保质期是什么意思？
参考材料的生产商保证在规定的时间内（=保质期）材料的完整性和材料随附证书的有效性，前提是样品经过适当的运输和储存。此外，大多数生产商仅为未开封容器中的材料提供担保。换言之，一旦打开原始材料容器，就无法再保证材料的完整性。这并不意味着用户必须扔掉未使用的样本。通常情况下，材料在合适的条件下储存时会保持稳定（如证书所述），但生产商不再对此负责。
What does the shelf life mean?
Producers of reference materials guarantee within a specified time (=shelf life) the integrity of the material and the validity of the certificate accompanying the material, provided the sample is properly transported and stored. Furthermore, most producers guarantee this only for the material in an unopened container. In other words, once the original material container is opened material integrity can no longer be guaranteed. This does not automatically mean that the user has to throw away the unused sample. Normally, the material will remain stable when stored under suitable conditions (which are described on the certificate), but the producer cannot take responsibility for them any longer.
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