Colourful webbing wound into spools
Backpack webbing soaks water up the moment it rains, and the water climbs along the fibres into the bag itself; the seams on a shell jacket do the same, with the needle holes turning into a channel for water — however well the outer fabric repels, the inside is still wet.
Chemi Tech makes water repellent finishing agents for textile accessories such as webbing and sewing thread, drawn from the water repellent agent KMF-801 series. How a grade is matched depends on the material of the webbing, the weave density and the stitch length of the thread. KMF-801 is the representative grade in this group on the website, in the anti-wicking direction: it takes charge of the capillary channels between fibres so water cannot climb up. Where a seam carries many needle holes, KMF-803 is the better match in the anti-wicking direction. Chemi Tech works from the webbing material and the needle hole density and recommends the water repellent agent that fits.
Advantages of Chemi Tech Water Repellent Agents
Chemi Tech water repellent agent KMF-801 series is built around anti-wicking. Once the webbing has been treated and wetted, water droplets stay on the surface of the fabric, which blocks the capillary uptake channels effectively; the handle does not go stiff after treatment, and the webbing folds and knots smoothly, so wearing comfort is not affected. The product has excellent wash resistance: a good anti-wicking result is maintained after repeated washing, and at the same time it seals the needle holes in the seam, so water no longer seeps through the stitching and the finished item closes the loop on waterproofing as a whole. One-bath compatibility is good as well, with the common softeners, and the existing finishing process does not need major adjustment.
Industry Pain Points and Solutions
The core difficulty in waterproofing webbing and thread is that water does not come through the face of the fabric — it creeps in through the capillary channels. Even where the fabric repels properly, if the wicking channel is not sealed the finished item will still leak.
Testing the fabric and overlooking the webbing is a common omission in the industry. The fabric passes the spray test, but once the webbing meets water the moisture keeps seeping into the bag. Chemi Tech tests the webbing and the stitching together in the assembled state of the finished item, and issues the anti-wicking figures separately.
The next difficulty is water seeping through the needle holes. Stitching forms a continuous capillary channel that seam tape cannot fully cover. Chemi Tech considers the anti-wicking performance of the thread and the stitch length together, sealing the seepage channel from the thread side.
The last problem is the handle hardening after finishing. The repellency meets the target while the webbing goes stiff and hard to knot, and the stitching breaks. Chemi Tech water repellent agents solve these problems in a targeted way — anti-wicking performance and fabric handle are the first indicators we verify.
Typical Conditions and Verification
Customer: an outdoor products enterprise in Fujian, applying it to the water repellent finishing of backpack webbing and shell jacket seams.
This backpack plant had a persistently high rate of rain-related customer complaints: the fabric passed its spray rating, but moisture entered the bag through the webbing and the seams, and after-sales tickets kept piling up. Chemi Tech water repellent agent gave a targeted solution: against the webbing material and the needle hole density, a fitting grade was selected from the KMF-801 series, the webbing was finished by padding, and the thread was run in the same bath at the same time. After switching to this approach, the webbing no longer wicked water in the rain test and the needle holes stopped seeping, and the related after-sales complaints came down with it.
Frequently Asked Questions
With anti-wicking on the webbing, will it fail after a few washes?
There are cases where it does: some finishing agents work at the time but the effect falls away after a few washes. The KMF-801 Chemi Tech supplies to outdoor products plants has been compared for anti-wicking against wash cycles, and it only goes on the machine once the webbing and thread data are held steady.