Black / White Silicone O-Rings
Manufacturer & Custom Solutions
Black / White Silicone O-Rings
Black and white are the most requested colors for silicone O-rings. ZSR Silicone keeps both in stock across standard sizes and hardness levels. Black hides dirt in industrial settings; white signals food-grade or medical-grade cleanliness.
FDA 21 CFR 177.2600
Rubber Articles Intended for Repeated Use
LFGB 30&31
EU Food Contact Materials
USP Class VI / ISO 10993
Biocompatibility of Medical Devices
RoHS / REACH
Environmental Compliance
UL 94
Flammability of Plastic Materials
Built to Your Exact Spec
Custom Silicone O-ring Options
| Image | Product | Type | Short Info | Action |
|---|---|---|---|---|
 | ISO 3601 Metric Silicone O-Rings | Standard & Size | Metric silicone O-rings manufactured to ISO 3601 dimensions. Fits international equipment groove standards. | View Details |
 | ISO 6149 Metric Silicone O-Rings | Standard & Size | Metric O-rings designed for hydraulic and pneumatic fluid power sealing applications under ISO 6149 standards. | View Details |
 | BS 1806 Silicone O-rings | Standard & Size | British Standard inch-size silicone O-rings. Common in UK and Commonwealth industrial equipment. | View Details |
 | DIN 3771 Silicone O-rings | Standard & Size | German metric standard O-rings for hydraulic and pneumatic sealing in European machinery. | View Details |
 | Custom Molded Silicone O-rings | Standard & Size | Custom-shaped silicone O-rings molded to your exact drawing or sample. No standard size limitations. | View Details |
 | AS568 Silicone O-rings | Standard & Size | Inch-size silicone O-rings that follow the AS568 standard. Widely used in North American machinery and hydraulic systems. | View Details |
 | AN6227 Silicone O-rings | Standard & Size | Aerospace-standard O-rings with small cross-section. Used in aviation and military-grade sealing. | View Details |
 | AN6230 Silicone O-rings | Standard & Size | Aerospace-standard O-rings specified under AN6230 for aviation and military-grade sealing. | View Details |
 | JIS B2401 Silicone O-Ring | Standard & Size | Japanese industrial standard O-rings commonly used in Asian-manufactured machinery and automotive equipment. | View Details |
 | FDA Food Grade Silicone O-Rings | Grade | Food-safe silicone O-rings compliant with FDA regulations. Safe for repeated food contact. | View Details |
 | Industrial Grade Silicone O-ring | Grade | General-purpose silicone O-rings for industrial sealing. Cost-effective with reliable performance. | View Details |
 | Medical Grade Silicone O-ring | Grade | Biocompatible silicone O-rings for medical devices. Passes USP Class VI and supports sterilization. | View Details |
 | Oil-Resistant / Fuel-Resistant Silicone O-Rings | Special Function | Modified silicone O-rings that resist swelling in oils, fuels and petroleum-based fluids. | View Details |
 | Metal Detectable Silicone O-Rings | Special Function | Food-safe silicone O-rings with metal-detectable additives. Protects production lines from contamination. | View Details |
 | High Temperature / Heat Resistant Silicone O-Rings | Special Function | Silicone O-rings that stay flexible at temperatures above 200°C. For ovens, engines and furnaces. | View Details |
 | VMQ Silicone O-Rings | Materials | Heat and cold-resistant silicone O-rings for food, medical, automotive, and industrial applications. | View Details |
 | Fiberglass Reinforced Silicone O-rings | Materials | High-strength silicone O-rings reinforced with fiberglass fabric. Withstands extreme heat and pressure. | View Details |
 | HCR / HTV / Solid Silicone Rubber O-rings | Materials | Durable solid silicone rubber O-rings made by compression molding. The standard choice for general sealing. | View Details |
 | Liquid Silicone Rubber (LSR) O-rings | Materials | Injection-molded liquid silicone rubber O-rings with tight tolerances and clean surfaces. Ideal for high-volume production. | View Details |
 | Platinum Cured Silicone O-rings | Materials | Ultra-clean silicone O-rings cured with platinum catalyst. Lower extractables for food and medical use. | View Details |
 | Fluorosilicone (FVMQ) O-rings | Materials | Fuel and oil-resistant silicone O-rings for aerospace, automotive and chemical applications. | View Details |
 | Transparent / Clear Silicone O-rings | Color | See-through silicone O-rings for visual inspection and clean-looking medical or food equipment. | View Details |
 | Black / White Silicone O-Rings | Color | Standard black and white silicone O-rings. The most common colors for industrial and food-grade applications. | View Details |
 | Pantone Colors Silicone O-rings | Color | Silicone O-rings in any Pantone color for branding, color-coding or aesthetic requirements. | View Details |
 | Custom Colors Silicone O-rings | Color | Silicone O-rings matched to your exact color sample or specification. | View Details |
Black vs White: More Than Just Color
At ZSR Silicone Parts, black and white are our most popular color choices. But the color is not just about looks. The pigments used to make black and white silicone also change some material properties.
