Hardness Hardness |
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Material Material |
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Color Color |
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![]() | Off-White | ![]() | Light Pink |
![]() | Tan | ![]() | White |
REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Prototyping Foam

Use this urethane foam for a variety of prototyping applications.
Off-white foam can be carved with woodcarving tools and bonded with epoxy, super glue, contact cement, or polyurethane and acrylic adhesives.
Light-pink foam is also known as butterboard. It has a finer cell structure than the off-white foam, so it can handle more detailed work. It can be carved, milled, and sanded.
Tolerance Range | ||||||||||
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Thick. | Wd. | Lg. | Density, lbs./cu. ft. | Hardness | Thick. | Wd. | Lg. | Softening Temperature, °F | Each | |
Off-White | ||||||||||
1" | 24" | 48" | 6 | Durometer 8D | -0.003" to 0.003" | 0" to 1/4" | 0" to 1/2" | 245° | 0000000 | 000000 |
1" | 24" | 48" | 10 | Durometer 16D | -0.003" to 0.003" | 0" to 1/4" | 0" to 1/2" | 245° | 0000000 | 00000 |
1" | 24" | 48" | 20 | Durometer 36D | -0.003" to 0.003" | 0" to 1/4" | 0" to 1/2" | 245° | 0000000 | 000000 |
2" | 24" | 48" | 6 | Durometer 8D | -0.003" to 0.003" | 0" to 1/4" | 0" to 1/2" | 245° | 0000000 | 000000 |
2" | 24" | 48" | 10 | Durometer 16D | -0.003" to 0.003" | 0" to 1/4" | 0" to 1/2" | 245° | 0000000 | 000000 |
2" | 24" | 48" | 20 | Durometer 36D | -0.006" to 0.006" | 0" to 1/4" | 0" to 1/2" | 245° | 0000000 | 000000 |
3" | 24" | 48" | 6 | Durometer 8D | -0.003" to 0.003" | 0" to 1/4" | 0" to 1/2" | 245° | 0000000 | 000000 |
3" | 24" | 48" | 10 | Durometer 16D | -0.003" to 0.003" | 0" to 1/4" | 0" to 1/2" | 245° | 0000000 | 000000 |
3" | 24" | 48" | 20 | Durometer 36D | -0.006" to 0.006" | 0" to 1/4" | 0" to 1/2" | 245° | 0000000 | 000000 |
4" | 24" | 48" | 6 | Durometer 8D | -0.003" to 0.003" | 0" to 1/4" | 0" to 1/2" | 245° | 0000000 | 000000 |
4" | 24" | 48" | 10 | Durometer 16D | -0.003" to 0.003" | 0" to 1/4" | 0" to 1/2" | 245° | 0000000 | 000000 |
4" | 24" | 48" | 20 | Durometer 36D | -0.006" to 0.006" | 0" to 1/4" | 0" to 1/2" | 245° | 0000000 | 000000 |
Light Pink | ||||||||||
2" | 6" | 12" | 48 | Durometer 63D | 0" to 1/8" | 0" to 1/4" | __ | 245° | 0000000 | 000000 |
2" | 12" | 12" | 48 | Durometer 63D | 0" to 1/8" | 0" to 1/4" | __ | 245° | 00000000 | 000000 |
2" | 12" | 24" | 48 | Durometer 63D | 0" to 1/8" | 0" to 1/4" | __ | 245° | 00000000 | 000000 |
2" | 24" | 24" | 48 | Durometer 63D | 0" to 1/8" | 0" to 1/4" | __ | 245° | 00000000 | 000000 |
3" | 6" | 12" | 48 | Durometer 63D | 0" to 1/8" | 0" to 1/4" | __ | 245° | 0000000 | 000000 |
3" | 12" | 12" | 48 | Durometer 63D | 0" to 1/8" | 0" to 1/4" | __ | 245° | 00000000 | 000000 |
3" | 12" | 24" | 48 | Durometer 63D | 0" to 1/8" | 0" to 1/4" | __ | 245° | 00000000 | 000000 |
3" | 24" | 24" | 48 | Durometer 63D | 0" to 1/8" | 0" to 1/4" | __ | 245° | 00000000 | 00000000 |
4" | 6" | 12" | 48 | Durometer 63D | 0" to 1/8" | 0" to 1/4" | __ | 245° | 0000000 | 000000 |
4" | 12" | 12" | 48 | Durometer 63D | 0" to 1/8" | 0" to 1/4" | __ | 245° | 00000000 | 000000 |
4" | 12" | 24" | 48 | Durometer 63D | 0" to 1/8" | 0" to 1/4" | __ | 245° | 00000000 | 000000 |
4" | 24" | 24" | 48 | Durometer 63D | 0" to 1/8" | 0" to 1/4" | __ | 245° | 00000000 | 00000000 |
6" | 6" | 12" | 48 | Durometer 63D | 0" to 1/8" | 0" to 1/4" | __ | 245° | 0000000 | 000000 |
6" | 12" | 12" | 48 | Durometer 63D | 0" to 1/8" | 0" to 1/4" | __ | 245° | 00000000 | 000000 |
6" | 12" | 24" | 48 | Durometer 63D | 0" to 1/8" | 0" to 1/4" | __ | 245° | 00000000 | 00000000 |
6" | 24" | 24" | 48 | Durometer 63D | 0" to 1/8" | 0" to 1/4" | __ | 245° | 00000000 | 00000000 |
Foam Casting Compounds


expands to fill every
hole and cavity.


Mix these two-part foam casting compounds and pour into your mold—they expand to fill every hole and cavity. Because they're foam, they're lighter weight than other casting compounds.
The foam's expansion is related to its density. Denser foam expands less; lighter foam expands more.
Before casting, apply petroleum jelly (not included) to prevent the part from sticking, stretching, and tearing. It won't cause the foam to collapse as it cures. Because it leaves a residue, parts should be cleaned before painting or coating.
Flexible compounds cure into soft foam; use them to cast gaskets, cushions, and other bendable objects. The foam is open cell, which means it will absorb water, air, and gases.
Rigid compounds form stiff, closed-cell foam, which prevents water and air from flowing through the part. Machinable, they’re dense enough to create prototype modeling blocks, so you can make mockups and test out tooling setups with little cost and less wear on your tools.
Foam Expansion | Density, lbs./cu. ft. | Time to Harden | Time to Cure | Time to Demold | Cure Temperature, °F | Max. Temperature, °F | Shrinkage | Color | Mixing Required | Weight, lbs. | Each | |
Polyurethane Foam | ||||||||||||
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Flexible | ||||||||||||
15 times | 4 | 3 min. | 25 min. | 25 min. | 80° | 125° | Not Rated | White | Yes | 3 | 00000000 | 000000 |
Rigid—Machinable | ||||||||||||
2 times | 20 | 3 min. | 15 min. | 15 min. | 75° | 85° | Not Rated | Tan | Yes | 16 | 0000000 | 000000 |