Traditional submersion storage has liquid nitrogen sitting in the sample space. While it works to keep samples frozen, it has some key drawbacks when compared with dry storage.
“Dry storage” was developed and patented by the CEO and President of Custom BioGenic Systems in 2000. Our Isothermal freezers are the only true dry storage system on the market, and three key features are what separate it from vapor and traditional storage.
Safer for User
With dry storage there is no liquid nitrogen contained in the sample space. Instead, a jacketed wall in the freezer stores the liquid nitrogen to keep samples at the appropriate temperature. This eliminates any contact between the user and splashing liquid nitrogen, therefore avoiding the injuries that could result (such as cold burns that range from surface damage to deep tissue burns).
When working with cryogenic equipment safety is crucial, and dry storage puts user safety first.
Retrieval of Samples
Dropping the occasional sample during retrieval is inevitable. Reaching down into a tank full of liquid nitrogen not only poses safety risks but also makes finding fallen samples difficult. Retrieving samples in dry storage tanks is much easier, not to mention safer.
Reduces Risk of Cross-Contamination
Submersion storage has samples floating in a collective soup. Despite the freezing temperatures, many pathogens can survive in the cryogenic environment and travel freely around the liquid nitrogen. Vials may shrink due to the cryogenic temperatures, allowing liquid containing pathogens to leak in and contaminate the samples.
Since dry storage has no liquid sitting in the sample space, the risk of cross-contamination is nearly eliminated. Samples are extremely valuable and often hard to replace, so keeping them safely preserved from the get-go is imperative in research laboratories.