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KOWaterproof thermal labels are made for environments where a paper label would dissolve or smudge. The two parts that make them waterproof are the synthetic face, usually PP or PET film, and a thermal transfer print with a resin ribbon.
A standard direct thermal paper label is not waterproof: the paper absorbs water and the heat-sensitive image darkens or washes out. That is why 'waterproof thermal' almost always means thermal transfer on a synthetic film.
Synthetic face stock
PP and PET films do not absorb water and resist tearing, so they survive freezer condensation, chemical exposure and outdoor rain. PP is the economical choice for most wet applications; PET is stiffer and used for asset tags and labels that must last.
Resin ribbon printing
Thermal transfer with a resin ribbon bonds the image into the film, giving a print that resists water, solvents and abrasion. Wax or wax-resin ribbons are cheaper but do not give the same durability, so resin is specified when the label must stay legible.
Adhesive in wet conditions
A waterproof face is only useful if the adhesive also holds. Freezer-grade and wet-surface adhesives are formulated to bond through condensation and low temperatures, which is what keeps the label attached when the surface itself is wet or frozen.
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FAQ
Are direct thermal labels waterproof?
No. Direct thermal images fade and the paper softens when wet. For waterproof labels use thermal transfer printing with a resin ribbon on a synthetic face.
Will they survive the freezer?
Yes, when built for it: a synthetic face, a resin ribbon and a freezer-grade adhesive. This combination is standard for frozen food and cold-chain labelling.
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Related Keywords
Tell us the environment the label must survive; we will specify the film, ribbon and adhesive.