Custom NBR 70 Shore Rubber Seals for Gas Equipment - Reliable China Suppliers & Factory
I. Core Product Portfolio
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1. Gas Self-Closing Valve Diaphragms
- Made of NBR 70 Shore rubber (thickness 0.3-1.5mm), with precise pressure response characteristics.
- Passed n-hexane immersion tests to resist gas corrosion, ensuring rapid shut-off under overpressure to protect household gas safety.
- Structural innovation: Three-layer composite design (NBR 70 Shore main layer + fiber reinforcement layer + FKM corrosion-resistant layer) improves tear strength to 22MPa and burst pressure to 0.8MPa.
- Dynamic performance: Withstood 500,000 fatigue cycles (0.05-0.3MPa pressure cycling), response time <0.5 seconds, compliant with CJ/T 447.
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2. Gas-Specific O-Rings
- Available in full specifications (inner diameter φ1mm-φ200mm), using NBR 70 Shore rubber with excellent temperature resistance (-40℃ to +100℃) and compression set resistance. Suitable for gas meters, pressure regulators, etc.
- Produced via fully automated feeding to minimize contamination and ensure stable output.
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3. NBR Rubber Diaphragms for Gas Proportional Valves
- NBR composite material with:
- Excellent gas permeability resistance (natural gas/LPG/coal gas)
- Good anti-aging and ozone resistance
- Operating temperature: -40℃~+100℃ (customizable for special formulas)
- Shore hardness: 70±5A (customizable)
- Fatigue life >1,000,000 cycles
- Compression set ≤20% (70℃×22h)
- Precise flow control (response time <50ms)
- Compatible with various valve types
- Certified to EN 549 gas valve standards
- Compliant with RoHS/REACH
- Custom services: Sealing groove design optimization, laser marking traceability, special media formula R&D.
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4. Gas Pipe Connector Spigot Seals
- Compatibility: PE pipes, steel pipes, aluminum-plastic composite pipes, etc. (interface angles 15°-60°).
- Sealing mechanism: Spigot lip design creates dynamic labyrinth seal, resisting sudden pressure shocks. Passed 1,000 insertion/withdrawal tests with no wear.
- Features: Multi-station precision punching ensures tight fit, meeting explosion-proof requirements. Available in single/double lip designs.
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5. Gas-Specific Gaskets
- Comprehensive specifications for domestic gas pipe connectors, supplied to major Chinese rubber gasket manufacturers.
II. Core Technical Advantages
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1. Material Engineering
- Selected raw rubber combined with proprietary formulas ensures hardness and tensile strength ≥14.6MPa, elongation 298%.
- Tested by National Gas Appliance Quality Inspection Center: Swelling rate <2% for methane/propane.
- NBR 70 Shore properties:
- Acrylonitrile content 33-35% (balances oil resistance and low-temperature performance)
- Mooney viscosity ML(1+4)100℃ 50-60 (ensures processing fluidity)
- Compression stress relaxation <20% (100℃×70h)
- Each batch includes COA (material certificate) and third-party test reports. PPAP documentation available.
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2. Precision Manufacturing Processes
- Cryogenic deburring: Using liquid nitrogen (-35℃ to 95℃) with particle projection, reducing defects compared to traditional methods.
- Vacuum vulcanization: Precisely controls temperature/pressure for uniform cross-linking.
- Vision inspection system: 100% appearance defect screening.
III. Certifications & Compliance
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- System certifications: IATF 16949:2016, ISO 9001:2015
- Material compliance: EU REACH, China Special Equipment Inspection, US UL 94 HB flame retardant.
- Standards: EN 549 gas equipment standard, GB/T 23658 sealing requirements.
IV. Customization Capabilities
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1. Condition Adaptation
- High-temperature: +100℃ continuous operation
- Ultra-low-temperature: -40℃ elasticity retention
- Chemical resistance: Passed ASTM D471-14 Method B n-hexane test (volume change ≤3%, hardness change ±5A after 70℃×70h immersion).
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2. Rapid Response
- Mold development: 7-10 working days
- Low-volume trial production: 1,000 units minimum, first samples delivered in 2 weeks.
V. Application Cases & VI. Service Commitment
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V. Application Cases
- Supplied sealing components for 3 million smart gas meters of China Gas Group.
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VI. Service Commitment
- Free sealing formula optimization solutions
- In-house mixing plant ensures raw material supply and on-time delivery.
Frequently Asked Questions (FAQ)
What materials are used for the Gas Self-Closing Valve Diaphragms?
The diaphragms feature a three-layer composite design composed of an NBR 70 Shore main layer, a fiber reinforcement layer, and an FKM corrosion-resistant layer. This structure provides high tear strength (22MPa) and burst pressure resistance (0.8MPa).
What temperature ranges can your Gas-Specific O-Rings withstand?
Our O-rings are made of NBR 70 Shore rubber, providing excellent temperature resistance from -40℃ up to +100℃, along with high compression set resistance.
Are the diaphragms compliant with international gas standards?
Yes, our diaphragms are certified to the EN 549 gas valve standard, compliant with RoHS/REACH environmental regulations, and meet CJ/T 447 and GB/T 23658 requirements.
How do you ensure the precision and quality of your sealing components?
We utilize cryogenic deburring with liquid nitrogen, vacuum vulcanization for uniform cross-linking, and a 100% vision inspection system to screen out appearance defects.
What customization capabilities do you provide for special media?
We offer custom formula R&D for extreme high/low temperatures, chemical resistance testing (such as ASTM D471-14 n-hexane tests), sealing groove design optimization, and rapid mold development within 7-10 working days.
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