NOK to Exhibit at BATTERY JAPAN (International Rechargeable Battery Expo) Secondary Battery Exhibition

Showcasing Solutions That Support the Wider Adoption of Next-Generation Energy
Low-Dew-Point Grease for Ultra-Dry Battery Manufacturing Environments to Make Its First Exhibition Appearance

NOK Corporation (Head Office: Shibadaimon, Minato-ku, Tokyo; Representative Director , Group Chief Executive Officer: Masao Tsuru; hereinafter referred to as “NOK”) will exhibit at BATTERY JAPAN (International Rechargeable Battery Expo) Secondary Battery Exhibition, to be held at Tokyo Big Sight (Ariake, Koto-ku, Tokyo) from Tuesday, March 17 to Thursday, March 19, 2026.

During the exhibition, NOK will showcase three products for the first time: Low-Dew-Point Grease for ultra-dry battery manufacturing environments, Hydrogen O-Rings, and Water Electrolysis Gaskets.

Based on its dedication to “Essential Core Manufacturing — the manufacture of pivotal products that shape society,” NOK will present EV-related and hydrogen-related products under the theme, “NOK Sealing Solutions Supporting Next-Generation Energy.”

Low-Dew-Point Grease  *Newly developed product / First public exhibit

This newly developed product is designed for ultra-dry environments in the manufacturing processes of lithium-ion batteries and all-solid-state batteries, with dew points ranging from -50°C to -70°C (-58°F to -94°F). It suppresses the increase in frictional resistance in drive components, such as bearings and ball screws, which has been a challenge under ultra-dry conditions. This helps prevent wear on equipment components and extend service life, while also contributing to higher productivity through the stable operation of manufacturing equipment. In addition, because the raw materials do not contain specific metal elements, such as copper (Cu), zinc (Zn), or iron (Fe), which can affect battery characteristics, the product helps reduce the risk of defects in battery performance caused by such elements.

Hydrogen O-Rings  *First public exhibit

These are key components used between electrodes in water electrolysis systems, where they provide gas tightness, insulation, and electrolyte retention. By preventing gas mixing, leakage, and short circuits, they contribute to hydrogen production efficiency and the stable operation of equipment. The integrated seal structure with a resin frame not only makes membrane replacement easier but also helps improve the efficiency of automated assembly and reduce the number of parts. In addition, the use of rubber seals suppresses leakage in high-pressure environments and delivers longer service life compared with conventional resin products. Through joint research with the Fukushima Renewable Energy Institute, AIST (National Institute of Advanced Industrial Science and Technology), NOK is also advancing the optimization of materials and shape to support efficient energy conversion in water electrolysis systems.

Seal Solutions for Cooling Systems (Multichannel Switching Valve Seal / Pipe Fitting Seal)

This seal for multi-channel switching valves combines rubber and low friction material and is designed with a unique shape that achieves both high sealing performance and low torque. It enables smooth switching between flow paths while minimizing energy loss. Reducing the number of surrounding components allows for more efficient use of limited thermal energy. Two types will be showcased: a rotor type and a disc type.

This Piping Fitting Seal flexibly accommodates piping misalignment while ensuring a reliable seal. Its unique construction, featuring an integrated molding of rubber and metal rings, allows for effortless installation by simply press-fitting it into the piping. Engineered to adapt to assembly variations in multi-pipe units- such as complex cooling channels and resin structures, it helps optimize space utilization and enhance design flexibility.

Tracking-Resistant Rubber

Thanks to a proprietary compound formulation developed in-house, this rubber material suppresses tracking phenomena in high-voltage environments. It meets a Comparative Tracking Index (CTI)* of 600, the highest level defined by JIS standards. Molding the material into parts with added sealing functionality contributes to space-saving around inverters and motors while reducing the number of components required. In addition, the base rubber can be customized for specific applications, with options that offer water or oil resistance.
*The CTI (Comparative Tracking Index) indicates the durability of an insulating material against tracking. A higher value means greater resistance to tracking.

Aluminum Anti-corrosion Coated Seal

This gasket is designed for aluminum housings - including those used in electric vehicle units and provides enhanced resistance to saltwater corrosion. The addition of a specialized aluminum anti-corrosion coating fills in the surface roughness of aluminum housings, significantly improving corrosion resistance. Two types of gaskets are available: a rubber gasket and a rubber-coated metal gasket made by bonding rubber to a steel plate.

NOK Group Exhibit Overview

• Theme: “NOK Sealing Solutions Supporting Next-Generation Energy”
• Booth Number: No. S8-1 (Tokyo Big Sight, South Exhibition Hall, Hall 1, 1F)
• Exhibition Website: https://products.nokgrp.com/expo_btj2026.html

BATTERY JAPAN (International Rechargeable Battery Expo) Secondary Battery Exhibition Overview

・Organizer: RX Japan Ltd.
・Dates: Tuesday, March 17 to Thursday, March 19, 2026, 10:00 AM - 5:00 PM
・Venue: Tokyo Big Sight, South Exhibition Hall, Hall 1, 1F
　　　　3-11-1 Ariake, Koto-ku, Tokyo
　　　　Approx. 7-minute walk from Kokusai-Tenjijo Station (Rinkai Line)
　　　　Approx. 3-minute walk from Tokyo Big Sight Station (Yurikamome)
・Website: https://www.wsew.jp/hub/en-gb/about/bj.html