Overview
The FPM 70 O-Ring (17.2x3.0) is a precision-engineered sealing solution designed for harsh operating conditions. Its fluoroelastomer (FPM/FKM) construction provides superior resistance to heat, oils, and aggressive chemicals, making it a staple in industries like automotive, aerospace, and oil/gas. The 17.2 mm inner diameter and 3.0 mm cross-section adhere to standardized dimensions, ensuring compatibility with common gland designs. The black coloration is typical for FPM O-rings, indicating no additional pigments that might affect performance.
Structure and Working Principle
O-rings function by creating a seal between two mating surfaces, filling the gap to prevent leakage. The FPM 70 variant's elasticity allows it to deform under pressure, maintaining contact even with minor surface imperfections. Its circular cross-section (3.0 mm) ensures uniform stress distribution, while the fluoroelastomer material retains shape over time, reducing the risk of compression set. This design is critical for long-term sealing in dynamic applications like rotating shafts or reciprocating pistons.
Key Features
The FPM 70 material offers exceptional thermal stability, withstanding continuous temperatures up to 200°C and short-term peaks of 250°C. Its resistance to fuels, oils, and acids (e.g., ASTM Oil #3) outperforms nitrile (NBR) or silicone O-rings. With a Shore A hardness of 70, this O-ring balances flexibility and durability, suitable for high-pressure environments. The low compression set (<25% after 22 hours at 200°C) ensures prolonged service life, reducing replacement frequency.
Application Areas
Common applications include automotive fuel injectors, turbocharger systems, and transmission seals, where exposure to gasoline or diesel is frequent. In industrial settings, it seals hydraulic pumps, chemical processing equipment, and semiconductor manufacturing tools. The aerospace sector uses FPM 70 O-rings in jet engine components and fuel line couplings. Its FDA-compliant variants are also found in food processing machinery, though verification for specific grades is recommended.
Maintenance and Precautions
Inspect O-rings regularly for cracks, flattening, or swelling, which indicate material degradation. Replace them during routine maintenance cycles, especially in high-temperature or chemical-exposure scenarios. Avoid using FPM O-rings with ketones, esters, or steam, as these can cause rapid deterioration. Storage should be in a cool, dry place away from UV light. Lubricate with compatible greases (e.g., PTFE-based) during installation to prevent twisting or pinching.
B2B Procurement Guide
When sourcing FPM 70 O-rings, confirm compliance with standards like ISO 3601-1 (size tolerance) and ASTM D2000 (material properties). Bulk purchases (500+ units) typically reduce costs by 20–30%. Request material certifications (e.g., RoHS, REACH) for regulated industries. Lead times vary; domestic suppliers may offer 1–2 weeks, while international orders can take 4–6 weeks. Custom sizes or colors may incur additional tooling fees.