Why Labels Fall off Cryovials in Liquid Nitrogen
Editor:adminClick：
Time:2026-10-27 17:25
One problem recurs in biobank management: a label that adheres perfectly at room temperature lifts, curls or disappears entirely after time in a liquid nitrogen tank. This is rarely carelessness; it is the predictable behaviour of materials under extreme cold.
Three mechanisms are mainly involved. First, adhesive failure: ordinary pressure-sensitive adhesives lose flexibility as temperature falls, becoming glassy and brittle with sharply reduced bond strength. Second, differing thermal expansion: the label facestock, the adhesive layer and the vial material each contract by a different amount when dropped from room temperature to −196 °C, creating interfacial stress that lifts the edges. Third, moisture: if condensation or trace water remains on the vial when the label is applied, it freezes and forms an ice layer between label and wall, effectively inserting a release layer.
The consequences are often underestimated. Once a sample loses its label, its identity becomes difficult to trace, and since cryogenic storage is measured in years, reconstruction after the fact is rarely possible. The research value of such a sample is greatly reduced.
Solutions can be approached from materials and handling. On materials, labels designed for cryogenic use are preferable, typically with synthetic facestocks such as polyester and adhesives formulated for deep-cold service, printed by a compatible method such as thermal transfer with a resin ribbon. In handling, the vial surface should be dry and clean before application, firm even pressure applied afterwards, and the label left at room temperature for a while so the adhesive can wet out fully. Where space allows, wrap-around application or a transparent over-laminate reduces edge lifting. Labelling boxes and racks as well provides redundancy if an individual label fails.
Management practice matters too: a clear numbering scheme, paper and electronic records maintained in parallel, number checks at every transfer in and out, and regular audits. Writing directly on the vial with a marker is less reliable, as markings may be removed by solvents or detach over long periods in cold.
What cryopreservation must preserve is not only the sample, but the identity bound to it.
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