FDA Food Grade Silicone O-Rings
Manufacturer & Custom Solutions
FDA Food Grade Silicone O-Rings
ZSR Silicone FDA food grade O-rings are made with ingredients listed in FDA 21 CFR 177.2600. They are odorless, tasteless and safe for repeated food contact. Common uses include dairy equipment, beverage dispensers and baking ovens.
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-Rings Options
Every Silicone Grade, One Perfect Seal
Every O-ring starts with the right compound. Platinum-cured and peroxide-cured systems are available for all grades — we recommend platinum cure for food and medical contact.
| Grade | Hardness (Shore A) | Temperature | Compliance | Best For |
|---|---|---|---|---|
| Industrial VMQ | 30 – 80 | -60°C to +230°C | RoHS / REACH | General industrial sealing |
| FDA Food Grade | 30 – 70 | -60°C to +230°C | FDA 21 CFR 177.2600 | Food & beverage equipment |
| Medical Grade (Platinum) | 10 – 70 | -60°C to +230°C | USP Class VI | Medical devices & laboratory |
| High Temperature | 40 – 80 | up to +300°C | RoHS | Ovens, lighting, engine bays |
| Fluorosilicone (FVMQ) | 40 – 80 | -60°C to +200°C | RoHS | Fuel, oil & solvent exposure |
| LSR (Liquid Silicone) | 10 – 80 | -60°C to +230°C | FDA / medical grades | High-volume precision parts |
| Transparent / Clear | 30 – 70 | -60°C to +200°C | FDA options | Visual inspection points |
From 0.5 mm ID to Oversized Joint Rings
Size, cross-section and tolerance are fully custom. Send a drawing, a standard size number (e.g., AS568-214), or a physical sample — we handle the rest.
| Item | Range / Options |
|---|---|
| Size Range | ID 0.5 – 500 mm+; molded or vulcanized-joint for oversized IDs |
| Cross-Section | 0.5 – 10 mm; round (standard), square-cut, custom profile |
| Size Standards | AS568 · JIS B2401 · BS 1806 · DIN 3771 · ISO 3601 · ISO 6149 · AN6227 / AN6230 (see standards table below) |
| Tolerance | ISO 3302-1 class per size & process; ±0.05 mm on small molded rings |
| Custom Geometry | Non-standard ID / cross-section from your drawing or sample |
| Surface | Standard finish / PTFE-coated for low friction |
Any Color Your Brand or Assembly Needs
We color-match silicone compounds to Pantone or RAL references, including translucent and transparent grades for visual inspection points.
Your Brand, Built Into the Part
Branding, part numbers and batch traceability — molded in, engraved or printed, without compromising the seal.
Molded, Spliced or Coated — One Factory
Molding, splicing and finishing under one roof — we match the process to your volume, size and tolerance target.
| Process | How It Works | Best For |
|---|---|---|
| Compression Molding | Pre-formed silicone pressed and cured in a heated mold | Medium volumes, large cross-sections |
| LSR Injection Molding | Liquid silicone injected into closed molds | High volumes, tight tolerances |
| Vulcanized Joint (Spliced) | Extruded cord cut to length and vulcanized into a ring | Oversized IDs, low volumes, fast tooling |
| PTFE Coating | Low-friction coating applied to finished rings | Dynamic sealing, easy installation |
| Rapid Prototyping | Prototype tooling before production mold | Fit & function validation |
Related Silicone O-ring
| Image | Product | Type | Short Info | Action |
|---|---|---|---|---|
| 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 |
| JIS B2401 Silicone O-Ring | Standard & Size | Japanese industrial standard O-rings commonly used in Asian-manufactured machinery and automotive equipment. | View Details |
| 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 |
|
| 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 |
| 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 |
| 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 |
 | VMQ Silicone O-Rings | Materials | Heat and cold-resistant silicone O-rings for food, medical, automotive, and industrial applications. | 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 |
| Fiberglass Reinforced Silicone O-rings | Materials | High-strength silicone O-rings reinforced with fiberglass fabric. Withstands extreme heat and pressure. | 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 |
| Custom Colors Silicone O-rings | Color | Silicone O-rings matched to your exact color sample or specification. | View Details |
What Is FDA Food Grade Silicone?
