Gloved operator feeding sheet stock into a press on the shop floor

ISO 9001:2015 Certified · Nashik, India

Sponge and Foam Rubber,
Manufactured in India

Closed-cell and open-cell cellular elastomers moulded, extruded and die-cut at our ISO 9001:2015 certified plant in Nashik, India — engineered for thermal insulation, acoustic damping and precision sealing, from EPDM weatherstripping to silicone medical-grade profiles.

Request a QuoteSponge & Foam Rubber Datasheet
5
Compounds
2
Cell structures
12–200 kg/m³
Density range
Sheet · Roll · Piece
Supply form

CELL MORPHOLOGY

Closed Cell vs Open Cell

Specifying cell structure is the first decision in foam engineering. It controls water absorption, compression set, thermal resistance and acoustic performance simultaneously — which is why it comes before compound, not after it.

Closed Cell Structure

Sealed membrane

Water absorption
< 1% by volume
Thermal resistance
High — cells trap gas
Compression set
Low — recovers fully, to ASTM D395 Method B
Typical density
30–200 kg/m³
Best for
Weatherseals, insulation, HVAC

Open Cell Structure

Interconnected pores

Water absorption
High — pores interconnect
Acoustic damping
Excellent — absorption rises with thickness and airflow resistance
Compression set
Higher — softer recovery
Typical density
12–60 kg/m³
Best for
Acoustic panels, filters, padding

MATERIAL SCIENCE

Compound Selection Guide

Five elastomer families, each optimised for distinct thermal, chemical and mechanical operating envelopes. Pick the tab that matches your environment; the full comparison is in the table below.

Selected Compound

EPDM

Ethylene propylene diene monomer

Hardness Range
20–80 Shore A
Service Temperature
−50 to +120 °C constant +130 °C intermittent

Key Applications

HVAC gaskets, roofing tape, weatherseals, hot-water systems

COMPOUND REFERENCE

All Five Compared

CompoundFull nameHardnessService temperatureKey applications
EPDMEthylene propylene diene monomer20–80 Shore A−50 to +120 °C constant +130 °C intermittentHVAC gaskets, roofing tape, weatherseals, hot-water systems
CRChloroprene (neoprene)25–70 Shore A−40 to +75 °C constant +90 °C intermittentMarine seals, refrigerant lines, adhesive tape backing
NBRNitrile butadiene rubber30–90 Shore A−40 to +100 °C constant +120 °C intermittentHydraulic seals, oil-resistant gaskets, fuel system foam
NRNatural rubber20–60 Shore A−55 to +80 °C constantAnti-vibration mounts, acoustic panels, packaging foam
VMQSilicone (vinyl methyl)10–80 Shore A−60 to +200 °C constant +230 °C intermittentClean-room seals, food-contact grades, high-temperature ovens

Sponge grades carry lower service temperatures than the same compound in solid rubber. The cell structure degrades before the polymer does, so a closed-cell EPDM sponge is rated below a solid EPDM moulding — the figures above are cellular ratings to ASTM D1056 and are not the same as the solid-compound table published elsewhere on this site. Constant service is the figure to design to; intermittent covers short excursions, not duty. Density and cell structure both shift these limits, so confirm against the grade quoted for your part.

PHYSICAL PROPERTIES

Density — The Engineering Variable

vs

LOW · 12–30 kg/m³

acoustic, packaging

HIGH · 80–200 kg/m³

structural, sealing

12 kg/m³Density200 kg/m³
Density is not a secondary spec — it determines whether your foam seals, insulates, or absorbs. Specify it from the start.
— Engineering TeamMargo Rubber Products · Nashik
12–30 kg/m³
Ultra-light acoustic and packaging foam
30–60 kg/m³
Standard HVAC duct liner
60–100 kg/m³
Weatherseal and gasketing applications
100–200 kg/m³
Structural foam and load-bearing pads

PRODUCT SUB-CATEGORY

SELF-ADHESIVE SYSTEMS

Self-Adhesive Foam Tape

Pre-applied pressure-sensitive adhesive converts any foam compound into an instant-bond sealing tape. The assembly step it removes is the one that causes most field failures — a separately applied adhesive cures at whatever rate the line allows, on whatever surface preparation the operator had time for. A factory-laminated tape arrives with the bond already made.

