Sponge & Foam Rubber · Made to order
Foam Gaskets — Closed-Cell Sponge for Low-Closing-Force Seals
Closed-cell foam gaskets for enclosures, covers and light housings — they seal under light, uneven clamp, where a solid gasket would need bolt load the panel cannot give. Die-cut or moulded to ASTM D1056 type, class and grade, at our plant in Nashik.
- TEMPERATURE
- Per sponge grade — see section 03
- THICKNESS
- Sheet or bun thickness
- WIDTH
- Maximum blank size
- CELL STRUCTURE
- Closed cell
- DENSITY
- Per grade, kg/m³
- ASTM D1056
- Type, class and grade — e.g. 2C1
- MADE TO ORDER
- ISO 9001:2015
- 09111526A
Product gallery
Visual Reference
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Cross section viewGasket profile on request under NDA
- Max width
- Maximum blank size — to your drawing
- Thickness
- Uncompressed thickness — to your drawing
- Run length
- Extruded sponge cord and strip are supplied by the metre
- Working compression
- Typically 25–50% of free thickness
- Adhesive backing
- Plain, or self-adhesive with a peel liner
- Form
- Die-cut, moulded or extruded
Gasket profile available on request. Send the groove or flange dimensions and the gap you need to close, and we will return a dimensioned drawing with the compression stated.
Technical specifications
Engineering Data
- Product Family
- Sponge & Foam Rubber
- Material
- Closed-cell sponge — EPDM, neoprene, silicone or NBR
- Compression force deflection (CFD)
- Force to compress 25%, per ASTM D1056 grade
- Operating Temperature
- Per sponge grade — see section 03
- Compression Set
- Tested to ASTM D1056
- Density
- Per grade, kg/m³
- Colour Options
- Black standard, custom RAL on request
- Lead Time
- Confirmed with the quotation, from approved drawing and approved sample
- Cell structure
- Closed cell
- ASTM D1056 designation
- Type 2 (closed cell), class per oil exposure, grade per CFD
- Working compression
- 25–50% of free thickness, typical
- Adhesive backing
- Plain or self-adhesive with peel liner
- Certifications
- ISO 9001:2015 — certificate 09111526A, valid to 21 February 2027
- Minimum Order
- 10,000 pieces per part number, per compound, or quoted against the part where geometry or tooling makes that unrealistic. Prototype and first-article lots sit outside the minimum.
Dimensional reference
- Max width
- Maximum blank size — to your drawing
- Thickness
- Uncompressed thickness — to your drawing
- Run length
- Extruded sponge cord and strip are supplied by the metre
- Working compression
- Typically 25–50% of free thickness
- Adhesive backing
- Plain, or self-adhesive with a peel liner
- Form
- Die-cut, moulded or extruded
Available materials
Rubber Compound Options
Select the compound best suited to your operating environment and application requirements.
Compound
EPDM sponge
Ethylene Propylene Diene Monomer
Temperature range
−40 to +100 °C
For this part
The default foam gasket. Weather, ozone, UV and water — the outdoor and enclosure compound, and the cheapest of the sensible options.
Compound
Neoprene sponge
Polychloroprene (CR)
Temperature range
−40 to +75 °C continuous, +90 intermittent
For this part
Where the gasket sees oil mist or fuel vapour.
Compound
Silicone sponge
Vinyl Methyl Silicone (VMQ)
Temperature range
−60 to +200 °C
For this part
The high-temperature answer — ovens, lighting, exhaust-adjacent enclosures. Correct product, wrong default: it is the most expensive of the four
Compound
NBR sponge
Nitrile Butadiene Rubber
Temperature range
−30 to +100 °C
For this part
Direct liquid oil contact, where neoprene is not enough
Compound
SBR sponge
Styrene Butadiene Rubber
Temperature range
−30 to +80 °C
For this part
Low-cost indoor packing and cushioning — not a weather seal
Compound
Natural rubber sponge
Polyisoprene (NR)
Temperature range
−20 to +70 °C
For this part
Impact cushioning. Poor ozone resistance — perishes outdoors
Compound
FKM
Fluoroelastomer (Viton)
Temperature range
—
For this part
Not normally produced as sponge, and the cost is not justified in a gasket
Compound
AEM
Ethylene Acrylic Elastomer (Vamac)
Temperature range
—
For this part
Not normally produced as sponge — specified as a solid for hot oil-mist service
Not sure? Send the medium, temperature and load
CELL STRUCTURE
Closed cell
seals against air and water
Key advantages
Why Specifiers Choose Margo
Seals without clamp load
A sheet-metal cover or plastic housing cannot generate the bolt force a solid gasket needs. Closed-cell sponge seals at a fraction of it, and takes up the gap variation a pressed panel always has.
