Rigid Polyurethane Foam

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Epoxy.com Logo - Epoxy, Polyurethane, Polysulfide, Polyester, MMA - Methyl Methacrylate and other Construction Resin Systems - Over 350 Products- Since 1980  


 Epoxy.com Product #425

Two-Component Rigid Polyurethane Foam



Epoxy.com Product #425 is a two component, HCFC-141b/water co-blown rigid polyurethane foam system designed for low-density insulation applications. PRODUCT #425 is typically used for floatation (Boat Foam) inside fiberglass parts. It bonds well to metals, wood and some plastics. This foam system meets Military Specification P-21929B.


Epoxy.com Product #425, for best property development, is mixed 1 to 1 by weight. Epoxy.com Product #425 can be mixed at 1 to 1 by volume it will still foam. Typically Epoxy.com Product #425 is mixed while being pumped through static mixers. The Epoxy.com Product #425 can be mixed by hand in small quantity (less than 8 ounces). It can also be mixed by mechanical means such as slow speed drill. Time is critical as the Epoxy.com Product #425 reacts very fast. Mix completely in 30 seconds and immediately pour in place. Over mixing can affect properties.


Store between 65-85 °F in dry area. Avoid sunlight, heat and freezing. Keep from moisture, which can create pressure and rupture container. Keep container closed. Empty container has product residue - recondition before reuse. Don't heat or cut with electric or gas torch. Keep waste polyols out of empty drum.

A COMPONENT WARNING! CAUSES IRRITATION. Keep out of eyes. Wear goggles. Avoid skin contact. Wear plastic or rubber gloves and protective clothing, if splashing is likely. Do not breathe vapor or mist. Keep container closed. Use with adequate ventilation. Wash after handling.

Fluorocarbon Blown Polyol - Store below 70°F. Keep away from direct sun. Cool below 70°F. Open bung carefully. Contents may develop pressure. If cooled below 50°F, gently warm to room temperature before opening. Do not put any waste isocyanates into this empty drum.

Water Blown Polyol - Store between 65-85°F. Keep away from direct sunlight. Open gradually to relieve any pressure build-up. Keep away from moisture. If cooled below 50°F, gently warm to room temperature before opening. Do not put any waste isocyanates into this empty container.

All polyurethane foam burns in varying degrees, which in turn liberates toxic gasses and should be evaluated in its final form for compliance to existing standards in your industry. The information presented herein is based on our own research and that of others and is believed to be correct, however, no warranty is expressed or implied. No statement herein extends any license, either expressed or implied, in connection with any patents issued or pending which may be the property of Stepan or others. The manufacturer shall not be liable (regardless of fault) to the vendee's employees, or anyone for any direct, special or consequential damages arising out of or in connection with the accuracy, completeness, adequacy or furnishings of such information.



In case of skin contact, wipe off using a clean cloth soaked with rubbing alcohol, then wash with soap and water. In case of eye contact, immediately flush eyes with water for at least 15 minutes. If breathing is difficult, go to fresh air. Call a physician.


INFORMATION: "B" COMPONENT WARNING! MAY CAUSE ALLERGIC SKIN OR RESPIRATORY REACTION. Vapor, mist and decomposition products are harmful, can be highly toxic and irritating. Avoid eye contact or prolonged or repeated skin contact. Don't breath smoke or gases from overheated material. Use only with adequate ventilation or respirator. If spilled on clothes or shoes, remove and clean before reuse.

Typical Foam Properties

Density    ASTM D-1622
Molded, overall pcf 3.4
Core, pcf 2.7
Yield cu.ft./gal. 3.0 ±
Compressive Strength, 10% deflection, ASTM D-1621  
   Parallel, psi 25.3
   Perpendicular, psi 30.5
Compressive Strength Change, Mil-P-21929B, % change 2.35
Initial K-Factor, ASTM C-518, BTU in/hr ft<= 0.141
Shear Strength, psi
   ASTM C-273
Tensile Strength, psi
   ASTM D-1623
Water Absorption  
   ASTM D-2842, lb/ft<= 0.083
   % by volume 4.7
Tumbling Friability,
   ASTM C-421
   % loss
"B" Component, polyol blend

Closed Cell Content
   ASTM D-2856, %


Compression Set, Mil-P-21929B, % loss


Oil Resistance
   ASTM D-471, Mil-P-21929B


Dimensional Stability
   ASTM D-2126, % volume change:



@ -20°F


100% R.H.

@ 100°F
100% R.H.

1 day





7 days





14 days





28 days





Typical Component Properties


"A" Component, polymeric MDI

"B" Component, polyol blend

Viscosity @ 25° C, cps



Specific Gravity @ 25° C



Mixing Ratio, % by weight



Typical Component Properties:

Hand Mix Reactivity @ 25°C

Cream Time, seconds


String Time, seconds


Packaging: 10 gallon unit consisting of 5 gallons of "A" and 5 gallons of "B".




Proper mixing and installation is critical to the optimal success of all product.  See Installation Tips, Techdata, & MSDS for more details on our products.  Be sure to contact us with any questions and/or concerns that you have.

For more information please contact:

A Division of Epoxy Systems, Inc
20774 W. Pennsylvania Ave.
Dunnellon, Florida 34431
Over 300 products,
Since 1980
Florida & Vermont

Office Hours: 9AM-4PM Eastern Time (6AM-1PM Pacific Time).
Closed 12Noon-1PM Eastern Time for Lunch.

321-206-1833   Customer Service - Ordering and Order Status
                          Katey Fontaine, VP - Customer Service Director

714-657-3826  Technical Support
                         Norm Lambert, President - Technical Support Director 
352-489-1666   Accounting and Administration
                          Debby Lambert, CEO, and CFO

352-489-1625   Fax line to all Departments

24 hour Hazmat Emergency Telephone Response Service -1-800-633-8253

MasterCard, Visa, and American Express logo

Copyright © 1994-2009 EPOXY.COM a division of Epoxy Systems, Inc. - Florida and Vermont.  All rights reserved.

Unless other wise agreed upon in writing, buyer is responsible for the cost of shipping.

This information is presented in good faith to assist in determining whether this product is suitable for application. No warranty or representation, however, is intended or made, nor is protection from any law or patent to be inferred, and all patent rights reserved.

Epoxy.com a division of Epoxy Systems, Inc.  warrants its products (when properly stored) for the period of time as follows: Epoxies, Product #315, Product #315BC, and Product #316 one (1) year; Polyesters, Methyl Methacrylates (normal) two (2) months and Polyurethanes Four (4) months;  Power Tools and Equipment 90 days; Vinyl Esters, High Molecular Weight  Methacrylates (HMMA) and all other resins (not specifically mentioned above) 30 days; hand tools (non-power tools) 30 days.   Epoxy.com warrants that its products will be free of manufacturing defects and will be in conformity with published specifications when handled, stored, mixed and applied in accordance with recommendations of Epoxy.com. If any product fails to meet this warranty, the liability of Epoxy.com will be limited to replacement of any non-conforming material if notice of such non-conformity is given to Epoxy.com  within the warranty period for the material (as indicated above), or within 1 year of the delivery of materials (whichever is sooner). Epoxy.com may in its discretion refund the price received by Epoxy.com in lieu of replacing the material. No customer, distributor, or representative of Epoxy.com is authorized to change or modify the published specifications of this warranty in any way. No one is authorized to make oral warranties on behalf of Epoxy.com. In order to obtain replacement or refund the customer must provide written notice containing full details of the non-conformity. Epoxy.com reserves the right to inspect the non-conforming material prior to replacement. EXCEPT FOR THE EXPRESSED WARRANTY STATED ABOVE, THERE ARE NO OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING WITHOUT LIMITATION, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR PURPOSE. Epoxy.com 'S OBLIGATION SHALL NOT EXTEND BEYOND THE OBLIGATIONS EXPRESSLY UNDERTAKEN ABOVE AND Epoxy.com  SHALL HAVE NO LIABILITY OR RESPONSIBILITY TO THE PURCHASER OR ANY THIRD PARTY FOR ANY LOSS, COST, EXPENSE, DAMAGE OR LIABILITY, WHETHER DIRECT OR INDIRECT, OR FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES. All quotes and sales subject to availability.

Many of our products are made on an individual order basis.   Unless authorized in writing by Epoxy.com a division of Epoxy Systems, Inc. in writing before the material is made, there are no returns on items purchased from us, once the order has been processed, and the material made. In the event of authorized returns a restocking charge will be charged in the amount of 30% of the value of the material returned or $150 whichever is greater.  No returns on non-list priced items.  All Returns are for merchandise (store) credit only, no cash or credit card credits.  In the event of a return, buyer is responsible for the cost of shipping and handling in both directions.


[Home] [Catalog of Products] [Where to Start] [[Bonding Systems] [Chip Floors] [Chemical Resistance]
[Coatings] [Conductive] [Applications] [Elastomeric Systems] [High Temperature]
[Industrial Floors] [Injection] [Joint Systems & Sealants] [Mortars / Grouts] [Novolac] [Polymer Systems]
[Primers and Sealers] [Misc.] [Seamless Flooring] [Waterproofing] [Dealers Wanted] [Installation Tips]
[Product Guide] [Wood Filler] [Who We Are] [Guide Specs]
[Tech Data Sheets in Acrobat Format ] [MSDS in Acrobat Format] [Online Ordering Authorization Form]

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