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Polyurethane Foam and Resin
by Special Effect Supply


Polyurethane Foam

Rigid Foam Two Pound Density
Polyurethane foam, 2 lb density. Also known as A-B foam. Mix two equal parts of Part A and Part B and compound will expand about 25 times to form a rigid mass of foam. Not the same as the spray foam you get at the hardware store. Doesn't form a consistent skin and not especially strong. Great for foam fill for watercraft. Water blown. A 12" x 12" x 12" block of this stuff will weigh about two pounds. A kit consists of two equal volumes of material. For example, a quart kit will contain one quart of part A and one quart of part B.

CAT # Description Price Add
RF2-16x2 Rigid Foam, 2#, 2 pints Kit *S*
RF2-32x2 Rigid Foam, 2#, 2 quarts Kit *S*
RF2-128x2 Rigid Foam, 2#, 2 gallons Kit *S*
Rigid Foam

Three Pound Density
Polyurethane foam, 3 lb density. Also known as A-B foam. Mix two equal parts of Part A and Part B and compound will expand about 20 times to form a rigid mass of foam. Not the same as the spray foam you get at the hardware store. Doesn't form a consistent skin. Stronger than the 2 pound stuff. Great for making foam armatures on which to sculpt. Water blown. A 12" x 12" x 12" block of this stuff will weigh about three pounds. A kit consists of two equal volumes of material. For example, a quart kit will contain one quart of part A and one quart of part B. Doesn't expand as much as the two pound kits so the material won't go as far.

CAT # Description Price Add
RF3-16x2 Rigid Foam, 3#, 2 pints Kit *S*
RF3-32x2 Rigid Foam, 3#, 2 quarts Kit *S*
RF3-128x2 Rigid Foam, 3#, 2 gallons Kit *S*

Price List   Rigid Foam MSDS Sheet
Soft Polyurethane Foam
Polyurethane foam, about 3 1/2 lb density under ideal conditions. Also known as soft foam. Mix proportionate parts of Part A and Part B and compound will expand to form a soft mass of foam. The same kind of foam that you would find in a couch cushion. Forms a fair skin, great for filling masks, stunt props or body parts for display. Water blown. A 12" x 12" x 12" block of this stuff will weigh about three and 1/2 pounds. A kit consists of two unequal volumes of material. For example, a quart kit will contain one quart of Part B and about half of much of Part A. Rough mixing ratio is 63 parts of Part B to 37 parts of Part A. This is not a one to one mixture. An accurate gram scale is required.
CAT # Description Price Add
SF3-25 Soft Foam, 3.3#. 25 fl. oz. Kit *S*
SF3-50 Soft Foam, 3.3#. 50 fl. oz. Kit *S*
SF3-200 Soft Foam, 3.3#. 200 fl. oz. Kit *S*

Price List   Soft Polyurethane Foam MSDS Sheet
Polyurethane Resin

Odorless Casting Resin or Plastic Casting Resin. Not completely odorless but is called that anyway. Mix two equal parts of Part A and Part B and compound will form a solid plastic in a few minutes. Great for artists who want to reproduce their own "Resin Kits." Works great in a silicone mold. Color is sort of a amberish, translucent white. Can be painted, but don't use a silicone mold release.

CAT # Description Price Add
PCRW-16x2 Casting Resin, 2 pints Kit *S*
PCRW-32x2 Casting Resin, 2 quarts Kit *S*
PCRW-128x2 Casting Resin, 2 gallons Kit *S*

Price List   Casting Resin MSDS Sheet
About Foam Amounts

Basically if you take a block of foam that is 12 inches by 12 inches by 12 includes and set it on a scale the foam will weight the density specified. Three pound foam would weigh three pounds, the two pound foam would weigh two pounds, etc..

For rigid foams the basic gallons kit weighs about 17 lbs.

Therefore the yields for the rigid foam kits are:

RF2-16x2 = 1 cubic feet
RF2-32x2 = 2.1 cubic feet
RF2-128x2 = 8.5 cubic feet

RF3-16x2 = .7 cubic feet
RF3-32x2 = 1.4 cubic feet
RF3-128x2= 5.6 cubic feet

Soft foam is a different matter. The kits are not equal amounts. Usually the part B is about 60% of the mix and part A is 40% of the mix. When we specify a gallon kit it means the side B will be a full gallon and the side A will be what is required for its 40%. Usually the density is about 3.25 lbs. per cubic foot.

Here are the yields for the Soft Foam kits;

SF3-200 = 4.8 cubic feet
SF3-50 =  1.2 cubic feet
SF3-25 = .6 cubic feet

These are rough calculations based on perfect conditions. Expansion rates are affected by product temperature, mold temperature, humidity and accuracy of the mix.

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