Standard O-Ring

An O-ring is a simple yet essential sealing component: a loop of elastomeric material with a circular cross-section, designed to be seated in a groove and compressed between two or more parts, thereby forming an effective seal at the interface. 

Due to its shape, the O-ring can accommodate both static and dynamic sealing applications, resisting fluid or gas leakage, and is widely used across various industries, from automotive to food processing.

Size Standards for Standard O-Rings

To ensure interchangeability, reliability, and manufacturing efficiency, O-Ring sizes are governed by internationally recognised standards. The main standards include:

• ISO 3601
• AS568
• DIN 3771
• JIS B2401

Because of these standards, we can reliably offer standard sizes (ID × CS) in both inch and metric systems, enabling you to select from a broad catalogue of standard O-rings rather than custom-only dimensions.

Materials Used for O-Rings

Selecting the right material is critical for performance, compatibility, lifespan and cost. Common elastomer and polymer materials include:

• Perfluoroelastomer （FFKM）
• Fluorocarbon elastomers (FKM / Viton®) 
• Fluorosilicone (FVMQ)
• Silicone rubber （VMQ）
• Hydrogenated nitrile rubber (HNBR)
• Nitrile rubber (NBR / Buna-N) 
• Ethylene-propylene rubber (EPDM) 
• Neoprene（CR）
• Natural rubber (NR) 
  
  

Special materials (FFKM, AFLAS, PTFE-encapsulated, etc) for ultra-high-purity or extreme chemical/temperature environments.

Furthermore, for each material, we maintain strict control of hardness (durometer), shrinkage, compression set, elongation, and physical/chemical compatibility.

Certifications & Standards We Meet — Industry-by-Industry

As our O-rings serve multiple industries, we adhere to the relevant certifications and standards listed below to ensure that our products meet the performance, safety, hygiene, and regulatory requirements of each sector.

Food, Beverage & Pharmaceutical Applications

• Materials and compounds that comply with FDA 21 CFR 177.2600 for rubber articles intended for food contact. 
• Compliance with EC 1935/2004 and relevant EU food-contact regulations, where applicable. 
• Compliance with LFGB regulations.
• Compliance with WRAS Water Regulations Advisory Scheme is a compliance certification scheme based on British water regulations, applicable to all products that come into contact with drinking water
• Certifications such as NSF International 61 (for potable water contact) and sanitary standards such as 3‑A Sanitary Standards Inc. (for dairy & food equipment), when required. 

Oil & Gas, Chemical, Pipeline, Pump & Valve Industries

Use of elastomer compounds qualified for high pressure, sour gas, extreme temperature service, and materials where applicable reference industry standards such as ISO 23936‑2 (Elastomeric seals for oil & gas) and NORSOK M‑710.

Full traceability of material lot, test reports for rapid gas decompression (RGD), sour-service ageing, dimensional compliance and quality documentation for critical applications.

Automotive, High-Speed Train / Public Transportation, Electronics

Automotive industry supply chains: compliance with IATF 16949 or equivalent automotive quality management systems for O-ring production, ensuring consistency and supplier control.

Materials complying with REACH, RoHS, and other hazardous substance regulations where electrical/electronic or public-transportation use demands.

For electronics enclosures or train/rail systems,
We provide materials that meet required flammability, smoke/toxicity, UL listings (for instance, UL 94 V0 where applicable), EN45545, NFPA 130, DIN 5510, NFF 16-101/102, and long-life dynamic sealing performance.

General / Across-Industry Quality & Standards

All our manufacturing is under a robust quality management system (ISO 9001 or equivalent) with full batch traceability, material certi.