Posts Tagged ‘Expiration’

Troubleshooting standard response issues

Is the problem with standards or only with samples? If the low response is only with extracted samples, the problem is elsewhere in your method. Please see the blog post Now you see it, now you don’t-Troubleshooting method recovery problems. When was the standard ampule opened? If not fresh, open a new one. As mentioned […]

Extending the expiration date on a reference standard

Restek occasionally receives requests from customers on extending the expiration date on their certified reference material or standards that we manufacture. The short answer to this question is no, Restek conducts real-time stability studies and accelerated stress tests to establish reliable expiration dates. Use beyond the identified expiration date is neither recommended nor guaranteed. While […]