FDA Food Grade silicone is silicone rubber that has been formulated, tested, and produced to meet U.S. food-contact safety rules. It is the same basic material as industrial silicone — flexible, heat-resistant, and durable — but it is held to a higher standard of purity and cleanliness.
How It Is Different from Industrial Silicone
The difference is not in the main polymer. Both grades use polydimethylsiloxane. The difference is in what else is in the mix and how it is processed:
Key Properties of FDA Food Grade Silicone
FDA Food Grade Silicone is simply industrial silicone that has been cleaned up, tested, and documented for food safety. It costs more than industrial grade because of the extra controls, but for any product that touches food or drink, it is the only responsible choice. At ZSR, we produce food-grade O-rings in standard sizes and custom sizes, with full paperwork to support your quality audits and customer claims.
FDA Food Grade Silicone O-Ring Specifications
Standard sizes from tooling in stock, custom sizes from your drawing — both in certified food-grade compounds.
| Item | Range / Options | Test Standard |
|---|---|---|
| Standards | AS568 series (dash -001 to -475), ISO 3601, JIS B 2401, metric, custom drawing | AS568 / ISO 3601 |
| Size Range | Inner diameter 0.7 – 600 mm; cross-section (CS) 0.5 – 10 mm | ISO 3601-1 |
| Tolerance | Class B / A per application; ±0.05 mm on critical dimensions | ISO 3601-1 |
| Material | VMQ, platinum-cured HCR / HTV, LSR (FVMQ on request) | — |
| Hardness | 30 – 80 Shore A (customizable) | ASTM D2240 |
| Working Temp | -60°C to +230°C (special grades to +300°C) | — |
| Compliance | FDA 21 CFR 177.2600 (COA per batch), LFGB on request | Extraction test |
| Process | Compression molded, LSR injection | — |
| MOQ | Standard sizes: 100 pcs | Custom molded: 500 pcs | — |
| Lead Time | Standard sizes: 3–7 days | Custom tooling: prototype in 2–5 days, production 7–15 days | — |
Standard AS568 or Custom: Two Ways to Order
Both routes use the same certified compounds — the difference is whether the tooling already exists.
Standard AS568 Food Grade O-Rings
Dash sizes -001 to -475 from existing tooling — the fastest and cheapest way to get certified food-grade O-rings.
- No tooling cost; 3–7 day delivery from stock compounds
- Batch COA with every shipment
- MOQ 100 pcs; volume pricing at 1,000+
Custom Molded Food Grade O-Rings
Non-standard diameters, special cross-sections, or bonded shapes — tooled in-house from your drawing.
- In-house mold design & making, steel-safe for iterations
- Rapid prototyping: samples in 2–5 days
- MOQ 500 pcs; DFM feedback included
FDA Compliance Explained
At ZSR Silicone Parts, FDA Food Grade means our silicone O-rings meet FDA 21 CFR 177.2600 — the U.S. regulation for rubber articles that touch food again and again. Here is what that means in plain language.
What 21 CFR 177.2600 Requires
This rule sets two main requirements for food-contact silicone:
Allowed Ingredients Only
The silicone compound must use only raw materials that the FDA has approved for repeated food contact. This includes the base polymer, fillers, pigments, and curing agents.
Extractables Limits
When tested, the O-ring must not release too much material into food simulants. The standard tests use distilled water and n-hexane under controlled temperature and time. The extractable matter must stay below the FDA limits.
How ZSR Meets These Requirements
Formula Control
Every food-grade compound at ZSR is built from an FDA-approved recipe. We do not swap fillers or pigments without checking the FDA list first.
Post-Curing
All food-grade O-rings receive a secondary oven bake at 180°C–200°C for several hours. This removes residual volatiles and stabilizes the material before it reaches you.
Platinum Curing Preferred
We use platinum-cured silicone for most food-grade orders because it leaves no peroxide by-products. This gives lower extractables and a cleaner, odor-free part.
Testing on File
ZSR keeps third-party test reports for extractables and migration. We can share these with your quality team on request.
Important Note:
FDA 21 CFR 177.2600 is a U.S. standard. If you also sell in Europe, you may need LFGB or EU 10/2011 compliance. ZSR can produce dual-certified compounds that pass both FDA and LFGB testing. Just tell us your target market when you order.
