VMQ Silicone O-Ring
Compression set is what kills seals prematurely — and VMQ solid silicone consistently delivers values in the 10–30% range, well below EPDM or neoprene alternatives, keeping dishwasher connectors, coffee machine brew-group seals, and water heater gaskets leak-free across thousands of thermal cycles. As a silicone rubber O-ring and precision molded gasket manufacturer, Guangzhou Micune New…
Specifications
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Product Type： |
Molded O-Ring / Static Radial Seal
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Base Polymer： |
Vinyl Methyl Silicone (VMQ)
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Structure： |
Solid
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Color: |
Translucent, Red, White, Black; custom colors available
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Surface Finish： |
Smooth, flash-trimmed
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Standards & Compliance: |
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Hardness: |
40–80 Shore A (standard grade: 60 ± 5 Shore A)
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Tensile Strength: |
≥ 20 kN/m
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Elongation at Break: |
≥ 250%
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Tear Strength: |
≥ 20 kN/m
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Recommended Service Temperature: |
-60°C to +200°C continuous; +230°C intermittent
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Hot Air Aging: |
150°C × 72h: hardness change ≤ ±8 Shore A; tensile retention ≥ 80%
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Low‑Temperature Brittleness: |
Pass at -55°C (standard); pass at -60°C (low-temp flex grade)
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Typical Applications: |
Dishwasher connector seals, coffee machine brew-group O-rings, water heater inlet gaskets, pump and valve seals, appliance fluid fittings
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Description：
For static O-ring seals, tensile strength and tear resistance matter — but compression set is the governing parameter. An O-ring compressed between two mating surfaces must continuously exert contact pressure to prevent leakage. If the elastomer takes a permanent set — losing its elastic memory — that contact pressure drops below the minimum sealing threshold, and the leak begins. VMQ silicone’s polydimethylsiloxane backbone, with its low glass-transition temperature and high backbone flexibility, resists this permanent deformation even after prolonged loading at elevated temperature. Compression set values of 15–20% at 175°C × 70h are routinely achieved on Micune’s optimized peroxide-cure compounds — measurably better than standard EPDM or neoprene grades in the same temperature regime.
Typical Industry Applications：
Proven performance across demanding manufacturing environments.
| Industry | Typical Use Cases |
|---|---|
| Home Appliances | Dishwasher inlet/outlet connector O-rings, washing machine pump seals, steam iron gaskets, water dispenser valve seals |
| Food & Beverage Equipment | Coffee machine brew-group and boiler seals, water purifier filter O-rings, milk frother pump gaskets (GB 4806.16-2025 compliant) |
| Automotive & Motorcycle | Coolant circuit O-rings, EV battery coolant plate seals, windshield washer pump gaskets |
| Construction & Architecture | Solar thermal collector loop seals, underfloor heating manifold O-rings |
| Electronics & Industrial Machinery | Pneumatic valve body seals, hydraulic cylinder static seals in clean-room environments |
Chemical Resistance Table：
| Chemical / Medium | Resistance | Notes |
|---|---|---|
| Water (cold/hot, ≤100°C) | ✅ Excellent | Core appliance use case; no swelling or degradation |
| Steam (intermittent, ≤130°C) | ✓ Good | Peroxide-cure grades preferred; avoid sustained steam above 120°C |
| Dilute acids (pH ≥ 3) | ✓ Good | Suitable for mild descaling agents in coffee machine cycles |
| Dilute alkalis (pH ≤ 11) | ✓ Good | Covers most appliance detergent environments |
| Concentrated sulfuric / nitric acid | ✗ Not recommended | Backbone degradation under prolonged exposure |
| Concentrated caustic (NaOH >20%) | ⚠ Limited | Acceptable for brief contact only; monitor for swelling |
| Animal and vegetable oils/fats | ✅ Excellent | Relevant for food-equipment pump seals |
| Aliphatic mineral oils | ⚠ Limited | Moderate swell; not recommended for continuous oil immersion |
| Aromatic hydrocarbons (toluene, xylene) | ✗ Not recommended | Significant swell and strength loss |
| Chlorinated solvents | ✗ Not recommended | Not suitable |
| Household detergents / surfactants | ✅ Excellent | Dishwasher detergent cycle resistance verified |
| Ethanol (≤ 20% aqueous) | ✅ Excellent | Common in food-equipment sanitizers |
| Ketones (acetone, MEK) | ⚠ Limited | Short contact tolerable; avoid for process seals |
| Ozone / UV / weathering | ✅ Excellent | Siloxane backbone inherently ozone-resistant |
| Silicone fluids and oils | ✅ Excellent | No interaction; stable in silicon-fluid-lubricated assemblies |
In-House Quality Assurance & Testing:
At Micune Rubber, batch-to-batch consistency is guaranteed through our ISO-9001 certified Quality Management System. Every rubber compound and custom extrusion undergoes rigorous evaluation in our dedicated testing laboratory before shipment. We utilise industry-standard baseline testing, including Mooney Viscometers to measure compound viscosity and Torque Rheometers to verify exact vulcanisation characteristics. This ensures every material formulation strictly adheres to your required specifications and processing parameters.
Mooney Viscometer
Abrasive Testing Machine
Burn-in Chamber
