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PORON® 4701-30 : “Very Soft” Polyurethane

PORON® 4701-30 : “Very Soft” Polyurethane

Poron® grade 4701-30 foam is very soft and easily compressed for use where flexibility is a key requirement. The unique cellular properties allow for consistent closure force and very limited stress relaxation and compression set in sealing, cushioning, and gap filling applications.


  • Resistance to Stress Relaxation and Compression Set
  • Vibration and Impact Energy Absorption
  • Low Outgassing
  • Broad Service Temperature Range
  • Flame Retardant
  • Fabricates by Die Cutting, Water Jet, and Laser
  • Consistent Thickness and Cell Structure
  • RoHS Compliant
  • Excellent Technical Assistance and Sample Support


PORON® grade 4701-30 open cell polyurethane foam is very soft and easily compressed for use where flexibility is a key requirement.  It is offered in three densities (15, 20, and 25 lbs/ft3) providing a range of properties within the product family.  The standard available thicknesses range from 0.031" to 0.500" (0.79 mm to 12.7 mm).  It is available in both unsupported and PET supported grades for dimensional stability in a soft foam.

Property Value
Density, lb/ft3 (kg/m3) 15 (240) 20 (320) 25 (400)
Thickness, in (mm) 0.188-0.500
Compression Force Deflection, psi @ (25%) 1-5 3-8 5-12
Hardness, Shore “O” <3 8 16
Compression Set, max % 2 @ 23oC
10 @ 70oC
Service Temperature, Continuous Rec. High: 194oF (90oC)
Low: -60oF (-51oC)
Flammability, UL 94HBF, @ in thickness
(File E20305)
>0.188 >0.093 -
UV Resistance “Good”
Color Black
Material Width, in 54
Format Availability Fabricated Parts, Foam Tapes, Rolls, Sheets
Thermoformable No
RoHS Compliant Yes
Halogen Free No
INSUL-FAB PN Varies – See Availability Chart
Supplier Data Sheet PORON® 4701-30 Data Sheet

 PORON® microcellular polyurethane products are fine pitch open cell foams produced by Rogers Corporation.  Their unique properties allow for consistent closure force and very limited compression set in sealing, cushioning, and gap filling applications. 

Stress Relax Comparison Chart

Elevated temperature is used to simulate accelerated aging, indicating long-term performance of Rogers PORON® compared to other common foam products used in gasket and seal applications.

Compression Set

In addition to grade 4701-30 “Very Soft”, they are available in a variety of product types from .004” (.10mm) to .500” (12.7mm) thick for converted applications in sealing, cushioning, and gap filling.  Click here for a full listing of PORON® products

Roger Corporation Insul-Fab is proud to be designated a Major Converter for Rogers Elastomeric Materials Solutions (EMS) and we commonly have many of their standard products in stock for fabrication.  Our expertise in material fabrication and supporting OEM design and production applications spans over 50 years of serving a wide variety of markets.

Product Identification System

PORON® products are made in with varying density, thickness, sealing capability, compression recovery, and construction characteristics.  Unlike many other foams, PORON® is made to intended end-use thickness with a skin on both sides, rather than being skived down from a thicker bun or roll which exposes the cell structure but allows more thickness flexibility.  As a result, typical part drawing specifications call out a PORON® product identification.

Poron Product Listing

Standard Product Availability

Within the most common PORON® product lines there are many SKUs that are available as standard, and many more that are non-standard but available with minimum orders.  A listing of these products is shown below.  Please note, this information is subject to change.

PORON® 4701-30: Very Soft
Product Density (lbs/ft3) Thickness (in) INSUL-FAB PN
4701-30-15188-04 15 0.188 -
4701-30-15250-04 15 0.250 IF2235
4701-30-15375-04 15 0.375 IF3064
4701-30-15500-04 15 0.500 IF2236
4701-30-20062-04 20 0.062 IF2388
4701-30-20093-04 20 0.093 IF2362
4701-30-20125-04 20 0.125 IF2716
4701-30-25031-04 25 0.031 IF2437
4701-30-25035-04 25 0.035 -
4701-30-25045-04 25 0.045 IF2664
PORON® 4701-30: Very Soft – Supported with 2mil PET
Product Density (lbs/ft3) Thickness (in) INSUL-FAB PN
4701-30-20064-04 P 20 0.064 -
4701-30-20095-04 P 20 0.095 -
4701-30-25021-04 P 25 0.021 -
4701-30-25037-04 P 25 0.037 IF2794
4701-30-25047-04 P 25 0.047 -

 Click here for a complete listing of PORON® product availability or contact us to find out if the PORON® SKU you are looking for is available in stock.  Samples of any of the materials are generally available within 1-3 days of request.

In applications where the desired thickness is not available, Insul-Fab can laminate two layers of PORON® together with adhesive, or we can utilize another substrate, such as Formex or Lexan plastic film, to fill the desired gap and provide part rigidity while maintaining a stack-up of UL rated products for flammability requirements. 

Adhesive Backing and Lamination

Most applications for Rogers PORON® Polyurethanes require an adhesive backing with release liner for attachment in the end use, or as an assembly aid.  Insul-Fab laminates PORON® materials using pressure sensitive adhesives.  PORON® does not contain plasticizers, like many other foam products do, so long term bond strength is maintained.  While many products bond well to PORON®, we recommend the following laminating adhesives. 

Adhesive Construction
3M 467MP and 3M 468MP .002” and .005” unsupported acrylic
3M 9832 and 3M 9832HL .005” double-coated acrylic
Concote CC593 .004” double-coated acrylic

Adhesive selection should be influenced by the end-use attachment substrate, the configuration of the part, and the application use conditions.  Unsupported acrylic adhesives offer an excellent bond and ability to conform to surface variations.  Double-coated or supported acrylics provide dimensional stability to larger parts or thin cross sections, to prevent stretching during end use application.

Other applications require the addition of a laminated film for surface protection, cosmetics, dimensional stability, or surface sliding.  We have available films such as PET, Formex, and Lexan for these occasions.


  • Environmental Seals
  • Foam Tapes
  • Motor & Fan Mounts
  • Vibration Isolation & NVH
  • Gaskets
  • LED Light Seals
  • Air Gap Filling for Thermal Management
  • IP Rated Enclosure Door Seals
  • Battery Support Pads
  • Spring / Rebound Pads
  • Appliance Foot Pads & Anti-Slip
  • Sound Damping
  • Transportation Interiors
  • Cable Grommets & Pass-Throughs

Poron 4701 30

PORON® is an ideal material for many applications for air, dust, or light sealing.  Despite being open cell, it can also be used effectively for moisture and water immersion gaskets and seals, with the proper material grade and compression.

Many Rogers PORON® products carry a UV Resistance rating of “good”, per ASTM G 53-96, but we do not recommend them for extended use in direct sunlight applications.  For options, consider materials we offer made from silicone or EPDM.

For assistance choosing the right PORON® material for your application, try the interactive PORON® Product Properties Guide.


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The Rogers logo and PORON® logos are trademarks of Rogers Corporation or one of its subsidiaries.  © 2019 Rogers Corporation.

The technical data provided on this page is intended to assist you in material selection.  It is not intended to and does not create any warranties, express or implied.  The user should determine the suitability of the material for each application.



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