Rubber & Silicone Sealing Rings – Product Description
Overview
Dongguan Chengda Rubber & Plastic Technology Co., Ltd. manufactures high-precision sealing rings (including O-rings, rectangular rings, and custom profiles) designed to prevent fluid or gas leakage in static and dynamic applications. Produced from a wide range of rubber and silicone compounds, our sealing rings deliver reliable performance in pumps, valves, hydraulic systems, pneumatic cylinders, automotive engines, medical devices, and electronic enclosures.
Key Features
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Effective Sealing Performance – Prevents leakage of air, water, oil, chemicals, and gases under various pressures.
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Wide Material Selection – Available in NBR, EPDM, silicone, FKM (Viton®), neoprene, natural rubber, and more.
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Custom Sizes & Profiles – Standard O-rings (AS568, JIS, metric) or custom cross-sections (rectangular, square, X-ring, etc.).
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Excellent Compression Set Resistance – Maintains sealing force after long-term compression.
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Temperature & Chemical Compatibility – Formulations available for extreme heat, cold, oil, fuel, steam, or aggressive media.
Material Options & Typical Applications
| Material | Hardness (Shore A) | Temperature Range | Key Applications |
|---|---|---|---|
| NBR | 40–90 | -30°C ~ +120°C | Fuel, oil, hydraulic systems |
| EPDM | 40–90 | -40°C ~ +130°C | Water, steam, brake fluids, outdoor exposure |
| Silicone | 30–80 | -50°C ~ +230°C | Medical, food contact, high/low temp flexibility |
| FKM (Viton®) | 60–90 | -20°C ~ +200°C | Aggressive chemicals, high heat, automotive fuel |
| Neoprene | 40–90 | -35°C ~ +120°C | Refrigerants, weather resistance |
Applications
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Pumps & Valves – Static and dynamic seals for fluid handling
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Automotive – Engine seals, fuel system O-rings, air conditioning gaskets
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Hydraulic & Pneumatic – Piston seals, rod seals, cylinder sealing rings
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Medical Devices – Silicone sealing rings for syringes, pumps, connectors
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Electronics – Waterproof seals for enclosures, connectors, and switches
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Food & Beverage – FDA-compliant silicone or EPDM rings
Custom Manufacturing Capabilities
Chengda offers complete customization for sealing rings:
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Size & Tolerance – From 1 mm ID to over 500 mm OD, with precision tolerances as tight as ±0.05 mm
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Cross-Section Profiles – Round (O-ring), rectangular, square, X-shaped, D-shaped, or custom
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Material Formulation – Adjust hardness, color, and resistance properties (oil, heat, chemical)
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Rapid Prototyping – Quick sample production using compression or injection molding
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High-Volume Production – Efficient mass production with consistent quality
Quality Control
Every sealing ring batch is inspected for:
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Dimensional accuracy (ID, OD, cross-section)
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Hardness and tensile strength
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Compression set
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Surface finish (no flash, voids, or imperfections)
We follow a full quality control plan from raw material testing to final shipment, ensuring each sealing ring meets your specifications.
Part Numbering or Standard Sizes
We stock common metric and inch O-ring sizes (AS568 series). For custom sealing rings, we manufacture based on customer drawings or samples. Please contact us with your requirements.
Contact Us
For standard or custom sealing rings, request a quote or send your drawing to our sales team. Fast response, competitive pricing, and reliable delivery guaranteed.
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