surface functional design technology

Advancing Low-Friction Sealing with Polymer Brushes

Pursuing higher performance with advanced surface treatment technology. The company’s core sealing products, including oil seals and O-rings, are expected to deliver both airtight performance that prevents leaks and low friction that improves energy efficiency in machinery. These two qualities are often in tension, but NOK continues to refine both through ongoing R&D focused on surface functionality, materials, and component design, centered at its Shonan R&D Center in Fujisawa, Kanagawa. In recent years, this work has expanded to include polymer brushes, a surface treatment technology gaining attention worldwide. Rather than focus solely on short-term gains, NOK is pursuing mid to long-term research to improve the performance of its sealing products.

Handling Opposing Functions: Oil Seals and Surface Design

A major independent automotive parts manufacturer highly regarded for its technical capabilities. NOK is a key supplier to all Japanese automakers. Its particular strength lies in oil seals, the product the company was founded to manufacture. Used in engines, gearboxes and hydraulic equipment, oil seals must prevent the leakage of oil, water and gases while simultaneously circulating fluids on the sealing surface to enable lubrication. This low level of friction saves energy. Although they may appear to be simple rubber rings, NOK is constantly upgrading these oil seals through improvements in surface functionality, material selection and structural enhancement when in contact with rotating shafts.