Can expired standards be returned? standard
I have been doing experiments for a long time, and I believe many laboratories have encountered such embarrassing situations: it is the problem of expired standards. Can expired standards be returned? It is a pity to throw away expired standards. If you use them, CNAS will not allow them. Is there any good way? You can follow the National Standard Network to take a look!!!
First, basically according to the CNAS, it is still only destroyed. But if you want, you can use it for internal quality control, that is, without notifying the personnel of the sample content, send them blind samples, let them do inter-personnel comparison tests, and then determine the results of the comparison tests according to the relevant testing standards, which will help the internal quality control.
Second, do a period check to prove that these appearances are usable, that is, the standard value has not changed significantly, or ask the seller to issue a certificate to you, indicating that the value is valid.
3. Expired standards are more suitable for internal quality control, but some laboratories are also used for experiments. If there is a positive result, you can use the standards within the valid period for experiments. If you buy the standards, go to the National Standards Network. Of course, these are not known to CNAS, let alone used for capability verification!!!
IV. The laboratory is used to explore experimental conditions and optimize parameters.
Fifth, the standard that can be used within the valid period can be used first, and then used as the reference substance
6. The expired standard product cannot be used because its purity does not meet the requirements and can only be dealt with separately.)
In fact, the implementation in reality often depends on the wishes of the leader or boss. But if R & D and inspection are to be in line with international standards, it is necessary to update the concept. If the control substance andstandardIt has expired, and the systematic error of the experiment is naturally too large. It is better not to use it or not. As for whether the expired standard products can be returned? This depends on which company you purchased it from. Some manufacturers that have cooperated for a long time can return it, such as the National Standard Products Network. Of course, specific products are treated specifically.