Closed cell, not open cell
Open-cell foam absorbs water and passes air — it cushions, it does not seal. Every gasket grade we supply is closed cell unless you specify otherwise.
Specified to ASTM D1056
Type for cell structure, class for oil resistance, grade for compression force deflection. Give us the code and we will match it; give us the gap and the force, and we will name it.
Sponge runs cooler than solid
A sponge grade does not reach its solid equivalent’s temperature — neoprene sponge is about +75 °C continuous, not +120 °C. We quote the sponge figure, which is the one your gasket will actually see.
Industries served
Global Applications
Electrical & Enclosures
Control panels, junction boxes, outdoor cabinets, and the gasket is what carries the enclosure’s IP rating under IEC 60529
Automotive
Body and trim sealing, lamp housings, HVAC ducting joints — where light clamp is all that is available
Heavy Industry
Machine guards, access covers, acoustic and dust sealing on plant enclosures
Infrastructure
Expansion-gap, window and cladding sealing
Manufacturing process
From Compound to Certification
Material compounding
Polymer blending with the blowing agent that forms the cell structure, and batch QC in our in-house lab.
Tool or die design
Cutting dies for flat gaskets, moulds for shaped ones, made in-house and held as a controlled record.
Expansion cure
The compound is cured as sheet or bun and expands to the specified density. This is the step that makes it sponge, and it is the step the live page omits.
Die-cutting or skiving
Bun stock skived to thickness, gaskets cut to profile, self-adhesive backing applied where specified.
Quality inspection
Density and compression force deflection checked against the D1056 grade, plus dimensional check and batch sampling.
Export packaging
Industrial packing with documentation. Sponge is packed uncompressed; stacking under load takes a set that does not recover. ISPM-15 treated pallets where timber is used.
Quality assurance
Certified to International Standards
Every product leaves our facility with a documentation package — material test reports, dimensional inspection sheets and a certificate of conformance — giving traceability from raw material to finished part.
ISO 9001:2015 · Certificate 09111526A
Integral Certification Ltd · Valid to 21 February 2027
Scope: rubber moulded components — quality management, not a product approval
Production metrics
- Since 2005
- In operation
- 60+
- Active clients
- 3–4 weeks from approved sample
- Avg. lead time
Downloads
Technical Documentation
Sponge grade tables and gasket profiles are issued on request, under NDA where required. Tell us the gap, the closing force available and the medium — DXF or PDF for the profile — and we will send the grade that fits.
Request the sponge grade tableFAQ
Technical & Commercial Questions
Answers to the most common questions from engineering teams and procurement managers worldwide.
What is the minimum order quantity for this part?
We supply in bulk. The minimum run is 10,000 pieces per part number, per compound, or quoted against the part where geometry or tooling makes that unrealistic. Prototype and first-article lots sit outside the minimum.
Can you match a competitor specification or reverse-engineer an existing part?
Yes. Send the sample or the ASTM D1056 code. Measure a sponge sample uncompressed and off the panel — a gasket that has been clamped for a year measures thinner than it was cut, and matching the compressed thickness gives you a gasket that will not seal.
What file formats do you accept for drawings?
PDF, DWG and DXF. For a die-cut gasket a flat DXF outline is ideal. Mark the free thickness, the compressed thickness you need, and whether the part needs self-adhesive backing. A 3D model is not required.
Do you provide material test reports with each shipment?
Yes. Material test reports, dimensional inspection sheets and a certificate of conformance ship with every consignment. For sponge grades we report density and compression force deflection against the ASTM D1056 designation — not Shore A hardness, which is not a sponge measurement.
What are your payment and delivery terms for international orders?
TT and LC accepted, discussed per order. Ex-works Nashik or FOB Nhava Sheva. Commercial invoice, packing list and certificate of origin are issued with every consignment. Sponge is shipped uncompressed, which affects volumetric freight.
Same compound
Other parts we mould in the same compounds
- NBR Rotary Shaft Seals — the Standard Oil Seal · NBR
- Plunger Seals & Plunger Cups — Moulded for the Fluid You Pump · EPDM, Neoprene, Silicone, NBR
- Body Mount Pad — to Suit Mahindra Bolero · EPDM, Neoprene, Silicone, NBR
- Silicone Rotary Shaft Seals — High-Temperature, Low-Speed Service · Silicone
- Flat Packing Pad — Moulded to Your Load and Gap · EPDM
- EPDM Rotary Shaft Seals — Water, Coolant and Steam · EPDM
Need this part quoted?
Send your drawing, a sample, or just the gap and the closing force you have. We confirm the grade, density and thickness, then quote against your annual quantity. We respond within 48 hours.