Clean and dry the seal, close a paper strip in several places and compare the resistance.
In short: weak grip locates a poor seal but does not prove the gasket is the cause.
Replace torn, hard or permanently flattened material. If the gasket looks sound, check hinges, latch and frame geometry first.
Symptoms
Visible tears, cracks, or compression damage; the gasket no longer springs back when pressed; a persistent air leak even with the door closed.
The paper-note test
Close a banknote or a strip of stiff paper in the door at one point on the perimeter, then try to pull it out. If it slides out easily, the gasket is not sealing there.
Repeat the test every 200–300 mm around the entire frame — top, both sides, and the bottom — and mark every point that fails. A gasket that grips the paper firmly at every point is sealing correctly.
When to replace the gasket
Replace the gasket if any of the following are true:
- Visible tears or holes.
- Permanent compression — the gasket no longer bounces back when pressed.
- Hardened, brittle, or cracked material.
- Failed paper-note test at more than one point.
- Persistent ice formation despite a working frame heater.
Gasket replacement is a maintenance item a trained operator can usually carry out without a technician. Order the correct profile for your door before starting; replacement gaskets, handles, and hinges are available on request from Frostbox.
Related articles
- Cold room door problems: where to start
- Door won't close or latch
- Door freezing shut (freezers only)
- Operator fix vs. call a technician
- Cold room maintenance schedule
Need the correct replacement gasket profile? Have your cold-room model and serial number (on the data plate) and a photo of the gasket ready, and contact [email protected].
