Product Overview
Reliable custom rubber parts for industrial applications
Quick Answer
Red silicone O-rings are flexible molded sealing rings for industrial sealing, equipment assembly, repair kits and OEM applications. Inner diameter, outer diameter, cross-section, Shore A hardness, dimensional tolerance, packaging and documentation options can be customized according to drawings, size lists or physical samples.
Red silicone O-rings are flexible molded sealing rings used for groove-based static and selected dynamic sealing applications. The red color supports visual identification during storage, assembly and maintenance. Inner diameter, outer diameter, cross-section, Shore A hardness, dimensional tolerance, packaging and documentation requirements can be customized according to drawings, samples or application conditions.
Red Silicone O-Rings — Color-Coded Silicone Sealing Rings for Food, Medical, and Industrial Applications
Product Overview
Red silicone O-rings are flexible sealing rings made from silicone rubber and pigmented in red for easy visual identification, inventory control, and product differentiation. They are widely used in food equipment, medical devices, laboratory instruments, appliances, and industrial assemblies where temperature resistance, flexibility, and a clean appearance are important.
Silicone O-rings are popular because they maintain elastic sealing performance across a broad temperature range and can be supplied in vivid colors without losing their core functional properties. Red is one of the most common color codes for silicone seals, especially in regulated or high-temperature applications.
Key Technical Specifications
| Parameter | Typical Value / Range |
|---|---|
| Material | Silicone rubber (VMQ) |
| Color | Red |
| Hardness | Commonly 40–90 Shore A |
| Temperature Range | About -75°F to 400°F (-59°C to 204°C); higher grades may reach 500°F (260°C) |
| Cross Section Sizes | Standard AS568, metric, and custom sizes |
| Compliance Options | FDA, 21 CFR 177.2600, USP Class VI, LFGB, RoHS, REACH |
| Applications | Food, medical, industrial, electronics, appliance, OEM |
| Seal Type | Static sealing ring; some dynamic use depending on design |
What Are Red Silicone O-Rings?
Red silicone O-rings are circular elastomer seals that are manufactured from silicone and colored red for quick identification. The color does not change the sealing principle, but it is very useful for distinguishing silicone from other materials such as NBR, EPDM, or FKM in mixed inventory environments.
They are commonly selected when users need a seal that is both functional and easy to recognize during assembly or maintenance. In many operations, red is also associated with silicone or high-temperature service.
O-Ring Size Measurement
The image you provided shows the three key measurements used to define an O-ring size: ID, OD, and CS.
1. Inner Diameter (ID)
The inner diameter is the distance across the opening of the O-ring from one inner edge to the opposite inner edge. It is the most common value used to identify O-ring size.
2. Outer Diameter (OD)
The outer diameter is the full distance across the outside of the O-ring from one outer edge to the opposite outer edge. It equals the inner diameter plus twice the cross section.
3. Cross Section (CS)
The cross section is the thickness of the O-ring material itself, measured from the centerline to the outer edge or as the ring thickness in a cut view. It determines sealing force, squeeze, and groove fit.
Simple relationship
OD=ID+2×CSOD = ID + 2 \times CSOD=ID+2×CS
Measurement guidance
When measuring with calipers:
- Measure ID for the inner opening.
- Measure OD for the outside width.
- Measure CS for the thickness of the ring cross section.
These three dimensions are the standard way to specify an O-ring and ensure the correct fit in a groove or sealing gland.
Why Use Red Silicone
- Easy visual identification during assembly and inspection.
- Useful for material coding in production lines.
- Supports OEM branding and product differentiation.
- Silicone can be colored without losing flexibility or heat resistance.
- Red is widely recognized as a silicone seal color in many industries.
Color Meaning
Red silicone O-rings are often used to indicate silicone material or high-temperature sealing service, but color conventions can vary by supplier and industry. Because of that, the material specification should always be defined clearly instead of relying on color alone.
The safest practice is to confirm:
- Material type.
- Hardness.
- Temperature range.
- Chemical resistance.
- Required compliance standard.
Material Performance
Silicone is known for strong flexibility and excellent performance in both low and high temperatures. That makes it a good fit for static sealing in equipment that cycles through hot and cold conditions.
Red silicone O-rings are also available in FDA-compliant and food-grade formulations, making them suitable for sanitary equipment. They are not usually the best choice for heavy oil exposure or strong solvents, where NBR or FKM may perform better.
Common Applications
- Food and beverage machinery.
- Dairy and sanitary processing.
- Medical and laboratory equipment.
- Industrial pumps and valves.
- Household appliances and electronics.
- OEM assemblies that need colored seal identification.
Customization Options
Red silicone O-rings can be customized by:
- Inner diameter and cross section.
- Hardness.
- FDA or other compliance requirements.
- Standard or non-standard dimensions.
- Molded or cut-ring production.
- Private-label packaging.
- Custom red shade or other color matching.
This makes them suitable for both replacement parts and OEM supply programs.
Why Source from Julong Rubber?
- Custom color silicone production.
- Food-grade and high-temperature silicone compounds.
- Stable hardness and color consistency.
- Standard and non-standard size support.
- OEM and private-label packaging available.
- Suitable for food, medical, industrial, and general sealing use.
FAQ
Can red silicone O-ring dimensions be customized?
Yes. Red silicone O-rings can be customized by inner diameter, outer diameter, cross-section and dimensional tolerance. Buyers should provide a drawing, size list, standard reference or physical sample. Unsupported dimensions should not be assumed because groove fit and compression directly affect sealing performance.
Why are silicone O-rings commonly produced in red?
Red is often used for visual identification in sealing programs. It can help warehouse staff, assemblers and maintenance teams distinguish silicone O-rings from black NBR, EPDM or other rubber seals. Color coding is useful, but material verification is still required for critical applications.
How should buyers select the silicone compound?
Silicone compound selection depends on operating temperature, contact media, compression requirement, movement type and documentation needs. Buyers should provide the actual liquid or gas in contact with the O-ring, exposure time, pressure condition and application environment before material approval.
Are samples available before bulk production?
Samples are available upon request. Sample preparation depends on the O-ring size, silicone compound, color requirement, Shore A hardness, tolerance, tooling status and packaging method. A drawing, standard size reference or physical sample helps confirm the specification before batch production.
What is the MOQ for red silicone O-rings?
MOQ depends on size, compound, hardness, tooling condition, packaging method and order quantity per specification. Existing-tooling sizes and fully custom molded sizes may have different MOQ requirements. Please provide the size list and annual demand for review.
Are compliance documents available?
Compliance documentation can be reviewed upon request for applicable silicone compounds. Buyers should specify the required standard, end-use market, contact media and documentation format before quotation, sampling or batch production.
Request a Custom Quote
Send your red silicone O-ring drawing, size list, 3D model or physical sample for technical review. Please include dimensions, tolerance, silicone compound, Shore A hardness, contact media, temperature, pressure, quantity, annual demand, compliance requirements and packaging method.
