Closed Cell Sponge Rubber & Plastic Foam Manufacturer - Made in The USA.
Monmouth Rubber & PlasticsWe make it in America and Ship Worldwide.
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Durafoam and Duraflex are available in some of the following types of rubber:

Closed Cell Sponge Rubber & Plastic Foam Manufacturing:
Durafoam™ is our INDUSTRY-LEADING closed cell sponge rubber and plastic foam.
NEW! Check it out after you read this page
Among closed-cell and open-cell foam, there are many variations we are familiar with in our everyday lives. We’ll outline a few popular types below, along with some of their applications.
Common Types of Closed-Cell Foam
Neoprene Foam — A soft, flexible, and highly durable sponge rubber, neoprene foam offers excellent thermal and moisture insulation, and is resistant to Ozone, sunlight, and oxidation, as well as many chemicals and petroleum derivatives. Neoprene has a unique molecular structure that renders it resistant to breakdown by water and air. As such, it is commonly used in athletic equipment like gloves, wetsuits, and knee pads.
Crosslinked Polyolefins — A strong and resilient foam commonly used in shock-absorbing products, polyethylene makes for an excellent packing material. Its strength lends it to packaging applications for items that will travel long distances or may not be handled with care during transport. Polyethylene foam is shatterproof, non-dusting, flexible, impervious to mold, mildew, rot, and bacteria, and is available in various densities to match the demands of different applications.
Other examples of closed-cell foam rubber include gym rubber, which makes excellent activity flooring, and cross-linked polyethylene, a carvable material popular in outdoor and marine applications.
Physical Properties
- Outstanding sound absorption
- Excellent shock absorption
- High strength-to-weight ratio
- Superior insulation against heat and cold
- Exceptional Flotation
Available in conductive, non-conductive and fire-retardant versions, Durafoam contains co CFC’s or HCFC’s. It’s also ROHS compliant and 100% recyclable.
The Choice of Industry Leaders in a Wide Variety of Markets
- Transportation
- Construction
- Athletic
- Water Sports
- Medical
- Marine
Durafoam DK Series
The Durafoam DK series offers fabricators a one-stop shop for competitively priced materials that meet 80% of all
the specifications you require, and offers the fabricator a one-stop shop at competitive pricing for:
- UL 50E – Std safety for enclosures for electrical equipment
- UL 508 – Std for safety industrial control equipment
- UL 157 – Std for safety for gasket and seals
- UL 94 HF1 – Std for safety for test for flammability for plastic materials
Rubber Library – Your Resource: Common Types of Rubber
Mobile devices view chart in landscape
UL GASKETS
Sheets of “Closed Cell UL Gaskets” available in our UL Listed Durafoam DK Series -
UL Listed Closed Cell Sponge Rubber & Plastic Foam.
Only The Durafoam Dk Series Is:
U.L. Recognized for all 5 Hardnesses to UL 50E, UL 157, UL 508, UL 94HF-1
All 5 Hardnesses are also listed To Canadian Listing CAN/CSA C22.2 NO. 017-92.
