We are able to ship to the UK, Europe and worldwide.

Custom Square Rubber Seals

Manufactured to order from sponge and solid materials in a selection of sizes, colours and hardnesses.

Looking for an off-the-shelf product? View our range of square rubber seals available for next working day delivery. 

We can manufacture custom square rubber seals suitable for a diverse range of sealing and bump protection applications. The simplistic shape of this profile allows this section to be used within most industry sectors. Square profiles can be extruded with a hollow centre when being used as a watertight seal to stop water ingress. However, we can also extrude or cut a range of rubber materials into solid square or rectangular sections.

Extruding square rubber seals with a hollow centre allows for the seal to easily compress and create a watertight seal to reduce the chance of water ingress. These profiles are often captivated in a channel where a knife edge or ball nose goes into the centre of the seal. This edge compresses the profile into itself to create a watertight seal. Square profiles like this are often used as hatch and locker seals on super yachts and other large marine vessels.

We can also cut square and rectangular sections from solid and semi-sold materials, such as Neoprene, Silicone and Natural rubber. These products are often used to fill channels or create a sealing solution on doors, hatches and portlights.

Our custom seals are made-to-order based on your projects requirements. Please contact us with your specifications.

Material and Dimensions  

Square shaped rubber seals are available from an extensive range of off-the-shelf products but can also be manufactured to order. To enable us to look into whether your requirements can be met by a standard or custom profile, we require an existing sample or dimensions of the required seal.

A: Height
B: Width
C: Wall Thickness
D: Material
E: Hardness or Density
F: Number of Metres

Drawing of a Square Rubber Seal With Dimensions

Our Custom Rubber Seal Manufacturing Process 

We work with a large range of rubber and plastic compounds including EPDM, Natural rubber, Neoprene, Nitrile, Silicone and PVC, many of which are available in either sponge or solid forms. This selection allows us to extrude a profile taking into account any environmental, chemical or temperature demands.

The manufacturing process starts with our specialist toolmakers who turn your sample or technical dimensioned drawing into a tool which can be used to extrude an exact replica of your rubber seal. This extrusion process uses temperature and pressure to push your chosen rubber compound through the tool to extrude the required shape. The extruded seal is then cured using heat to vulcanise and harden the extrusion.

Although the majority of rubber seals are manufactured using a very similar procedure, we understand that your sealing solution may require additional non-standard processes. This could include joining, applying self-adhesive backing or cutting to desired lengths. Whilst it is possible to do this on-site after production, it is often preferable to do this at the time of manufacture to increase the speed and ease of installation of the final product.

Manufacturing a custom rubber seal can be completed at a relatively low cost with production runs requiring as little as 30 metres. For large production quantities, we have the option of manufacturing sample lengths before going to bulk production. This allows you to look at the finished product and test how it performs. The process of moving from concept to delivery can normally be fulfilled within two to three weeks, depending on the material and complexity of the profile.

Sample or Concept

Technical Drawing



Drawing of a Square Rubber Seal

Seal Design Service

Our CAD facilities allow us to work with you in designing the best sealing solution for your project. If your sealing requirements cannot be met by a standard section and you do not have a sample or technical dimensioned drawing, our Design Engineers can design a custom solution to your requirements.

Data Sheets

Standard Square Rubber Seals

With over 700 stocked products, our off-the-shelf square rubber seals are available in a range of materials and sizes. We stock a small range of sponge square sections for sealing applications, as well as a selection of solid rubber square profiles. These products are normally immediately available and can be dispatched the same day on a next working day courier.

Expanded Neoprene (Skinned on 4 Sides) 

Skinned Expanded Neoprene has a smooth skin on all 4 sides. It is manufactured from a closed-cell sponge material which does not absorb water so can be used for making watertight seals on hatches, lockers, doors and cabinets. This product is available in a range of square and rectangular shapes. 

Sponge Automotive Seals 

Our sponge automotive seals are suitable for various applications, such as making watertight seals to stop water ingress. Although they are primarily used for automotive applications, their unique shapes allow them to be used for other sealing projects. 

Expanded Silicone Strip (Skinned on 4 Sides) 

Expanded Silicone strip has a smooth skin on all 4 sides. It is manufactured from a white closed-cell sponge which does not absorb water. These profiles can be used to create watertight seals on cabinets, enclosures and hatches. 

Porthole Rubber Strip 

Porthole rubber strip is manufactured from a semi-soft Natural rubber and is commonly used for sealing brass and bronze port lights and vents. These sections are available in a selection of square and rectangular shapes.

Other Custom Rubber Seals

Custom rubber seals can be extruded in virtually any shape in most rubber compounds. Different profiles are suitable for different applications and selecting the correct shape, material and hardness is essential to ensure a long term sealing solution. Visit our  Custom Rubber Seal directory to view our range of made-to-order extrusion shapes, gaskets and custom products.

Contact Us With Your Requirements

With over 50 years’ experience within the rubber sealing industry, our team has extensive experience in identifying the best rubber seals, trims and gaskets for our customers. We are able to work with you to find the best rubber sealing solution for your project.

Complete the form below for a no obligation free quote. Once received our team will look into whether your requirements can be met by an off-the-shelf product or provide a quotation for a custom made solution. Please include details of the seal you require, including dimensions, materials, hardness and how many metres you require.

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