Sealing O-ring: Pressure Rating Up to 10 MPa static

Component Specifications

Definition

An O-ring is a mechanical gasket in the shape of a torus (doughnut-shaped ring) designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface. In lens mounts and housings, it specifically prevents the ingress of dust, moisture, or other contaminants while maintaining internal pressure or vacuum conditions critical for optical performance.

Working Principle

The O-ring creates a seal through elastic deformation when compressed within a gland (groove). The resulting contact pressure between the O-ring and mating surfaces blocks the passage of fluids or gases. Its circular cross-section allows it to seal in both axial and radial directions, accommodating minor movements and thermal expansion.

Materials

Typically made from elastomers such as Nitrile Rubber (NBR), Fluorocarbon (FKM/Viton), Silicone (VMQ), or Ethylene Propylene Diene Monomer (EPDM), selected based on temperature range, chemical resistance, and compression set requirements.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	70-90 Shore A
Inner Diameter	Varies by application (e.g., 5-50 mm)
Pressure Rating	Up to 10 MPa static
Temperature Range	-40°C to +200°C (material-dependent)
Cross Section Diameter	Commonly 1-5 mm

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 3601, AS 568, JIS B 2401

Parent Products

This component is used in the following industrial products

Lens Mount / Housing

A structural component that securely holds and positions the optical elements within a collimating lens assembly.

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Engineering Analysis

Risks & Mitigation

Chemical degradation from cleaning solvents
Extrusion under high pressure
Thermal expansion mismatch
Installation damage (nicking, twisting)

FMEA Triads

Trigger: Incorrect gland design (e.g., insufficient compression)
Failure: Leakage due to inadequate sealing pressure
Mitigation: Follow ISO 3601 gland design standards; verify compression ratio (typically 15-30%)

Trigger: Material incompatibility with optical lubricants
Failure: Swelling or cracking of O-ring
Mitigation: Test material compatibility with specific fluids; use FKM or FFKM for aggressive chemicals

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.10 mm on inner diameter per ISO 3601-1

Test Method

Leak testing via pressure decay or helium mass spectrometry; compression set testing per ASTM D395

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Sealing O-ring

Manufacturer profiles associated with Sealing O-ring.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the most common cause of O-ring failure in lens mounts?

Compression set, where the O-ring loses elasticity over time due to continuous compression, leading to seal leakage.

How do I select the right O-ring material for a lens housing?

Consider operating temperature, exposure to UV light, chemical compatibility with lubricants or cleaning agents, and required compression set resistance. FKM is often used for high-temperature stability.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Sealing O-ring