Sponge and foam are ideal materials for low pressure sealing applications for liquids and air. They are also used for preventing damage to parts.

Sponge – Noun

A piece of a soft, light, porous absorbent substance originally consisting of the fibrous skeleton of an aquatic invertebrate but now usually made of synthetic material, used for washing and cleaning.

mass noun A soft, light, porous substance used as padding or insulating material.

‘the headguard is padded with sponge’

Foam – Noun

A mass of small bubbles formed on or in liquid, typically by agitation or fermentation.

A lightweight form of rubber or plastic made by solidifying liquid foam.

as modifier ‘foam rubber’

Source: OED.

No wonder there is sometimes confusion when people are trying to differentiate between sponge and foam. The main thing here, and it is only a general rule, is that sponge usually consists of open cells that absorb either air, liquid or moisture whereas foam is generally made of closed cells that repel air or moisture.

However it should be noted that when closed cell foam is compressed and the cells pop, it then takes on the characteristics of sponge as the cells are now open!

Fortunately with over 45 years experience in the sealing sector we are able to advise on the correct material for your application.

Open Cell

Open cell sponges and foams have excellent recovery and are used widely in the industrial sector for applications including, sound and vibration dampening, ejection dies for cutting formes, and product protection. Although open cell sponges will absorb air and liquids, when compressed they form an effective tight seal. We also offer a splitting service where one skin is removed from our Natural rubber open cell sponge to create strips suitable for the potato washing industry. Because air can pass freely between its cells, open cell sponge offers a high degree of compressibility and displays fast recovery upon release from compression. An open cell structure, therefore, has greater resistance to compression set, consequently making the material ideal for applications requiring repetitive loading or distortion.

Closed Cell

Closed cell sponges and foams are made through the process of foaming which creates an air filled matrix made up of cells or pockets. As these are closed, the cells repel air, liquids and moisture making an effective seal at low pressures. Closed cell sponges and foams are supplied in a wide range of styles, from die cut gaskets for low pressure seals, strips for weather protection and sheets. They can be supplied either plain or self-adhesive backed in our wide range of backings.

Scapa Single & Double Sided Foam Tapes

Scapa have specialist expertise in manufacturing and developing foam products for bonding, sealing, cushioning, protection, mounting and fixing applications.

The Scapa double-sided foam range provides solutions to practically every industry for bonding, mounting, fixing and joining applications. The products are economical, easy and quick to apply, clean to use, adaptable, versatile and consistent.

Scapa’s high performance double sided foam bonding materials consists of a wide range of PVC, PU and PE foams coated with a variety of adhesives. We can supply the foam tape range in a variety of formats including logs, rolls, spools, pads, discs, sheets, washers, gaskets or other die cut shapes to suit every application requirement.

Cord/Profiles

If you require cord, we stock a variety of different cords from 3mm to 25mm. These can be supplied as full coils, cut pieces, or joined to form rings.

We also offer a selection of sponge profiles.

Sponge & Foam

Please click on the links below to download data sheets on our most commonly stocked sponge and foam range. For additional products please click on Products from the main menu bar above.

Conforming to Building Regulations, this BS476 Part 6, Class 0 acoustic foam can be used as a fire seal and for noise reduction.
Blended sponge can be a more economical, as well as being a highly versatile product taking strengths from both materials it is manufactured from. Blends have excellent UV and water resistance.
EPDM sponge is the material of choice when resistance to Ozone, weathering and UV are the prime concerns. It performs better in these areas than either Neoprene or EPDM/Neoprene blends.
We supply a comprehensive range of sponge cords in both silicone and Neoprene in thicknesses ranging from 3mm to 25mm.
WCM180 is a good quality flame retardant Neoprene sponge which can be used where the risk of flame is evident. Care should be taken regards self-adhesive backings as most are not flame retardant.
Open-cell sponge rubber possesses an interconnected cell structure which will permit limited absorption and circulation of gases and fluids.
It is a flexible product, which can also dampen vibration, has good acoustic and sound deadening properties and has shock / energy absorbent qualities.
Polyethylene Foam has many key characteristics including excellent thermal insulation properties with excellent lower and upper temperature ranges.
This range of Open Cell Sponge Rubbers are a product of natural caoutchouc, which is rubber resin from the Hevea Brasiliensis tree.
PVC Nitrile sponge offers excellent oil and fuel resistance, is resistant to weathering and is also Class “0” flame retardant.
Silicone sponge is an excellent sealing medium, due to its stable chemical structure and good recovery. This grade is blue for easy identification.
This grade of Silicone sponge is blue for easy identification and contains food safe particles designed to be picked up by metal detectors.
Commonly used for filtration in air conditioning units, automotive and the ventilation industry, our range is available from 10 – 90 PPI.
Silicone sponge is an excellent sealing medium, due to its stable chemical structure and good recovery. We supply it in sheet, gaskets, extrusions and cord.
Viton™ Sponge is a closed cell formulation that is manufactured with a continuous skin on both sides. Viton™ Sponge is generally resistant to aliphatic and aromatic hydrocarbons, oil, fuels, Ozone and weather, lubricants, and animal or vegetable oils.
This material is a blend predominantly of EPDM with a small amount of Chloroprene. Being a closed cell sponge means the cells are not interlinked.

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