DK1111, DK2121, DK3131, DK4141, DK5151
UL Listed EPDM/NEOPRENE Closed Cell Rubber Blend, Durafoam™ DK Series (DK111, DK2121, DK3131, DK4141, DK5151)
UL Recognized DURAFOAM DK SERIES CLOSED CELL RUBBER is the only full line of ASTM SCE 41 THROUGH SCE 45 that is recognized to UL 50, UL 157, UL508, UL 94HF-1, and CANADIAN LISTING CAN/CSA C22.2 NO. 017-92
RoHS REACH Prop 65 Berry Certificate Conflict Minerals SDS ISO 9001:2015 Recycled/Sustainability
DURAFOAM | DK1111 | DK2121 | DK3131 | DK4141 | DK5151 |
COLOR | BLACK | BLACK | BLACK | BLACK | BLACK |
DENSITY (PCF APPROX.) | 6 +/- 2 | 6 +/- 2 | 9 +/- 2 | 10 +3/-2 | 13 +/- 4 |
POLYMER See Note B: | NEO/EPDM POLYMERIC BLEND | NEO/EPDM POLYMERIC BLEND | NEO/EPDM POLYMERIC BLEND | NEO/EPDM POLYMERIC BLEND | NEO/EPDM POLYMERIC BLEND |
ASTM-D-1056-67 & 68, GRADE # | SCE 41 | SCE 42 | SCE 43 | SCE 44 | SCE 45 |
ASTM-D-1056-91 & 07 SAE J18-R7/92 | 2C1 | 2C2 | 2C3 | 2C4 | 2C5 |
COMPRESSION SET, SUFFIX B2 25% MAXIMUM | PASS | PASS | PASS | PASS | PASS |
COMPRESSION DEFLECT @ 25% DEFLECTION | 2 - 5 PSI | 5 - 9 PSI | 9 – 13 PSI | 13 – 17 PSI | 17 – 25 PSI |
WATER ABSORP. BY WEIGHT MAX, ASTM MTHD. | 5% (10% ALLOWED) | 5% (10% ALLOWED) | 5% (10% ALLOWED) | 5% | 5% |
TEMPERATURE RESISTANCE Low ºF/High ºF See Note A | -40/+250 | -40/+250 | -40/+250 | -40/+250 | -40/+250 |
ELONGATION % Min | 150 | 150 | 150 | 150 | 150 |
HEAT AGING, 7 days @ 158ºF) +/- 30% MAX CD CHANGE | PASS | PASS | PASS | PASS | PASS |
TENSILE STRENGTH Min. | 75 psi | 100 psi | 100 psi | 125 psi | 150 psi |
OZONE 20% STRESS, 72 HRS @100 PPHM, ASTM-D- 1171-94; 1149-91; GM6086M; GM4486P; CHRYSLER MSAY 527 | PASS | PASS | PASS | PASS | PASS |
OIL RESISTANCE, FLUID IMMERSION E1, 7 Days @ 23ºC or 74ºF | PASS | PASS | PASS | PASS | PASS |
FLAME RESISTANCE TO UL 94 HF1, FMVSS302 | PASS U.L. #E208679 | PASS U.L. #E208679 | PASS UL #E208679 | PASS UL #E208679 | PASS UL #E208679 |
FLAME RESISTANCE TO CANADIAN CAN/CSA C22.2 # 017-92 | PASS U.L. #E208679 | PASS U.L. #E208679 | PASS UL #E208679 | PASS UL #E208679 | PASS UL #E208679 |
U.L. 50E, U.L. 157, & U.L. 508 | PASS U.L. #JMLU2 MH10200 | PASS U.L. #JMLU2 MH10200 | PASS U.L. #JMLU2 MH10200 | PASS U.L. #JMLU2 MH10200 | PASS U.L. #JMLU2 MH10200 |
NOTE A: For temperature resistance lower and/or higher than the above figures, please contact technical assistance. Under certain
conditions, values greater than -40/+250 are possible.
NOTE B: Monmouth’s materials are manufactured to ASTM-D-1056 and other related ASTM Standards. ASTM specifies physical performance, notpolymers nor polymer content. Monmouth’s lab is equipped to certify to all the ASTM specifications either customer specified or on our physical properties chart. If a particular polymer or polymer content is required, please contact John Sr. with your specific requirements.
DISCLAIMER: To the extent that the above product information is derived form sources other than Monmouth Rubber, Monmouth Rubber is substantially, if not wholly, relying upon the other source(s) to provide accurate information. Information provided as a result of Monmouth Rubber’s own technical analysis and testing is accurate to the extent of our knowledge and ability, using effective standardized methods and procedures. Each user of these products, or information, should perform their own tests to determine the safety, fitness and suitability of the products, or combination of products, for any foreseeable purposes, applications and uses by the user and by any third party to which the user may convey the products. Since Monmouth Rubber cannot control the end use of this product, Monmouth Rubber does not guarantee that the user will obtain the same results as published in this document. The data and information is provided as a technical service, and the data and information is subject to change without notice. When considering the above product as a competitive equivalent material, please keep in mind that some materials have unique physicals that are not part of the recognized industry specifications and standards. Therefore, customer sample evaluation and approval of any substitution is suggested.
Monmouth Rubber will supply free of charge evaluation & testing of its materials to assist customers in their evaluation. For technical evaluation and support, please contact John M. Bonforte, Sr., 1-732-229-3444 Ext 112, or email John Sr.
