Post Office Sponge Sheets
At Advanced Seals & Gaskets Ltd, we offer a comprehensive range of sponge, foam, and rubber sheet materials, including the unique Post Office Sponge, also known as orange open-cell natural sponge.
Post Office Sponge is manufactured and stocked in buns (blocks) of various sizes and thicknesses, up to 80mm, depending on density. Using state-of-the-art splitting machines, we can convert these blocks into sheets starting from 1.5mm thick, with standard dimensions of 2m x 1m, or cut to bespoke sizes and pads as required.
Our on-site laminating service allows us to laminate layers to create thicker sheets or coat sheets with self-adhesives, foils, or composite materials. These sheets provide flexibility for customers to cut strips, gaskets, pads, or cover large surfaces while reducing waste and joins.
Product Enquiry
For information on Post Office Sponge Sheets please complete the following quick enquiry or call us on +44(0)1384 252555.
Key Characteristics of Post Office Sponge Sheets
- Colour: Bright Orange
- Structure: Open-cell (fine or medium)
- Density: 140 – 600 kg/m³
- Sheet Size: Up to 2120mm x 920mm (depending on density)
- Temperature Range: -40°C to +80°C
- Tensile Strength: 0.23 – 1.2 N/mm² (varies by density)
- Elongation at Break: 455% – 817% (varies by density)
- Resistances: Not resistant to ozone, acids, alkalis, oils, fats, or solvents
- Flammability: Highly flammable
Full technical data is available upon request or downloadable from our online portal.
What are Post Office Sponge Sheets?
Post Office Sponge, or orange open-cell natural sponge, is made from high-quality natural rubber. It is available in different densities (160 – 600 kg/m³) and pore sizes, creating soft or firm sheets suited to a wide range of applications. Its bright orange colour and open-cell structure make it highly absorbent, ideal for capturing liquids.
Sheets are split to order from master blocks in thicknesses starting at 1.5mm, with standard sizes 1m x 1m or 2m x 1m. Sheets can be supplied plain, self-adhesive, or laminated with other materials. This flexibility allows smaller quantity orders to save cost and reduce waste.
Why Use Post Office Sponge Sheets?
Post Office Sponge sheets are ideal for wet applications, including labelling, packaging, and vacuum lifting. While not resistant to oils, acids, or alkalis, this material can be converted into rollers, pads, washers, strips, or other finished products.
Sheets are available in various densities, pore sizes, and firmness, allowing them to be used across multiple applications. Laminations and adhesives can be applied to suit specialist uses or thicker sheets, while retaining the material’s excellent absorbency and compressive recovery.
Benefits of Using Open-Cell Natural Sponge
- Good abrasion resistance
- Soft and flexible, ideal for uneven or complex shapes
- Open-cell structure allows water absorption
- Excellent recovery after repeated compression
- Good tear resistance
Other Grades of Sponge Materials Available
- EPDM: Medium, firm, semi-open cell, high temperature
- Neoprene: FR, medium, firm
- Silicone
- Polyurethane
- Open-cell industrial sponge
The Advantages of Using Post Office Sponge Sheets
Post Office Sponge sheets are available in soft or firm densities, offering excellent absorbency for wet applications such as packaging, paint pads, rollers, and floats. Their open-cell structure allows moisture circulation, while the material’s compression recovery ensures longevity in repetitive loading or high-use applications.
Sheet sizes are available up to 2120mm x 920mm, with thicknesses up to 80mm. They can be split, laminated, or converted into finished parts such as washers, gaskets, strips, pads, or discs, making them highly versatile for industrial, packaging, and wet environment applications.
Please contact us using the form below or by calling us on +44(0)1384 252555.