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日本語版 | English

Super Water-Repellent Furoshiki NAGARE official site >> - water repellent -

What is super water-repellent?


The wrapping cloth has evolved through this new Japanese technique.

The water-repellent treatment “dewelry”®[dʒjːəlri] used in the NAGARE fabric is unique to Asakura Senpu, which was established in 1892.

The treatment is also used in the swimwear of top athletes, but was originally developed to be used for baby diaper covers.

We continue to carry out research every day, demanding high quality and performance to withstand more than 50 washes and a manufacturing process that is both friendly to humans and the environment.

We introduce a new kind of wrapping cloth culture to the world, originating from Kiryu, home of the textile industry in Japan, which has flourished since long ago.

“super water-repellent”(superhydrophobe) refers to a high water repellency such that the "water droplet contact angle is greater than approximately 150 to the surface."

The right photo shows a normal water repellent on the upper (contact angle approx. 110°) and the super water-repellent on the lower (contact angle approx. 160°). The larger the contact angle, the more the drop of water becomes spherical and easier to roll.

Super water-repellent principally uses the difference in surface tension between water and fluorine.

This is similar to the Teflon coating on a frying pan.

By adhering fluorocarbons to the filaments of the fabric one by one, we produce a fabric that repels water.

It is different to waterproofing in that because the space between threads is not blocked the fabric breathes well.

It doesn't sweat, so it can be used as a scarf or a throw.

The super water-repellent treatment “dewelry”®, which is unique to Asakura Senpu, uses an eco-friendly water repellent agent that does not include the substance PFOA.

contact angle of normal water repellent
contact angle of super water repellent - dewelry -

dewelry logo


The main feature of the super water-repellent treatment “dewelry”® is that the water repellency is highly durable to washing.

There are slight differences between the types of cloth fabric, but the water repellency will not reduce significantly, even after 50 washes.*

In fact, it is extremely difficult to achieve high durability to washing using PFOA-free water repellent agents, but using our vast experience and know-how, we are able to achieve both high water repellency and durability to washing.

This is something we are proud of.

*greater than or equal to Grade 4 using the JIS L 1092 water repellency test (spray method).