Feature | Black Silicone | White Silicone |
|---|---|---|
Main Pigment | Carbon black | Titanium dioxide (TiOâ‚‚) |
UV Resistance | Excellent — carbon black absorbs UV light and protects the rubber | Good — TiO₂ reflects UV but does not absorb it as strongly |
Heat Resistance | Slightly better — carbon black acts as a mild heat stabilizer | Standard — same as base silicone |
Electrical Property | Slightly conductive — carbon black can lower resistivity slightly | Insulator — standard electrical properties |
Appearance | Hides dirt and stains well | Looks clean and bright — shows contamination easily |
Typical Uses | Outdoor equipment, automotive, industrial machinery, electronics | Medical devices, food equipment, cleanroom applications, consumer products |
Cost | Standard | Standard — TiO₂ is slightly more expensive but the difference is small |
Color Matching | Easy to match batch to batch | Easy to match batch to batch |
Why Black Is Better for Outdoor and Hot Applications
The carbon black pigment in black silicone does more than add color. It acts like a tiny UV shield. It absorbs ultraviolet light from the sun and converts it to heat, which prevents the UV from breaking down the silicone polymer chains. This means black O-rings usually last longer in direct sunlight and outdoor weather than white O-rings.
At ZSR, we recommend black for:
Why White Is Preferred for Clean and Sensitive Applications
White silicone uses titanium dioxide pigment. This pigment is inert, non-toxic, and widely accepted in food and medical applications. White O-rings look clean and make it easy to spot dirt, dust, or contamination during inspection.
At ZSR, we recommend white for:
Important Note on Conductivity
The carbon black in black silicone can make the material slightly more conductive than white silicone. In most sealing applications, this difference is too small to matter. But if your application requires exact electrical insulation, ask ZSR for a specific test report on the resistivity of our black compound.
Color Consistency Control
When you order 10,000 black O-rings from ZSR, every piece should look the same. Color consistency is critical for brand appearance, quality control, and customer trust. Here is how ZSR ensures batch-to-batch color matching.
Pre-Dispersed Color Masterbatches
At ZSR, we do not dump raw pigment powder into the silicone. We use pre-dispersed color masterbatches. These are concentrated color pastes where the pigment is already evenly mixed into a silicone carrier. When we add the masterbatch to the main compound, the color disperses uniformly. This prevents pigment clumps and spots that can cause uneven coloring.
Color Measurement with Instruments
ZSR uses a colorimeter (also called a spectrophotometer) to measure color numerically. Instead of judging color by eye, we measure:
For each standard color, we keep a master color standard on file. Every new batch is measured against this standard. We accept the batch only if the color difference (Delta E) is below our internal limit — typically Delta E < 1.5 for standard orders and Delta E < 1.0 for premium orders.
Batch-to-Batch Control
For large orders that ship in multiple batches, ZSR:
Visual Inspection
Even with instruments, ZSR operators perform visual checks under standard daylight lamps. This catches any surface defects, color streaks, or contamination that instruments might miss.
What Customers Should Know
Natural color variation
Silicone is a natural material. Slight color variation between batches is normal and does not affect performance.
Color matching
If you need an exact color match to a Pantone code or a physical sample, send us the reference. We can create a custom masterbatch and match it within Delta E < 1.0.
Large orders
For orders over 50,000 pieces, we recommend producing all pieces from the same masterbatch lot to ensure maximum consistency.
What Is Black / White Silicone?
Black and white silicone are the most common colors of silicone rubber used for O-rings. They are not different materials — they are the same silicone rubber with different pigments added during mixing.
How Black Silicone Is Made
At ZSR, we make black silicone by adding carbon black pigment to the raw silicone compound. Carbon black is a very fine powder made from burned hydrocarbons. It is one of the oldest and most stable pigments in the rubber industry. It disperses easily into silicone and gives a deep, solid black color that does not fade over time.
How White Silicone Is Made
We make white silicone by adding titanium dioxide (TiOâ‚‚) to the raw compound. Titanium dioxide is a white mineral powder used in paints, plastics, and cosmetics. It is safe for food and medical contact and gives a bright, clean white color.
Are They Different from Colored Silicone?
Not really. The base silicone polymer is the same. The only difference is the pigment. However, the pigment choice can have small effects:
Performance
Both black and white silicone O-rings at ZSR perform the same in terms of: