1. Dinghu (Anhui Zhongding Holdings (Group) Co., Ltd.)
   Core advantages: Top 50 global non tire rubber products, national key high-tech enterprise, with cutting-edge production equipment and comprehensive technological coverage.
   Main products: mechanical basic components, automotive parts (such as seals and shock absorbers).
   Industry status: Top 50 enterprises in Anhui Province, participating in multiple national major science and technology projects.
2. Times New Materials (Zhuzhou Times New Materials Technology Co., Ltd.)
   Core advantage: Key high-tech enterprise in Hunan Province, undertaking national “863” and “National Torch” program projects.
   Main products: Polymer composite materials products (such as rail transit damping components, wind turbine blades).
   Technical highlights: Focusing on engineering research and application promotion, collaborating with multiple international giants.
3. Shuangxi (Kaidi Northwest Rubber Co., Ltd.)
   Core advantage: The largest and most comprehensive rubber industry enterprise in the northwest region, and the holder of a nationally protected trademark.
   Main products: hoses, seals, and special rubber products.
   Industry role: Vice Chairman unit of China Rubber Industry Association, participating in the formulation of industry standards.
4. Contitech (Contitech (China) Rubber Technology Co., Ltd.)
   Core advantage: A leading enterprise in the global non tire rubber and plastic technology field, under the German Continental Group.
   Main products: automotive functional components (such as drive belts, hoses), industrial sealing systems.
   Market coverage: Serving multiple industries such as automobiles, machinery, and railways, providing customized solutions.
5. Top (Ningbo Top Group Co., Ltd.)
   Core advantage: Focused on the automotive NVH field (noise, vibration, acoustic roughness) for over 30 years, listed company.
   Main products: rubber shock absorbers, sound insulation components, chassis systems.
   Technical feature: Provide system level NVH solutions for mainstream domestic and foreign car companies.
6. 3537 3537 (formerly the 3537 factory of the Chinese People’s Liberation Army)
   Core advantage: The drafting unit for rubber shoe standards and the earliest liberated rubber shoe production enterprise in China.
   Main products: molded shoes, training shoes, anti-skid shoes, and other military and civilian rubber shoes and boots.
   Historical background: Founded in 1966, it has a profound military industry quality foundation.
7. Haida (Jiangyin Haida Rubber&Plastic Co., Ltd.)
   Core advantage: High tech enterprise, focusing on the research and development of key rubber and plastic components.
   Main products: sealing strips, shock absorbers, automotive interior rubber parts.
   Technical advantage: Providing global sealing and vibration reduction system solutions, with multiple international patents.
8. Pengling (Tianjin Pengling Rubber Hose Co., Ltd.)
   Core advantages: Tianjin Famous Trademark, Listed Company, Expert in Automotive Fluid Pipeline Manufacturing.
   Main products: automotive hoses such as cooling water pipes, fuel pipes, brake pipes, etc.
   Market recognition: Establish long-term cooperative relationships with mainstream car companies and export products to Europe and America.
9. Shuangjian (Zhejiang Shuangjian Rubber Co., Ltd.)
   Core advantage: Zhejiang Famous Brand, Vice President Unit of China Rubber Industry Association.
   Main product: High strength rubber conveyor belt (used in mining, port and other scenarios).
   Technical highlights: The product is industry-leading in terms of wear resistance and tear resistance, and has participated in the formulation of multiple national standards.
10. Sanlis (Zhejiang Sanlis Rubber Co., Ltd.)
    Core advantages: Leading enterprise in the domestic rubber V-belt industry and national high-tech enterprise.
    Main products: rubber V-belts, agricultural machinery transmission belts, automotive transmission belts.
    Export Strength: Zhejiang Province focuses on cultivating export brands, with products covering over 60 countries and regions worldwide.
    Industry Trends and Supplementary Information
    Customization capability: The top ten companies all have a complete industry chain from material research and development, mold design to mass production, supporting personalized customization.
    Expansion of application areas: In addition to traditional automobiles and machinery, the demand for new energy, rail transit, medical and other fields has grown significantly.
    Technical direction: High performance materials such as lightweight, high temperature resistance, and chemical corrosion resistance have become the focus of research and development.
    The above ranking takes into account brand influence, market share, and technological innovation capabilities. In some sub sectors (such as seals and conveyor belts), there are multiple top companies competing, and the actual selection needs to be based on specific needs and regional service advantages.

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A two-dimensional axisymmetric finite element analysis model of FESCO cylinder O-ring was established in ANSYS. By analyzing the influence of preloading shrinkage and driving chamber gas pressure on contact stress and Von Mises stress, it was found that the O-ring can achieve reliable static sealing when the preloading shrinkage is greater than 10% and the driving chamber pressure is lower than 0.5 MPa. When there is relative sliding in the O-ring, based on the previous structural field, the heat source is attributed to frictional heating and mechanical hysteresis heating, and temperature field analysis is conducted. Considering the influence of temperature on contact stress, a secondary coupling is achieved using structure heat structure. It is found that the limited increase in temperature in the contact zone has a small impact on the contact stress of the O-ring, and the decisive factor affecting the dynamic and static sealing performance of the O-ring is the pre compression amount of the O-ring.

A mathematical model was established for O-ring and cylinder under grease lubrication conditions, including Reynolds equation, film thickness equation, load balance equation, and energy equation. Multi grid numerical integration was used to improve the convergence of the entire iteration. The variation trends of lubrication film thickness and friction force of grease with relative sliding speed, compression rate, and gas pressure were calculated through C programming. The simulation results indicate that gas pressure has a relatively small effect on film thickness, but has a significant impact on contact stress. The relative sliding speed has the greatest impact on film thickness and has a relatively small impact on the distribution of contact stress. The film thickness in the contact center area is between 1-2 μ m, which can achieve complete lubrication.

