How O Rings Work: A Complete Guide to Sealing Solutions in the UK

When it comes to reliable sealing solutions, o rings remain one of the most widely used components across industries in the UK. From automotive engines to kitchen appliances, these simple yet powerful seals play a crucial role in preventing leaks and maintaining pressure.

In this complete guide, we’ll explain how they work, what materials they’re made from, and how to choose the right type for your application.

What Are O Rings?

O rings are circular elastomer loops designed to fit into a groove and compress between two or more parts, creating a seal at the interface. They are incredibly versatile and used in both static and dynamic applications to prevent the passage of liquids or gases.

How They Work

At their core, o rings function through compression. When installed in a groove and compressed between two surfaces, they deform slightly to block the passage of fluids or air. Their elasticity helps them return to shape after pressure changes, making them reusable in many cases.

O Ring Sealing Mechanism:

  • Static Seals: Used in non-moving components such as water pipes.
  • Dynamic Seals: Used where movement occurs, such as in hydraulic cylinders.
  • Face Seals: Sealing occurs against a flat surface.
  • Radial Seals: Sealing happens against the inside or outside of a cylindrical surface.

Common Materials

The choice of material determines performance, resistance, and suitability for different environments. Here are some commonly used materials:

  • Nitrile O Rings (NBR): Ideal for oil and fuel resistance.
  • Silicone O Rings: Great for temperature extremes, flexibility, and food-safe environments.
  • EPDM: Suitable for steam, water, and UV exposure.
  • Viton®: Excellent chemical and heat resistance.

Popular Types of O Rings in the UK

  1. Rubber – General-purpose, cost-effective seals.
  2. Silicone – Preferred in the food, medical, and high-temperature industries.
  3. Custom – Tailored to exact dimensions or materials for specialist applications.
  4. High Temperature – Designed for extreme heat or industrial-grade environments.

To explore a wide range of sizes and specifications, check out our o rings collection here.

Key Applications

O rings are used in virtually every industry across the UK. Common applications include:

  • Automotive engines and gearboxes
  • Plumbing systems
  • Medical devices
  • Food processing equipment
  • Hydraulic and pneumatic machinery
  • Aerospace and marine industries

Their affordability, ease of replacement, and reliability make them an essential sealing solution for both everyday and specialised tasks.

Choosing the Right O Ring: What to Consider

Selecting the right o ring depends on several factors:

  • Temperature range – Choose materials like silicone for high-temperature use.
  • Chemical exposure – Consider Viton® or nitrile for chemical resistance.
  • Pressure and movement – Static vs dynamic sealing requires different tolerances.
  • Size – Always refer to standard o ring sizes UK or opt for custom specifications.
  • Certifications – For food-grade or medical uses, select compliant materials.

Partnering with a trusted o ring supplier UK can help you make the right choice.

Why Buy O Rings from a UK Supplier?

Buying from a UK-based supplier ensures faster delivery, local expertise, and compliance with British manufacturing standards. At Silicone Rubber Products, we provide a broad range of o rings and sealing solutions tailored to meet both industry-specific and general-purpose needs.

Get Expert Advice on Your O Ring Needs

Need help finding the perfect seal? Contact our team for guidance on custom sizes, materials, and bulk orders.

Phone: 01903 732088
Email: sales@silcoproducts.co.uk

Whether you’re looking for rubber o rings, silicone o rings, or bespoke sealing options, visit our O Rings product page to explore our full range and request a quote today.

Frequently Asked Questions

Q1: What is the best material for them?
A1: It depends on your application. For oil resistance, nitrile is ideal; for high temperatures or food safety, silicone is preferred.

Q2: Can I get custom rings made in the UK?
A2: Yes, many suppliers including Silicone Rubber Products offer custom o rings in various materials and dimensions.

Q3: How do I measure one?
A3: Measure the internal diameter (ID), outer diameter (OD), and cross-sectional thickness. Refer to standard UK size charts for accuracy.