High-Quality NBR 70 Shore Rubber Sealing Solutions from China Suppliers - Reliable Gas Equipment 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) and good anti-aging and ozone resistance.
- Operating temperature: -40℃~+100℃ (customizable for special formulas) with Shore hardness: 70±5A (customizable).
- Fatigue life >1,000,000 cycles and compression set ≤20% (70℃×22h).
- Precise flow control (response time <50ms) and compatible with various valve types.
- Certified to EN 549 gas valve standards and 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), and 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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Standards & Regulatory Compliance
- 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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Application Cases
- Supplied sealing components for 3 million smart gas meters of China Gas Group.
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Service Commitment
- Free sealing formula optimization solutions.
- In-house mixing plant ensures raw material supply and on-time delivery.
Frequently Asked Questions
What materials are used for your gas valve diaphragms and O-rings?
Our diaphragms and O-rings are primarily made of high-grade NBR 70 Shore rubber. For specific applications like self-closing valves, we utilize a three-layer composite design combining NBR 70 Shore main layer, a fiber reinforcement layer, and a highly corrosion-resistant FKM layer.
What temperature ranges can these gas sealing components withstand?
Our standard NBR 70 Shore rubber components retain elasticity at ultra-low temperatures down to -40℃ and operate continuously at high temperatures up to +100℃. Custom formulas are available for specialized media and environmental demands.
Do your products comply with international gas safety standards?
Yes. Our materials and processes are certified to EN 549 (gas valve standards), GB/T 23658, and CJ/T 447. Additionally, our operations comply with system standard IATF 16949:2016 and ISO 9001:2015, alongside REACH and UL 94 HB flame retardant requirements.
What custom manufacturing capabilities do you offer?
We offer comprehensive customization including sealing groove design optimization, laser marking for traceability, and custom media formula R&D. We can develop molds within 7-10 working days and provide low-volume trial production runs starting at 1,000 units.
How do you ensure the quality and durability of the diaphragms?
Our Gas Self-Closing Valve Diaphragms withstand up to 500,000 fatigue cycles, and our Gas Proportional Valve Diaphragms exceed 1,000,000 cycles. Quality is controlled via liquid nitrogen cryogenic deburring, vacuum vulcanization, 100% vision inspection systems, and batch-wise COA and PPAP documentation.
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