[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

As the new year begins, I would like to extend my heartfelt congratulations on your continued prosperity. I sincerely appreciate your exceptional support throughout the year. This is the STJ Group (Santelecom Japan, STJ Rentec). Now, I am pleased to announce that we will be opening our "Transceiver & Smartphone Rental Shop" simultaneously at three locations nationwide on January 26 (Monday)! ■ List of Services to be Offered - Same-day pickup/return of rental equipment - Usage explanations and demonstrations of rental equipment - Wireless solutions consultation desk - Mobile BPO service counter As a special promotion to celebrate the opening of the rental shop, we are currently running a special price campaign for picking up rental equipment at the shop! For more details, please contact us!

【Notice of Year-End and New Year Holidays】 Thank you very much for your continued support. Our company will be closed for the year-end and New Year holidays as follows: Holiday Period: Saturday, December 27, 2025 – Sunday, January 4, 2026 Please note that inquiries and orders received during the holiday period will be addressed sequentially starting from Monday, January 5, 2026. We apologize for any inconvenience this may cause and appreciate your understanding.

We would like to inform you about our participation in the IT Trend EXPO 2026 Spring. 《Exhibition Information》 With the concept of "New encounters will change tomorrow's work," one of the largest online exhibitions in the industry will be held. NTT TechnoCross will exhibit in the Human Resources Comprehensive category. We have prepared numerous discussions and sessions featuring special guests who are active on television, allowing even those who are usually busy to efficiently gather information on products and services related to IT and DX. Additionally, the first 10,000 participants will receive a 500 yen Amazon gift card. Please apply early. 《Exhibition Overview》 March 3 (Tuesday) to March 7 (Saturday), 2026, online (free: pre-registration required) 《Participation Application》 https://it.expo.it-trend.jp/key/opl7kgdj *Please apply (free) from the "Receive Ticket / Proceed to Participation Registration" link at the above URL.

The TV commercial "What Will You Do in the New Era?" featuring model and actress Akane Horita will begin airing on December 26, 2025. This work expresses the desire of Tokei Densan to respond to the diverse needs of various industries in today's society, where new technologies, such as the expansion of the AI market, are competing with each other, and to nurture and blossom our customers' futures. Please pay attention to Akane Horita, who is dressed in stylish outfits, listening to the concerns of the target audience and offering support. # CM Overview Title: "What Will You Do in the New Era?" (30 seconds / 15 seconds) CM URLs 30 seconds: https://youtu.be/y_lMs0HRj3w 15 seconds: https://youtu.be/egpzMfh8Kok

Thank you very much for your continued support. We would like to inform you that our company will be closed for the year-end and New Year holidays as follows: Year-end and New Year holiday period: December 27, 2025 (Saturday) to January 4, 2026 (Sunday) We apologize for any inconvenience this may cause and appreciate your understanding. *Please note that inquiries made through our website will also be responded to after January 5, 2026 (Monday).