[Free Sample Gift] Comparison of Rubber Sponges: NR, NBR, CR, EPDM

Various types of rubber-based sponges, commonly known as rubber sponges, have been categorized by their applications, usage environments, and excellent performance (strength, waterproofing, heat resistance, chemical resistance, etc.).

NR series (Natural Rubber) Rubber Sponge - Characteristics Has the most rubber-like elasticity. Good mechanical strength and abrasion resistance. Weak against heat and ultraviolet rays. - Main Applications Various tires, footwear, hoses, belts, vibration-damping rubber, industrial gaskets, etc. NBR series (Nitrile Rubber) - Characteristics Oil resistance is its greatest feature. Excellent gas permeability. Poor weather resistance and cold resistance. - Main Applications Oil seals, gaskets, packing, oil-resistant hoses, etc. CR series (Chloroprene Rubber) - Characteristics Has average properties such as weather resistance, oil resistance, and heat resistance. Excellent flame retardancy. - Main Applications Wire insulation, automotive parts, belts and hoses, window frame rubber, adhesives, etc. SR series (Silicone Rubber) - Characteristics High heat resistance, cold resistance, and weather resistance. Excellent electrical properties and non-stickiness. Physiologically safe material. Mechanical strength is inferior. - Main Applications Food-related, medical device-related packing, gaskets, industrial rolls, etc. EPDM series (Ethylene Propylene Rubber) - Characteristics Excellent ozone resistance, weather resistance, chemical resistance, heat resistance, and cold resistance. - Main Applications Window frames, automotive parts, electrical wires, outdoor cushioning materials, and shock-absorbing rubber materials, etc.

• Rubber

It is a clean polyolefin-based special foam with low outgassing that does not use chemical blowing agents. It is recommended for precision equipment and measures against sick house syndrome.

Due to the supercritical nitrogen gas foaming method, the foam has very low outgassing of substances such as siloxane, ammonia, formaldehyde, and sulfur, making it safe for use in measures against sick house syndrome and in precision equipment such as electronic circuits.

• Composite Materials

For anything related to sponges (foam), please leave it to Konan Co., Ltd.

Konan Co., Ltd. processes and sells various industrial materials, industrial supplies, and lifestyle-related products, primarily using sponge (foam) and other materials, and is making daily progress to be of service in a wide range of industries. Moving forward, we aim to become a company that can create better "monozukuri" (manufacturing) together with our customers by leveraging the technology and experience accumulated since our founding, while also providing various proposals through new ideas and creativity. 【Business Activities】 ○ Processing and sales of sponge (rubber, polyethylene, urethane) in general, rubber sheets, films, double-sided tape, etc. ○ Sales of various extruded and molded products, among others. For more details, please contact us or download the catalog.

• Rubber
• Composite Materials

Introducing sound-absorbing urethane foam. *Sample sponge book available.

Due to the special formulation of the urethane foam, it has sound-absorbing properties superior to general-purpose urethane foam. There are sound-absorbing types (general type, coated, flame-retardant) and vibration-damping types available. Manufacturer Inoac Corporation Representative part numbers F-2/F-4/F-6/F-9 *For more details, please refer to the PDF materials or feel free to contact us.

• Engine parts
• Rubber
• Cushioning material

JOHNAN has released a video that clearly explains the implementation technology for stretchable films, which are expected to be utilized in wearable devices and medical equipment. In the video, you can see how the film, which has excellent elasticity, stretches and contracts. Please check our high technological capabilities and the flexible characteristics that are useful for product development. We hope this will help you generate new ideas in product development. ▼You can watch the video here [Link to the implementation page for stretchable films] https://www.johnan.com/dms/mounting/filmdevic/stretchable/

Thank you very much for your continued support. We sincerely apologize for the inconvenience, but our company will be closed for summer vacation during the following period. 【Closure Period】 From Saturday, August 9, 2025, to Thursday, August 14, 2025. We will resume normal business operations on Friday, August 15. We appreciate your understanding during this time and apologize for any inconvenience caused.

"Because it's an invisible place, we won't overlook it." Japan's climate is characterized by high temperatures and humidity, and particularly after typhoons and heavy rains, the conditions can be harsh for homes. It's not just the roofs and exterior walls that are affected by rain and wind. The area beneath the floor is actually the most susceptible and often overlooked point. This time, we will explain the "checkpoints for under the floor" that should be confirmed after a typhoon or heavy rain, the "responses" if abnormalities are found, and measures for preventing recurrence. [Table of Contents] ■ Why is underfloor checking necessary? ■ Checkpoints to confirm after a typhoon or heavy rain ■ Responses when damage is discovered ■ Points for preventing recurrence ■ Suggestions from Seihou Products ■ Summary Please be sure to read the [related materials] and [related links]. ↓ ↓ ↓

Explosion-proof motors available in stock We will deliver within 7 days to meet your delivery schedule. 【What is an explosion-proof motor?】 In factories and plants, flammable gases and vapors are present. When these mix with air and come into contact with an ignition source, an explosion or fire can occur. This motor is designed with measures to eliminate such ignition sources. 【Available stock models】 ■ Pressure-resistant explosion-proof motors, explosion-proof grade d2G4 - Foot-mounted type, output 0.4 to 3.7 kW, 4 poles - Flange type, output 0.4 to 0.75 kW, 4 poles ■ Increased safety explosion-proof motors, explosion-proof grade eG3 - Foot-mounted type, output 0.2 to 0.75 kW, 2 and 4 poles - Flange type, output 0.2 to 0.75 kW, 2 and 4 poles

As part of the "Hometown Ibara Future Creation Human Resource Development Project," we welcomed local elementary and middle school students to the special summer program "Ibara Job Exploration Tour 2025," a collaboration between the Ibara City Chamber of Commerce and the Corporate Branding Committee. We conducted a presentation that clearly and enjoyably introduced how our technology supports society, allowing the children to learn about the appeal of manufacturing and the significance of working while interacting with actual devices and products. Through this initiative, we hope to deepen our connection with the community and nurture the curiosity of the children who will carry the future. We sincerely thank everyone who participated, as well as all those involved in planning and organizing the event.