Urethane Casting Compounds

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	Material Material

Aluminum-Filled Urethane

Foam

Rubber

	Hardness Hardness

	Hardness Rating Hardness Rating

	Color Color

	Black		White
	Yellow		Gray
	Blue- Green		Tan
	Clear

	Shrinkage Shrinkage

0.5%

1.5%

Not Rated

	Time to Cure Time to Cure

	Weight Weight

	Time to Harden Time to Harden

	Volume Volume

250 cu. in. or greater

	Maximum Temperature Maximum Temperature

Less than 250° F

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Time to Demold Time to Demold

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	Mixing Required Mixing Required

Yes

	Cure Temperature Cure Temperature

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Clarity Clarity

Clear

	Cell Type Cell Type


Open	Closed

	Density Density

	Flexibility Flexibility

Flexible

Rigid

	Specifications Met Specifications Met

FDA Compliant 21 CFR
175.105

FDA Compliant 21 CFR
177.1680

	Machinable Machinable

Yes

	Foam Expansion Foam Expansion

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45 Products

Casting Compounds

Capture intricate details when creating prototypes, molds, and linings with these easy-to-mix two-part compounds. This urethane is water and abrasion resistant.

View our selection of release agents. View additional information about the hardness of these materials.

Urethane
Hardness	Time to Harden	Time to Cure	Time to Demold	Cure Temperature, °F	Max. Temperature, °F	Shrinkage	Color	Mixing Required	Volume, cu. in.	Weight, lbs.		Each
Soft
Durometer 20A	15 min.	168 hrs.	5 hrs.	77°	180°	1.5%	Black	Yes	25	1	0000000	000000
Durometer 20A	15 min.	168 hrs.	5 hrs.	77°	180°	1.5%	Black	Yes	250	10	0000000	000000
Firm
Durometer 40A	15 min.	168 hrs.	5 hrs.	77°	180°	1.5%	Black	Yes	25	1	0000000	00000
Durometer 40A	15 min.	168 hrs.	5 hrs.	77°	180°	1.5%	Black	Yes	250	10	0000000	000000
Durometer 60A	15 min.	168 hrs.	2 hrs.	77°	180°	0.5%	Black	Yes	25	1	0000000	00000
Durometer 60A	15 min.	168 hrs.	2 hrs.	77°	180°	0.5%	Black	Yes	250	10	0000000	000000
Hard
Durometer 80A	15 min.	168 hrs.	3 hrs.	77°	180°	1.5%	Black	Yes	6	1/4	0000000	00000
Durometer 80A	15 min.	168 hrs.	3 hrs.	77°	180°	1.5%	Black	Yes	25	1	0000000	00000
Durometer 80A	15 min.	168 hrs.	3 hrs.	77°	180°	1.5%	Black	Yes	250	10	0000000	000000
Durometer 94A	15 min.	168 hrs.	2 hrs.	77°	180°	1.5%	Black	Yes	25	1	0000000	00000
Durometer 94A	15 min.	168 hrs.	2 hrs.	77°	180°	1.5%	Black	Yes	250	10	0000000	000000
Durometer 60D	15 min.	168 hrs.	2 hrs.	77°	180°	1.5%	Black	Yes	25	1	0000000	00000
Durometer 60D	15 min.	168 hrs.	2 hrs.	77°	180°	1.5%	Black	Yes	250	10	0000000	000000
Durometer 85D	5 min.	2 hrs.	1.5 hrs.	77°	180°	1.5%	Blue-Green	Yes	80	5	000000	00000
Durometer 85D	5 min.	2 hrs.	1.5 hrs.	77°	180°	1.5%	Blue-Green	Yes	320	20	000000	000000

Machinable Casting Compounds

After these compounds cure, they're tough enough to be machined. They are easy-to-mix two-part compounds that capture intricate details when creating prototypes, molds, and linings.

View our selection of release agents. View additional information about the hardness of these materials.

Aluminum-Filled Urethane
Hardness	Time to Harden	Time to Cure	Time to Demold	Cure Temperature, °F	Max. Temperature, °F	Shrinkage	Color	Mixing Required	Volume, cu. in.	Weight, lbs.		Each
Hard
Durometer 83D	6 min.	18 hrs.	2 hrs.	75°	175°	1.5%	Gray	Yes	83	5	00000000	0000000
Durometer 83D	6 min.	18 hrs.	2 hrs.	75°	175°	1.5%	Gray	Yes	334	20	00000000	000000

See-Through Casting Compounds

Create transparent molds to monitor fill levels, differentiate parts at a glance, and avoid damaging parts when cutting the mold away. These casting compounds are two parts that activate when mixed.

