Cut the old seal cleanly, photograph the cut end straight-on next to a ruler, and measure the overall width and height plus any wall thickness, channel width or grip range with a caliper – without squeezing soft sponge. Add the application, material and quantity; that is enough to match or develop a profile.
1 · Make a clean cut
Use a sharp blade and cut square across the seal. A torn or angled end makes the section impossible to read.
2 · Photograph the cut end
Lay the piece on white paper, end facing the camera, with a ruler or caliper in the picture. Shoot straight on, in good light, with the section filling the frame.
3 · Measure the key dimensions
| Dimension | Needed for |
|---|---|
| Overall width and height | Every profile |
| Wall thickness of hollows | D, P and bulb seals |
| Channel width / grip range | U-channel and edge trim |
| Base width | Truck seals, pile seals, slot-in strips |
| Lip length and angle | Wiper and sweep seals |
Measure sponge with the caliper jaws just touching – do not squeeze. If you cannot measure, a photo with a ruler is enough to start.
4 · Add the context
- Where the seal is used and what it seals against
- Indoor / outdoor, temperature, contact with oil, water or food
- Hardness or softness if known (see Shore A guide)
- Colour, quantity in metres, packing
5 · Or send a sample
A 20–30 cm piece of the old seal posted to us is the most reliable route. We measure it and reply with a matching or new profile.
Need a seal for this?
Send your section, gap size or a photo of the old seal – Dora replies usually within 2 hours. Custom extruded & moulded rubber parts are available from 10 m.