Shell water repellency under a drop test
Whether water beads and runs off the shell, or wets the weave into a dark patch within a minute.
The reading sequence
3 steps, starting at surface and finish and running to repeat the drop at a seam and at the shoulder. Evidence on this point is read at E1, and 2 of the 3 steps carries a condition that ends the assessment outright.
Set the drop test up so it can be repeated
Get a filmed test with a known drop height on an untouched panel, so the result can be compared with a second test later.
Evidence: E1 — one uncut 60 second video: jacket flat on a table, three drops of water released from a spoon held about 10 cm above the shoulder panel, camera steady throughout
- The spoon, the drop height and the flat panel are all in frame.
- The drops land on a plain part of the shoulder panel, away from a seam.
- The video is cropped so the drop height cannot be read.
- Drops land partly on a seam or on a pocket edge rather than on flat cloth.
- The seller wipes the panel on camera before dropping water onto it.
- Drops are applied to a sleeve that has already been handled through the test.
Read what the drops do in the first thirty seconds
Classify the reaction from the shape of the drops and the colour of the cloth under them, rather than from a word such as waterproof.
Evidence: E1 — the first 30 seconds of the video from step 1, watched at normal speed with the panel filling the frame
- Drops stand as domes with rounded tops and stay separate from each other.
- Cloth under each drop keeps its colour, and the drops run off when the panel is tipped.
- Drops flatten into shallow lenses and darken a thin ring where they touch the weave.
- Two of the three drops bead while the third spreads slightly.
- A drop soaks in and leaves a dark patch wider than the drop itself.
- The cloth darkens within 10 seconds, or water spreads sideways into a stain.
Repeat the drop at a seam and at the shoulder
Find out whether water is held out by the cloth alone or also by the construction, which is what decides performance in rain.
Evidence: E1 — a second 60 second video with three drops on a shoulder seam and three on the sleeve where a bag strap would rub
- Seam and shoulder behave as the flat panel did, with domed drops that stay put.
- The seam does not darken along its length beyond the width of the drops.
- The seam darkens along 5 to 10 mm but stays outside the stitch line.
- Drops on the sleeve shed more slowly than drops on the body panel.
- Water passes a seam within 30 seconds and shows on the inside of the shell.
- The shoulder panel wets out where a strap rubs while the rest of the jacket beads.
Why the thresholds sit where they do
Repellency is a surface property that sellers describe in words and buyers can only check by watching water behave, so the test is specified down to the drop height, the panel and the running time. Reading the first thirty seconds is enough because the cloth gives its answer quickly: a treated shell keeps a drop as a dome, and an untreated one pulls it into the weave. The seam test sits last because it separates two different failures that look the same in a photograph of a wet jacket, namely a shell that has lost its treatment and a construction that never had sealed seams. The 10 cm drop height and the flat panel are the two conditions that make two videos comparable when they are filmed weeks apart.
Common misreads
3 pairs recorded for this point. Each runs in both directions: 2 findings that looks worse than it is, and 1 that looks better.
- looks like Return actually Pass
Drops that flatten into shallow lenses on a new jacket. A light first treatment beads less than a heavy one, and flattened drops that stay on the surface are still holding water out.
- looks like Pass actually Query
A video that starts after the drops have landed. What a drop does in its first two seconds carries the result, and the clip usually opens after that moment has passed.
- looks like Return actually Query
A dark ring where the drop meets the cloth. Water darkens any woven shell at the contact line without soaking through, and the test is whether the patch grows.
Check this point against what you were sent
Insufficient evidence
Nothing decided on shell fabric water repellency yet: 0 of 3 steps have been read.
0 of 3 steps judged
| Step | Reading | Evidence | Stop met |
|---|---|---|---|
| 1. Set the drop test up so it can be repeatedneeds E1 | — | ||
| 2. Read what the drops do in the first thirty secondsneeds E1 | A drop soaks in within thirty seconds and the dark patch keeps growing. A shell that wets out on a table wets out across a shoulder within minutes of rain, and the treatment cannot be restored at home. | ||
| 3. Repeat the drop at a seam and at the shoulderneeds E1 | Water reaches the inside of the jacket at a seam inside thirty seconds. The seam was never sealed or the tape has gone, and no surface treatment applied afterwards will close it. |
Sources and checks
- Public community thread — Threads where a jacket shell absorbed water on the first wet dayn=37
- Editor analysis — 10 cm drop height and a 30 second read chosen so two videos can be comparedno sample
Last checked · next review due · status current.
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