Our services

Civil engineering construction sites require resilient, complete water stops to protect the inner structure of each building.
Water expansion rubber is essential in mainly tunnels and subways. In Japan, there are few companies that manufacture it.
We are one of those water expansion rubber specialists.
Founded over 65 years ago, we have built our expertise in several fields to provide and develop reliable products that satisfy our clients.

Features of our water expansion rubber

◆Effective at preventing leaks over extended periods.

Prevents leaks over extended periods due to the semi-permanent repetition of the water expansion effect.

◆Exhibits effective water stoppage in any situation

Due to our years of experience in compounding engineering, our products suppress elution, have little variation in expansion rate, are not easily affected by ions in ground water, and exhibit superior water stoppage ability against both salt and alkali water.

◆Superior workability

Due to the soft and rich rubber elasticity and the low stress when under compression, it can easily adhere in corner sections.

Product range

◆Water expansion rubber products

◆Segment seals

◆Segment bolt packing

◆Segment grout hole packing

◆Packing for secondary concrete products

◆Water stop packing for boring work

For solutions not listed here, please contact us for details on other OEM products.