污染物被脱气。

这就是我们将润滑脂包装在“防蒸汽”铝管中的原因。由于我们无法控制润滑脂打开后的使用情况，因此我们无法提供产物打开后的保质期。然而，实际上，如果在使用后立即盖上盖并且它们不暴露于挥发物，那么较长的使用寿命应该不成问题。

除了吸收挥发物外，产物很稳定，长期来看不会发生其他变化。Apiezon PFPE 501基于全氟聚醚，因此具有高度惰性，并且比碳氢化合物润滑脂更不易吸收空气中的蒸汽。

Q: What is the shelf life of an opened Apiezon container?

A: The complex chemical structure of Apiezon greases gives them strong ‘gettering’ properties, this means that they will readily absorb airborne vapours particularly water, and other hydrocarbons. If volatile vapours are absorbed then the greases will lose their excellent vapour pressure characteristics until these contaminants have been outgassed.

This is why we pack the greases in ‘vapour-proof’ aluminium tubes. As we have no control over the use of the greases once they have been opened we cannot quote a shelf life for the products after opening. Practically, however, if care is taken in re-capping the tubes immediately after use and they are not exposed to volatiles then a long service life should not be a problem.

Apart from absorption of volatiles the products are stable and no other changes would be anticipated in the long term. Apiezon PFPE 501 is perfluoropolyether-based and hence is highly inert and less likely to absorb airborne vapours than the hydrocarbon greases.

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