Top 10 O-Ring Manufacturers in China 2025

Haining Chaoyue Seals Co., Ltd located in Haining City, Zhejiang Province, which near the city Shanghai(120KM)and Hangzhou(90KM)). Haining Chaoyue Seals Co., Ltd. manily engages in the field of providing the Nonstandard Custom made Molded Rubber. We are small-sized enterprises in Zhejiang China(1200square meter, 20 people). Based on the idea of developing the level of national rubber industry. Our Advantage: We provide service of rubber manufacturing technology consultation and product R & D (OEM & ODM)

A. Cheap mold fee

B. Rubber molding for kind of size / shape, possible to make.

C. Custom personalise logo accept

D. Over 10000 kind of Custom Molded Rubber establishment and the consummation.

E. Various materials: Silicone, EPDM, NBR, FKM (Viton), HNBR, NR, Neoprene (CR), SBR, MPU, etc

F. Different hardness: 10 to 90 Shore A

G. Various colors: translucent, black, white, blue, green, red, etc.

H. Our components and materials are used: sealing, insulation, silencers, protect,etc

Freudenberg Sealing Technologies (NOK-Freudenberg)
Specialization: The gold standard in sealing technology. Their Chinese plants produce world-class O-rings for the most demanding applications in automotive, aerospace, and industrial machinery. They lead in advanced material compounds (FKM, FFKM, HNBR) and simulation-aided design.
Key Strength: Unmatched R&D, complete material science mastery, and a global quality system. The top choice for mission-critical and precision sealing solutions.

Specialization: Another global leader with extensive Chinese manufacturing. They excel in high-performance elastomer seals for extreme environments (high temp, aggressive chemicals, ultra-clean). Strong in hydraulics, oil & gas, and life sciences.
Key Strength: Deep application engineering, proprietary material grades (e.g., Isolast® for semiconductors), and a comprehensive portfolio of standard and custom profiles.

Specialization: Parker's Chinese facilities produce a vast range of Parflex® and other brand O-rings and sealing solutions. They are particularly strong in aerospace (AS/EN standards), semiconductor, and fluid power applications.

Key Strength: Global brand trust, stringent aerospace-quality manufacturing processes, and strong technical support network in China.

Specialization: A Chinese automotive components powerhouse and one of the world's largest suppliers of rubber seals. They manufacture a huge spectrum of O-rings and custom molded seals for vehicles, construction machinery, and new energy (EV battery cooling systems).
Key Strength: Vertical integration from rubber compounding to precision molding, massive R&D investment, and dominant position in the Chinese automotive supply chain.

Specialization: A fast-growing, technology-focused Chinese manufacturer. They specialize in high-performance and custom-engineered seals for challenging applications in pharmaceutical, food & beverage, and chemical processing.
Key Strength: Strong in cleanroom manufacturing, certifications (FDA, USP Class VI, 3-A), and tailored solutions for sanitary and ultra-clean processes.

Specialization: A major specialist in fluorocarbon (FKM/Viton®) and silicone (VMQ) O-rings. They cater to industries requiring high chemical and temperature resistance, such as petrochemical, valve manufacturing, and new energy.
Key Strength: Expertise in compounding and molding high-performance fluoropolymers, offering a strong domestic alternative to imported high-end seals.

Specialization: A versatile manufacturer with a broad catalog of standard (AS568, JIS, DIN) and metric O-rings in common materials (NBR, EPDM, CR, Silicone). They are a reliable source for distributors, MRO, and general industrial use.
Key Strength: Extensive inventory of standard sizes, quick turnaround on custom molds for small batches, and competitive export pricing.

Specialization: Focuses on precision seals for heavy industry and marine applications. They produce robust O-rings for hydraulic cylinders, shipbuilding, wind power, and mining equipment, often with proprietary anti-extrusion designs.
Key Strength: Engineering support for large-diameter and complex cross-section seals, with strong capabilities in bonding rubber to metal for composite seals.

Specialization: A niche innovator specializing in specialty O-rings for medical devices, water treatment, and connectors. They are experts in hydrophilic coatings, conductive silicone, and other functionalized elastomers.
Key Strength: Innovation in surface modification and specialty materials, serving high-tech electronics and medical OEMs with unique performance requirements.