Professional Silicone (VMQ) O-Ring Manufacturer in China - 10+ Years Experience
- Payment Way: T/T, Western Union, Paypal
- Incoterm: EXW, FOB, CIF
- Shipping Way: By Air or Sea
- Manufacturer Place: Ningbo, China
- Delivery Time: 7 - 30 days
- Factory Status: Stocked for Sale
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Description
Silicone O-Rings (also known as VMQ O-Rings) are O-shaped sealing rings made from methyl vinyl silicone rubber, a polymer based on dimethylsiloxane with a small amount of methylvinylsiloxane. They offer excellent performance across a wide temperature range from -50°C to +220°C, resist aging, maintain flexibility in extreme cold, and retain sealing integrity at high heat.
These o-rings provide good chemical stability and are ideal for applications in food processing (FDA compliant), medical devices, pharmaceutical equipment, and electronics. With over ten years of manufacturing experience, we produce custom and standard silicone o-rings in all sizes, from tiny precision seals to large industrial rings.
Specifications
- Material: Silicone / VMQ
- Temperature Range / Rating: -50°C (-58°F) to 220°C (428°F)
- Low Operating Temperature Limit: -50°C (-58°F)
- High Operating Temperature Limit: 220°C (428°F)
- Durometer Hardness Range: Shore A 25-80
- Standard Durometer Hardness: Shore A 60 or 70
- Color: Red (standard), transparent/clear, translucent, white, black, custom
- Cross Section Profile: Round (standard), square, rectangular, X, D, T, custom
- Cross Section Width (CS): 0.5 to 20 mm (0.020 to 0.787 inch)
- Inside Diameter (ID): 0.7 to 2965 mm (0.028 to 116.732 inch)
- Standard Size: AS 568, BS 1806, ISO 3601, DIN 3771, JIS B 2401
- Shelf Life: About 10 years
- Compliance: RoHS, REACH, FDA (available upon request)
- Price Level: Moderate
Resistance Characteristics
The chart below summarizes the typical resistance characteristics of standard Silicone (VMQ) rubber to common media and environmental factors. Ratings are based on industry-standard evaluations: Excellent (recommended), Good (suitable with limitations), Fair (limited use), and Poor (not recommended).
Excellent
- Ozone
- Weather
Good
- Water
- Steam
- Flame
- Compression Set
Fair
- Chemicals
- Acids
- Alkali
Poor
- Oil
- Abrasion
- Tensile Strength
Material Data Sheet
The following table presents the physical properties and fluid resistance performance of our standard Silicone (VMQ) O-ring material, formulated to meet ASTM D2000 M5GE706 specifications. All test results are based on cured compounds tested per the indicated ASTM methods, including heat aging, compression set, and exposure to Ozone, IRM 901 Oil, and IRM 903 Oil.
This is the Material Data Sheet (MDS) for our standard 70 Shore A Silicone compound. Savvy Rubber also offers and routinely tests 25, 30, 40, 50, 60, and 90 Shore A VMQ formulations. If you require data for other hardness grades, please contact our sales team.
| Silicone Shore A 70 Material Data Sheet | |||
|---|---|---|---|
| Test Standard: ASTM D2000 M5GE706 A19 B37 EO16 EO36 F22 | |||
| ORIGINAL PHYSICAL PROPERTIES | TEST METHOD | REQUIREMENTS | TEST RESULTS |
| Hardness Shore A | D2240 | 70±5 | 68 |
| Tensile Strength, MPa (psi) | D412 | 6 (870) min. | 9.1 (1175) |
| Ultimate Elongation, ％ | 150 min. | 325 | |
| Specific Gravity (g/cm³) | — | 1.2 | |
| HEAT RESISTANCE 70H AT 225℃ (A19) | TEST METHOD | REQUIREMENTS | TEST RESULTS |
| Hardness Change, Points | D573 | +10 max. | +5 |
| Tensile Strength Change, % | -25 max. | -7 | |
| Ultimate Elongation Change, % | -30 max. | -20 | |
| COMPRESSION SET, 22H AT 175℃ (B37) | TEST METHOD | REQUIREMENTS | TEST RESULTS |
| Permanent Set % | D395 | 25 max. | 18 |
| WATER RESISTANCE, 70H AT 100℃ (EA14) | TEST METHOD | REQUIREMENTS | TEST RESULTS |
| Hardness Change, Points | D471 | -5 to +5 | -1 |
| Volume Change, % | -5 to +5 | +2 | |
| FLUID RESISTANCE IRM 901 OIL, 70H AT 150℃ (EO16) | TEST METHOD | REQUIREMENTS | TEST RESULTS |
| Hardness Change, Points | D471 | -15 to 0 | -6 |
| Tensile Strength Change, % | -20 max. | -10 | |
| Ultimate Elongation Change, % | -20 max. | -12 | |
| Volume Change, % | 0 to +10 | +5 | |
| FLUID RESISTANCE IRM 903 OIL, 70H AT 150℃ (EO36) | TEST METHOD | REQUIREMENTS | TEST RESULTS |
| Hardness Change, Points | D471 | -30 max. | -15 |
| Volume Change, % | +60 max. | +38 | |
| OZONE RESISTANCE (C32) | TEST METHOD | REQUIREMENTS | TEST RESULTS |
| No Cracks | D1171 | PASS | PASS |
| LOW TEMPERATURE RESISTANCE (F22) | TEST METHOD | REQUIREMENTS | TEST RESULTS |
| Non-brittle after 3 Min at -55°C | D2137 | PASS | PASS |
Test results are typical values for Savvy Rubber standard Shore A 70 Silicone/VMQ compound. Actual performance may vary based on operating conditions, fluid concentration, and exposure time. For critical applications, we recommend sample testing.
Advantages & Disadvantages
Silicone o-rings offer excellent performance in extreme temperatures, working reliably from -50°C to +220°C. They provide superior electrical insulation, good resistance to ozone and oxidation, and maintain flexibility in cold environments. With proper formulation, they can meet FDA, USP Class VI, and other food-grade or medical standards.
However, silicone has limited resistance to oils, fuels, and hydrocarbons, and is not suitable for use with concentrated acids, strong alkalis, or non-polar solvents. While its tensile and tear strength are lower than those of NBR or FKM rubber, its stability, safety, and thermal performance make it the preferred choice for medical, food, pharmaceutical, and electronic applications.
Applications
Silicone o-rings are widely used across industrial, food, medical, and consumer sectors thanks to their wide temperature range and stability. In general industry, they serve as reliable seals in high- or low-temperature environments such as ovens, refrigeration units, lighting systems, and electronic enclosures.
For applications requiring material safety, FDA-compliant and medical-grade formulations are available for use in food processing equipment, pharmaceutical machinery, baby care products, and wearable devices that involve direct food or skin contact.