Establish a sliding contact friction model between O-ring and cylinder, simplify the constitutive equation of rubber material and rough rigid surface, derive the mathematical model of hysteresis friction force of O-ring rubber sliding on sinusoidal surface and randomly rough parting surface of cylinder, and build a simulation model in Matlab. The increase in relative sliding speed and gas pressure will lead to an increase in hysteresis friction, with sliding speed playing a dominant role. When the sliding speed is between 0.1m/s and 0.5m/s, the relationship between the hysteresis friction coefficient and the relative velocity is approximately a quadratic parabolic relationship. The obtained variation law has certain engineering value for predicting cylinder friction force.

Keywords: O-ring seal; Contact stress; Rubber friction; Finite Element Method

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Firstly, the materials of marine rubber products should comply with relevant ISO standards or material performance standards specified by classification societies. These standards usually require rubber products to be made of natural rubber or synthetic rubber, and the material should have good properties such as oil resistance, water resistance, acid and alkali resistance.

Secondly, the physical performance requirements of marine rubber products are also very important. The classification society has established physical performance requirements for products such as rubber plates, rubber fenders, rubber pipes, and rubber seals, including hardness, tensile strength, elongation at break, wear resistance, tear resistance, and other indicators. These requirements ensure that rubber products can withstand various complex environmental and stress conditions during ship use.

In addition, the manufacturing process and testing methods of marine rubber products are also strictly regulated. Manufacturers need to produce according to relevant standards and verify the performance and quality of products through various tests. These tests include tensile testing, hardness testing, wear resistance testing, etc., to ensure that rubber products meet standard requirements.

In China, China Classification Society (CCS) is an authoritative organization responsible for formulating and supervising standards for marine rubber products. CCS will continuously update and improve the standards for marine rubber products based on international practices and the actual needs of the shipbuilding industry, to ensure the safety and reliability of ships.

In summary, the standards for customized rubber parts for Chinese ships are a comprehensive system that covers multiple aspects such as materials, physical properties, chemical properties, manufacturing processes, and testing methods. Manufacturers need to produce according to relevant standards and verify the performance and quality of products through various tests to ensure the safety and reliability of marine rubber products.

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ASTM standard:
ASTM is one of the largest international standardization organizations in the world, dedicated to developing and publishing standards for materials, products, systems, and services. For customized rubber products, ASTM has established a series of standards, including requirements for the physical properties, chemical properties, durability, manufacturing processes, and other aspects of rubber. These standards can help manufacturers ensure that their rubber customized products meet specific performance and quality requirements.

For example, The ASTM D3515 standard specifies the physical performance testing methods for vulcanized rubber used in automotive tires and other rubber products. The ASTM D412 standard specifies the testing method for the tensile properties of vulcanized rubber and thermoplastic elastomers.

FDA standards:
If rubber customized products are used for contact with food, they must comply with FDA standards. The FDA is the agency responsible for regulating food, drugs, cosmetics, and medical devices in the United States government. For rubber products in contact with food, The FDA requires them to comply with regulations such as CFR 21 177.2600. These regulations regulate the raw materials, additives, manufacturing processes, and testing requirements of rubber products to ensure that they do not contaminate food or pose a threat to human health.

In addition to ASTM and FDA standards, there are also other organizations and institutions in the United States that have developed standards related to customized rubber products, such as the Rubber Manufacturers Association (RMA) and the Society of Plastic Engineers (SPE). The standards released by these organizations can provide manufacturers with guidance and advice on the design, manufacturing, and testing of customized rubber products.

It should be noted that specific standards may vary depending on factors such as product type, application field, and region. Therefore, when customizing rubber products, it is recommended to communicate with professional manufacturers or suppliers to ensure that the products comply with relevant standards and regulatory requirements.

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Widely applicable fields: Customized rubber parts for automobiles mainly include various types such as seals, shock absorbers, and isolators. These rubber parts are applied in multiple parts of automobiles, such as the body, chassis, suspension system, and engine. They provide functions such as waterproofing, dust prevention, sound insulation, shock absorption, etc., improving the sealing performance and comfort of the car.

Market demand growth: With the rapid development of the automotive industry and the increasing demand for automotive performance from consumers, the market demand for customized rubber parts for automobiles is also constantly increasing. Especially in the field of new energy vehicles, due to the special needs of components such as batteries and motors, there is a stronger demand for customized rubber parts.

The trend of customization is obvious: With the continuous progress of automotive manufacturing technology and the personalized needs of consumers, the trend of customization of automotive customized rubber parts is also becoming increasingly apparent. Automobile manufacturers need to customize rubber parts that meet specific requirements based on vehicle models, configurations, performance, and other requirements.

Intense competition: The market for customized rubber parts for automobiles is fiercely competitive, with major manufacturers including well-known enterprises with strong research and development capabilities and global sales networks, as well as some emerging enterprises. These enterprises need to continuously improve product quality, reduce costs, and enhance service levels in order to win market share.

Environmental protection requirements are increasing: With the increasing awareness of environmental protection and the strengthening of regulations, the environmental protection requirements for customized rubber parts for automobiles are also increasing. Enterprises need to adopt environmentally friendly materials, optimize production processes, and reduce waste emissions to meet environmental requirements.

Overall, customized rubber parts for automobiles play an important role in the automotive industry, with a wide range of applications and diverse functions. With the growth of market demand and the strengthening of customization trends, the market prospects for customized rubber parts for automobiles are broad. However, enterprises also need to face fierce market competition and constantly improving environmental requirements, strengthen research and innovation, and enhance competitiveness.

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