Cross-Section Build-Up

  • Foam core (EPDM or CR)
  • Acrylic or rubber adhesive
  • Release liner (PE / silicone)

Foam Core Comparison

EPDM foam tape

Temperature
−50 to +120 °C constant
Resistance
Excellent UV and ozone resistance
Used for
Outdoor weatherseals, curtain-wall expansion joints, HVAC flanges

CR (neoprene) foam tape

Temperature
−40 to +75 °C constant
Resistance
Good oil and flame resistance
Used for
Marine hatches, refrigerant pipe wrap, fire-door perimeters

Adhesive System Comparison

Acrylic adhesive

Exterior
High temperature resistance to +150 °C
excellent long-term bond durability
good UV and solvent resistance
slower tack, requires dwell time

Rubber adhesive

Interior
Immediate high tack, instant bond
excellent peel strength on irregular surfaces
cost-effective for interior use
lower temperature ceiling, to +80 °C

Engineering Note

Surface energy of the substrate determines adhesive selection. For low-surface-energy substrates such as PP, PE or powder-coated panels, specify acrylic adhesive with a primer or corona pre-treatment. For metals and glass, either system performs; rubber adhesive delivers superior initial grab.

APPLICATIONS IN THE FIELD

In Production

Margo foam compounds installed across four critical industrial environments.

  • Insulated HVAC ductwork running through a plant roof voidEPDM CLOSED CELL

    HVAC insulation

    Pipe wrap and duct liner rated for −50 °C to +120 °C service

  • Digital calipers measuring the section of a moulded rubber sealNBR / CR SHEET

    Industrial gaskets

    Die-cut gaskets for oil-resistant and refrigerant environments

  • Rubber weatherseal along a car window frame, beaded with rainEPDM SPONGE

    Automotive seals

    Extruded door and window seals, with ozone and weathering resistance tested to ISO 1431-1

  • Moulding machines in line on a rubber production floorVMQ SILICONE

    Clean-room foam

    Food-contact and biocompatible grade profiles for pharmaceutical and food processing environments

ENGINEERING BRIEF

Specify Foam in Four Lines

Our engineers can size a compound and a density from four operating parameters. No lengthy RFQ forms — just these four data points, and a recommendation back within 48 hours.

Temperature
e.g. −30 °C to +110 °C
Minimum and maximum service temperature in °C. Include any cyclic or shock excursions — constant duty and intermittent excursion are different specifications on cellular rubber.
Fluid contact
e.g. R-410A + UV exterior
List any chemicals, oils, UV, ozone or steam the foam will contact.
Duty cycle
e.g. static seal, 50% compression
Static seal or dynamic compression? Cyclic frequency if known, and the closing force available.
Compression set
e.g. < 25% after 70 h
Maximum allowable permanent deformation after long-term compression. We test to ASTM D395 Method B as standard.

MARKET COVERAGE

Sectors & Applications

Nine sectors served, each with its own compound preference. Each card links through to the industry page for the moulded and extruded parts we make alongside the foam.

IN THIS CATEGORY

Sponge & Foam Parts We Make to Order

Each part below is manufactured to customer drawing or to our standard tooling. Full dimensional data is issued with the quotation.

  1. 01

    C-Pillar Garnish Seal

    Made to order

  2. 02

    Foam Gaskets

    Made to order

START THE CONVERSATION

Send the closing force available and the gap to be sealed.

Those two numbers decide density and cell structure before anything else is discussed. Send them with the temperature range and what the foam will contact, and our engineers respond within 48 hours with a compound, a density and a cut form — or send a sample of the foam you are replacing, which answers all four at once.

Request a QuoteSponge & Foam Rubber Datasheet