Silicone Seals
Custom and standard silicone rubber seals manufactured in Worthing, West Sussex. Compression seals, lip seals, tadpole seals, edge trims and door seals — extruded in solid or sponge silicone to your exact profile, with all tooling produced in-house.
Every Type of Silicone Rubber Seal, Made to Order
From simple compression seals to complex custom profiles — if it seals a gap, we extrude it. Click any seal type for profiles and specifications.
UK Silicone Rubber Seal Manufacturers
Viking Extrusions has manufactured silicone seals in Worthing since 1991. From single prototype lengths to continuous production runs, we extrude silicone rubber seals for appliance manufacturers, machine builders, food processors and engineers across the UK and beyond.
Every seal starts with the right profile. We hold a library of over 10,000 existing dies covering the common seal sections — and when your application needs something unique, our engineering team designs and manufactures custom seal tooling in-house, typically in as little as 5 working days. Send us a drawing, a CAD file or even a worn sample of the seal you need to replace.
Because silicone maintains its elasticity from freezer-cold to oven-hot, resists UV and ozone degradation outdoors, and is available in FDA food-safe grades, it outlasts organic rubber seals in almost every demanding environment — often by years.
The Right Silicone Grade for Every Seal
We formulate and extrude sealing profiles in specialist grades engineered for the conditions your seal will live in.
- FDA 21 CFR 177.2600
- EC 1935/2004 compliant
- Odourless and tasteless
- Steam & autoclave resistant
- Continuous service to +300°C
- Low compression set at heat
- Retains flexibility at extremes
- Ideal for oven door seals
- Density 150–500 kg/m³
- Excellent compression recovery
- Thermal & acoustic insulation
- Flame-retardant options
Specialist compounds are also available for sealing applications: flame-retardant (EN 45545-2 rail and aerospace spec), metal-detectable for food processing, electrically conductive, and platinum-cured for medical and pharmaceutical use. Read our guides to silicone rubber grades and platinum vs peroxide cured silicone.
Why Silicone Outlasts Other Rubber Seals
A seal only works while it stays elastic. Here's how silicone compares with the organic rubbers it replaces.
| Sealing Property | Silicone (VMQ) | EPDM | Neoprene |
|---|---|---|---|
| Temperature Range | -50 to +300°C | -40 to +130°C | -30 to +120°C |
| Compression Set (stays springy) | ✓ Excellent | ✓ Good | ○ Fair |
| UV / Ozone / Outdoor Life | ✓ Excellent | ✓ Good | ○ Fair |
| Food Safe (FDA) Grades | ✓ Yes | ○ Limited | ✗ No |
| Flexibility When Cold | ✓ To -50°C | ○ Stiffens | ✗ Hardens |
| Oil / Fuel Resistance | ○ Fair | ✗ Poor | ✓ Good |
| Colour Options | ✓ Any colour | Black standard | Black standard |
The short version: if your seal faces heat, cold, sunlight, weather or food-contact requirements, silicone will hold its seal long after organic rubbers have hardened, cracked or taken a permanent set. For seals that live in oil or fuel, ask us about alternative elastomers — we extrude those too, and our advice is based on what's right for your application.
How to Specify the Right Seal
Six decisions that determine whether a seal works for years or fails in months.
Match Seal Type to the Gap
A constant, parallel gap suits a compression seal. A panel edge needs a channel seal. A sliding surface needs a lip seal. A variable or uneven gap may need our inflatable seals instead.
Solid or Sponge?
If the closure applies real force (a latched steel door), solid silicone seals best. If closure force is light (an access panel, electronics enclosure), closed-cell sponge gives an IP-rated seal without distorting the door.
Get the Compression Right
Seals work best compressed 15–30% of their free height. Under-compressed seals leak; over-compressed seals take a permanent set and fail early. Tell us your gap and we'll size the profile.
Choose the Hardness
Softer grades (Shore A 20–40) conform to imperfect surfaces with less force; harder grades (60–80) resist abrasion and hold shape. Our shore hardness guide explains the trade-offs.
Fixings & Fitting
Seals can be designed to push into a channel, clip over a flange, self-grip a panel edge, or bond with adhesive. Designing the retention into the profile beats glue every time — tell us how it mounts.
Length, Coil or Ring?
We supply seals cut to precise lengths, coiled on drums for your production line, or vulcanised into endless joined rings matched to your door or aperture dimensions.
Silicone Seals for Every Sector
Our seals keep out water, dust, heat and contamination across UK industry.
Silicone Seal Manufacturing Capabilities
| Property | Specification | Notes |
|---|---|---|
| Temperature Range | -50°C to +200°C (standard), +300°C (HT grade) | Continuous service rating |
| Hardness (Solid) | Shore A 20 to 80 | Standard: 40, 50, 60, 70 |
| Density (Sponge) | 150 to 500 kg/m³ | Closed-cell structure |
| Profile Size | Up to 200mm wide, walls from 0.5mm | Wider on request |
| Tolerances | BS 3734-1 / ISO 3302-1 Class E3 (standard) | Class E2 close tolerance on request |
| Colours | Translucent, white, black, red, blue, grey + custom | RAL / Pantone colour matching |
| Supply Format | Cut lengths, coils, vulcanised joined rings | Precision cutting in-house |
| Minimum Order | 10 metres | No maximum — continuous production |
| Compliance Options | FDA 177.2600, EC 1935/2004, EN 45545-2 | Grade dependent |