China NBR 70 Shore Rubber Sealing Solutions - Gas Equipment Suppliers & Factory for Reliable Components
I. Core Product Portfolio
Gas Self-Closing Valve Diaphragms
01- 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.
Gas-Specific O-Rings
02- 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.
NBR Rubber Diaphragms for Gas Proportional Valves
03- 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 and compliant with RoHS/REACH.
- Custom services: Sealing groove design optimization, laser marking traceability, special media formula R&D.
Gas Pipe Connector Spigot Seals
04- 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.
Gas-Specific Gaskets
05- Comprehensive specifications for domestic gas pipe connectors, supplied to major Chinese rubber gasket manufacturers.
II. Core Technical Advantages
Material Engineering
01- 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.
Precision Manufacturing Processes
02- 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
Standards & Compliance Summary
01- 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
Condition Adaptation
01- 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).
Rapid Response
02- 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
01- Supplied sealing components for 3 million smart gas meters of China Gas Group.
VI. Service Commitment
02- 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 in your gas self-closing valve diaphragms?
Our gas self-closing valve diaphragms feature an innovative three-layer composite design consisting of an NBR 70 Shore rubber main layer, a fiber reinforcement layer, and an FKM corrosion-resistant layer to ensure excellent tear strength and gas resistance.
What is the temperature range and durability of your gas-specific O-rings?
Our gas-specific O-rings are designed to perform reliably in temperatures ranging from -40℃ to +100℃. They exhibit outstanding compression set resistance, making them ideal for gas meters and pressure regulators.
Do your sealing components comply with international gas industry standards?
Yes, our products are certified to the EN 549 gas equipment standard and meet GB/T 23658 requirements. Additionally, our manufacturing systems are certified under IATF 16949:2016 and ISO 9001:2015.
What are your customization capabilities for special operating conditions?
We can formulate rubber compounds for extreme temperatures (-40℃ to +100℃) and optimize chemical resistance. Our custom formulations are tested to pass ASTM D471-14 n-hexane immersion tests.
What is the lead time for custom molds and trial productions?
We offer rapid prototyping, completing mold development within 7-10 working days. Low-volume trial productions (minimum 1,000 units) can have first samples delivered in just 2 weeks.
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