Hayakawa Rubber – Oto-Kun

Oto-Kun - A Noise Reduction Material Designed for Residential Piping

editor: AK

The drainage pipes in residences or apartments generate noise when water is turned on, toilets are flushed, or water is drained, often disturbing residents, especially during sleep.

Oto-Kun by Hayakawa Rubber Co., Ltd., a Japanese manufacturer specializing in industrial rubber products, is one of the most effective solutions to this issue. It can be applied for various straight piping and joint piping. In addition, lineups a variety of types that can be wrapped before and after installation.

It is available to propose the materials to improve fire resistance.


Image character of Hayakawa Rubber Co.,Ltd.

Structure for Soundproofing Properties

Oto-kun is consists of two materials, "high gravity rubber" for sound insulation and "nonwoven fabrics" for sound absorption. This Double-layered structure greatly reduces drainage noise.




Soundproofing Properties:



*JIS Z8731 Acoustics—Description and measurement of environmental noise

About Hayakawa Rubber

Since its founding in 1919 as a rubber footwear manufacturer, Hayakawa Rubber has been committed to solving social issues through its products for over 100 years, providing innovative value with superior quality.

In response to the rapidly evolving business environment, the company embraces its founding philosophy "Learning from the Past, Challenging the Future" leveraging its technical expertise and entrepreneurial spirit to develop products that meet modern needs while strengthening its organizational capabilities.

They develop and sell functional rubber products primarily used in construction and civil engineering projects. Key products include:
Water-stopping materials for underground concrete structures (e.g., sewer systems)
Expansion joints with water-sealing and seismic-resistant properties for building connections
Waterproofing materials for rooftops
Soundproofing and vibration-damping materials for residential use

Additionally, they develop radiation-resistant rubber for high-radiation environments and high-performance adhesives for LCD displays in smartphones, expanding into new business areas.