The performance of a bonded sealing washer relies on the strength of the metal-to-elastomer bond. KEY-CNC uses a vulcanization bonding process that chemically integrates the rubber sealing layer with the stainless steel substrate, preventing separation under pressure fluctuations and temperature changes.
The stainless steel core provides mechanical strength, compression resistance, and dimensional stability, while the elastomer layer adapts to surface imperfections, fills machining marks, and creates a reliable barrier against liquids, gases, and contaminants.
This integrated design reduces the need for separate gaskets or sealants, simplifying assembly and minimizing leakage risks. After molding, each washer undergoes precision deburring to ensure smooth edges and uniform sealing contact.
Seal Elastomer Selection - Choosing the Right Compound
The right elastomer ensures long-term sealing performance. An incompatible material may swell, harden, or degrade when exposed to certain fluids, temperatures, or environments.
| Elastomer | Temperature Range | Best Applications | Limitations |
|---|---|---|---|
| NBR (Nitrile) | -30°C to +120°C | Oils, fuels, hydraulic fluids | Limited ozone and weather resistance |
| EPDM | -50°C to +150°C | Water, steam, brake fluid, outdoor use | Not suitable for oils and fuels |
| Silicone | -60°C to +200°C | Food, medical, extreme temperatures, UV exposure | Lower tear resistance |
| FKM (Viton) | -20°C to +200°C | Chemicals, fuels, high-temperature systems | Higher material cost |
| PTFE (Teflon) | -200°C to +260°C | Corrosive media, gases, food & pharma | Low elasticity, requires higher clamping force |
KEY-CNC provides engineering support to match elastomer materials with your operating conditions, including media compatibility, temperature range, pressure cycles, and sealing requirements. Custom grooves or retaining features can also be added for secure elastomer positioning.
Sealing Washer Applications
Hydraulic & Pneumatic Systems
Plumbing & Water Systems
Automotive Fluid Systems
Outdoor Electrical Enclosures
Food & Pharmaceutical Equipment
Medical Device Assemblies
What Sets a Sealing Washer Apart from Standard Flat Washers?
Many engineers choose precision flat washers when a sealing function is also required. Unlike standard washers that only distribute clamping loads, sealing washers prevent fluid and gas leakage around the fastener interface.
A bonded sealing washer combines a metal carrier with an elastomer seal. When compressed, the elastomer fills surface gaps to create a reliable 360° seal, while the metal backing controls compression and prevents over-extrusion.
For applications needing both load distribution and sealing, such as thin panels or stainless steel fender washers in wet environments, sealing washers offer a practical combined solution. Proper selection depends on fastener size, sealing material, and operating conditions.
Frequently Asked Questions
Can you provide custom elastomer compounds beyond NBR, EPDM, silicone, FKM, and PTFE?
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Yes. We can supply specialized materials such as HNBR, Aflas, and FFKM for extreme chemical, temperature, or performance requirements. Our team can recommend the right compound based on your application.
How do you ensure the metal-to-elastomer bonding quality?
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We verify bond reliability through peel strength and pressure cycling tests. For critical applications, batch test reports can be provided to confirm sealing performance and bond integrity.
Are bonded sealing washers reusable?
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Most bonded sealing washers are designed for single use. Compression set after installation may affect resealing performance. For repeated assembly, we recommend replaceable seal designs.
What information is needed for a quotation
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Please provide dimensions (OD, ID, thickness), sealing media, temperature and pressure requirements, material preferences, certifications, quantity, and surface finish requirements.
Can you manufacture sealing washers for automotive mass production?
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Yes. We support prototypes and high-volume production with optimized tooling and molding processes to ensure consistent quality, competitive cost, and reliable delivery.
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