Food Grade vs Industrial Grade
The material looks the same, but the production rules are different. Here is how ZSR's Food Grade O-rings differ from our Industrial Grade O-rings.
Feature | Industrial Grade | FDA Food Grade |
|---|---|---|
Purpose | General machinery and equipment sealing | Safe for direct or repeated contact with food and drinks |
Curing System | Peroxide or platinum cured | Usually platinum cured for lowest extractables |
Odor & Taste | May have slight rubber smell | No odor, no taste |
Post-Cure Process | Standard | Extended post-cure to remove volatiles |
Production Area | Standard clean workshop | Dedicated food-grade line or strict cleaning between batches |
Migration Testing | Not required | Tested for extractables in water and n-hexane |
Documentation | Standard COA | FDA compliance declaration + migration test report |
Traceability | Batch number recorded | Batch + raw material lot tracked |
Color Options | Any color | Food-safe pigments only |
Price | Lower | Higher due to extra testing and process control |
When to Choose Food Grade at ZSR:
When Industrial Grade Is Enough:
Application Examples
ZSR manufactures FDA food-grade silicone O-rings for equipment and appliances where safety and cleanliness matter.
Industry | Application | Why Food Grade Matters |
|---|---|---|
Coffee & Beverage | Espresso machine seals, coffee maker gaskets, water dispenser O-rings, juice extractor seals | No taste or smell transfers into drinks. Handles hot water and steam daily. |
Food Processing | Mixing tank seals, conveyor belt gaskets, filling machine O-rings, dairy equipment | Resists cleaning chemicals and high-temperature washdowns. Safe for repeated food contact. |
Home Appliances | Blender gaskets, food processor seals, rice cooker lids, steam oven doors | Direct contact with food and steam. Parents and cooks expect safe materials. |
Baby & Childcare | Baby bottle seals, sippy cup gaskets, breast pump parts, baby food containers | Highest safety expectation. No harmful chemicals. Platinum-cured purity preferred. |
Commercial Kitchen | Steam table gaskets, dishwasher seals, ice machine O-rings | Must pass health inspections. Needs reliable documentation from the supplier. |
Pharmaceutical | Tablet press seals, mixing vessel gaskets, liquid transfer equipment | Although not medical grade, food-grade purity is often accepted for non-implant drug equipment. |
Where FDA Food Grade O-Rings Seal
Repeated food contact, daily CIP cleaning, and temperature cycles — compound and cure system matched to each job.
Beverage & Dispensing
Carbonated drink dispensers, beer taps, coffee machines and bottling valves. COâ‚‚-resistant compounds, taste-neutral against flavored beverages.
Dairy & Food Processing
Pump shafts, valve seats, homogenizer and filler seals on CIP/SIP lines. Autoclave-compatible platinum-cured grades available.
Pharma & Bioprocessing
Where USP Class VI documentation is required, step up to medical grade gaskets and seals on the same tooling base.
How to Verify an FDA O-Ring Supplier
O-rings are the highest-volume food-contact seal — and the most frequently mislabeled. Five checks before you buy.
| Check | Why It Matters for O-Rings |
|---|---|
| Compound-level FDA compliance | Many "food grade" O-rings use FDA-listed base rubber with non-listed fillers or pigments. Ask for the compound's permitted-ingredient declaration, not just a polymer datasheet. |
| Extraction test data | 21 CFR 177.2600 limits (≤ 20 mg/in² aqueous, ≤ 175 mg/in² n-hexane) must be met by the cured compound. We provide results per batch. |
| COA on every shipment | O-rings ship in huge lots; a COA per batch is the only way to audit what went into your line. |
| Curing system | Platinum-cured O-rings have lower extractables and no peroxide odor — important for taste-sensitive beverages. Ask which cure system the compound uses. |
| Dimensional certification | AS568 sizes should ship with dimensional inspection data, especially for groove-critical applications. |
ZSR provides all five: batch extraction results, COA per shipment, platinum-cured compounds as standard, and dimensional reports on request. See ZSR certifications.
FDA Food Grade O-Ring FAQs
Quick answers for buyers qualifying food-contact O-rings.