Restek\u2019s reference standards are provided with documentation that states the recommended storage conditions needed to ensure the optimal stability of the components in that specific standard. Storage at lower-than-specified temperatures is acceptable unless otherwise noted on the certificate. (If the ampul is stored at lower temperatures, be sure to invert the ampul several times prior to opening. In the event of observable undissolved material, warm and sonicate the ampul before opening.)<\/p>\n\n\n\n
Short-term exposures (\u2264 seven total days) to higher temperatures is acceptable and should not, based on our studies, negatively affect the long-term stability of your product. For specific statements and claims on product uncertainty as a result of short-term exposures to elevated temperatures, refer to the certified uncertainty value notes on each product\u2019s certificate.<\/p>\n\n\n\n
Please note that once the product is opened, the integrity of the standard is subject to handling and storage conditions, and it cannot be guaranteed.<\/p>\n\n\n\n
For more information about reference standard storage, review our technical video on How to Store Reference Standards<\/a>.<\/p>\n\n\n\n