> For the complete documentation index, see [llms.txt](https://knowledge.illumina.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://knowledge.illumina.com/library-preparation/general-library-prep/library-preparation-general-library-prep-faq-list/000005798.md).

# Can library preparation reagents be stored in a frost-free freezer?

Frost-free freezers undergo cycles of light thawing to prevent the formation of frost build up. Because of this temperature variation, frost-free freezers are not recommended for reagent storage. Additionally, it can be helpful to use freezers that retain temperature-logging data to confirm that reagents are kept within the recommended range at all times.

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| *For any feedback or questions regarding this article (Illumina Knowledge Article #5798), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000005798%20-%20Library%20Preparation%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |


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