Durafoam DK Series UL Chart [PDF Download]
Have a Technical Question?
“Ask John” is Monmouth’s global technical support service. It is FREE and brings real value to your company. It allows Monmouth’s customers and visitors to have a 24/7 Technical Library & Test lab, absolutely FREE.
Neoprene Explained
Neoprene was the world’s first fully commercial synthetic elastomer
EVA Explained
Ethylene-vinyl acetate (EVA) is the copolymer of ethylene and vinyl acetate.
ASTM D 1056 explained
Standard Specification For Flexible Cellular Materials
UL Gasket Materials explained
Underwriters Laboratories has a set of industry standards that it uses to test electronic components, including gaskets.
The Shelf Life of Rubber explained
With the above in mind, it is important not to confuse Shelf Life with Service Life.
CONTACT US
INT’L PHONE:
(732) 229-3444
TOLL FREE:
(888) 362-6888
FAX:
(732) 229-0711
EMAIL:
sales@monmouthrubber.com
Our Team
Team Monmouth's commitment is to bring ongoing value to our customers. We constantly strive to improve products and services that meet your needs and exceed your expectations. Please select one of our team members below to discuss how we can help you!





Cut It. Coat It. Form it. It will do just about anything you want it to do.
Whether you’re looking for open cell sponge rubber, solid sheeting or closed cell plastic foam, you can count on Monmouth Rubber & Plastics to deliver the materials you want.
DURAFOAM™
Closed Cell Sponge Rubber and Plastic Foam
DURAFLEX™
Solid Rubber
and Plastic Sheeting
BONDAFLEX™
Recyled Composites of Rubber and Plastic
BUNS
Closed Cell Sponge Rubber & Plastic Foam
SHEETS
Closed Cell, Open Cell & Solid Rubber
ROLLS
Closed Cell Sponge Rubber and Plastic
FOAM TAPE
Closed Cell Tape, Strip & Pressure Sensitive
NEW! Equivalents to any current or obsolete Rubatex, Ensolite or ANR stock Competitive Stock Number Equivalency Charts:
1. Durafoam™ Stocks Comparable to Rubatex® Stocks - View Chart
2. Durafoam™ Stocks Comparable to Ensolite® Stocks - View Chart
REQUEST SAMPLES Rubber & plastic foam materials Read more>
FREE TECH SUPPORT Global support and Solutions Read more>
TRASH FOR CASH Recycling Program Read more>
"ASK JOHN" - Q&A With John Bonforte, Sr. Read more>
IN THE NEWS Monmouth Rubber & Plastics Read more>
TECHNICAL LITERATURE Articles, Releases & Data Sheets Read more>
CONVERSION TOOLS Variety of different measurements. Read more>
PRICING & SALES SUPPORT Call or write us Read more>
- REQUEST SAMPLES Rubber & plastic foam materialsRead more>
- FREE TECH SUPPORT Global support and Solutions Read more>
- TRASH FOR CASH Recycling Program Read more>
- "ASK JOHN" - Q&A With John Bonforte, Sr. Read more>
- IN THE NEWS Monmouth Rubber & Plastics Read more>
- TECHNICAL LITERATUREArticles, Releases & Data Sheets Read more>
- CONVERSION TOOLS Variety of different measurements.Read more>
- PRICING & SALES SUPPORTCall or write us Read more>
EXPLAINED
Neoprene explained,
what is it?
Neoprene was originally used as an oil resistant replacement for natural rubber.
by Monmouth Rubber & Plastics
EVA explained,
what is it?
Broadly speaking, there are three different types of EVA copolymer.
by Monmouth Rubber & Plastics
ASTM D 1056
explained
American Society For Testing Materials D1056 (ASTM D1056)
by Monmouth Rubber & Plastics
UL Recognized Gasket Materials
Underwriters Laboratories - UL Gaskets are tested using the Standard for Safety of Gaskets and Seals.
by Monmouth Rubber & Plastics
The Shelf Life
of Rubber
Shelf life of rubber is a simple question with a complex answer.
by Monmouth Rubber & Plastics
JUST ASK JOHN
FREE TECH SUPPORT

John Bonforte Sr.
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News You Can Use
on Closed Cell Sponge Rubber & Plastic Foam Materials and New Developments. By John Bonforte, Sr.