China Reliable Suppliers for Custom NBR 70 Shore Rubber Gas Equipment Sealing Components - OEM Factory
I. Core Product Portfolio
01
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.
02
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.
03
NBR Rubber Diaphragms for Gas Proportional Valves
- 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.
04
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.
05
Gas-Specific Gaskets
- Comprehensive specifications for domestic gas pipe connectors, supplied to major Chinese rubber gasket manufacturers.
II. Core Technical Advantages
01
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.
02
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
✓
Global Standards 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
01
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).
02
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
V
Application Cases
- Supplied sealing components for 3 million smart gas meters of China Gas Group.
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 your gas valve diaphragms?
Our diaphragms are constructed using NBR 70 Shore rubber. For enhanced performance, we also offer a three-layer composite design consisting of an NBR 70 Shore main layer, a fiber reinforcement layer, and an FKM corrosion-resistant layer to optimize tear strength and chemical resistance.
What standards and certifications do your gas seals comply with?
Our gas sealing components comply with various national and international standards, including IATF 16949:2016 and ISO 9001:2015 system certifications, EN 549 for gas valve equipment, GB/T 23658, EU REACH, and US UL 94 HB flame retardancy.
What is the operating temperature range of these rubber seals?
Our gas-specific O-rings and diaphragms are engineered to withstand continuous operating temperatures ranging from -40℃ to +100℃, retaining excellent elasticity and compression set resistance even in extreme environments.
How do you ensure the chemical resistance of your sealing components?
All components are tested by the National Gas Appliance Quality Inspection Center. They successfully pass the ASTM D471-14 Method B n-hexane immersion test, demonstrating a swelling rate of less than 2% for methane and propane.
What is the typical lead time for custom designs and mold development?
We offer rapid prototyping and customization. Custom mold development takes 7-10 working days, and low-volume trial production (with a minimum order quantity of 1,000 units) can deliver initial samples within 2 weeks.
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