Urethane compounds create hard molds, which are good for delicate and intricate shapes because the small contours won't deform or collapse when the material is poured in. Although not required, curing urethane molds inside a vacuum chamber improves their clarity. By removing trapped air bubbles, the chamber prevents the finished mold from looking speckled.View our selection of release agents. View additional information about the hardness of these materials.

Urethane
Hardness	Time to Harden	Time to Cure	Time to Demold	Max. Temperature, °F	Shrinkage	Color	Mixing Required	Volume, cu. in.	Weight, lbs.		Each
Hard
Durometer 80A	6 min.	144 hrs. @ 77° F	2 hrs. @ 77° F	180°	5%	Clear	Yes	25	1	0000000	000000
Durometer 75D	6 min.	144 hrs. @ 77° F	2 hrs. @ 77° F	180°	5%	Clear	Yes	25	1	0000000	00000

Easy-to-Work Casting Compounds

Combine the liquid components to form a putty that can be molded into or around any shape. Use these compounds to capture intricate details when creating prototypes, molds, and linings.

View our selection of release agents. View additional information about the hardness of these materials.

Urethane
Hardness	Time to Harden	Time to Cure	Time to Demold	Cure Temperature, °F	Max. Temperature, °F	Shrinkage	Color	Mixing Required	Volume, cu. in.	Weight, lbs.		Each
Firm
Durometer 60A	15 min.	168 hrs.	3 hrs.	75°	180°	1.5%	Black	Yes	25	1	0000000	000000
Durometer 60A	15 min.	168 hrs.	3 hrs.	75°	180°	1.5%	Black	Yes	100	4	0000000	000000
Hard
Durometer 85A	15 min.	168 hrs.	3 hrs.	75°	180°	1.5%	Black	Yes	25	1	0000000	00000
Durometer 85A	15 min.	168 hrs.	3 hrs.	75°	180°	1.5%	Black	Yes	100	4	0000000	000000

Fine-Detail Casting Compounds

Replicate even the most complex details when creating prototypes, molds, and linings. This easy-to-mix two-part compound flows smoothly into crevices.

View our selection of release agents. View additional information about the hardness of these materials.

Urethane
Hardness	Time to Harden	Time to Cure	Time to Demold	Cure Temperature, °F	Max. Temperature, °F	Shrinkage	Color	Mixing Required	Volume, cu. in.	Weight, lbs.		Each
Hard
Durometer 83D	8 min.	168 hrs.	2 hrs.	75°	135°	1.5%	White	Yes	94	3.6	00000000	000000
Durometer 83D	8 min.	168 hrs.	2 hrs.	75°	135°	1.5%	White	Yes	374	14.4	00000000	000000

Long-Life Casting Compounds

Create rubber molds that retain their shape for decades—they won’t soften, degrade, or warp, so you can continue to replicate intricate parts. Because these compounds don’t shrink as they cure, they are more accurate and predictable than other compounds.

View our selection of release agents. View additional information about the hardness of these materials.

Urethane
Hardness	Time to Harden	Time to Cure	Time to Demold	Cure Temperature, °F	Max. Temperature, °F	Shrinkage	Color	Mixing Required	Volume, cu. in.	Weight, lbs.		Each
Firm
Durometer 45A	60 min.	24 hrs.	16 hrs.	77°	200°	0%	Yellow	Yes	58	2.2	0000000	0000000

Food Industry Casting Compounds

These food-grade compounds comply with FDA 21 CFR. They are easy-to-mix two-part compounds that capture intricate details when creating prototypes, molds, and linings.

View our selection of release agents. View additional information about the hardness of these materials.

Urethane
Hardness	Time to Harden	Time to Cure	Time to Demold	Cure Temperature, °F	Max. Temperature, °F	Shrinkage	Color	Mixing Required	Specifications Met	Volume, cu. in.	Weight, lbs.		Each
Firm
Durometer 60A	8 min.	12 hrs.	2 hrs.	120°	180°	5%	White	Yes	FDA Compliant 21 CFR 175.105, FDA Compliant 21 CFR 177.1680	25	1	0000000	000000
Durometer 60A	8 min.	12 hrs.	2 hrs.	120°	180°	5%	White	Yes	FDA Compliant 21 CFR 175.105, FDA Compliant 21 CFR 177.1680	250	10	0000000	000000
Hard
Durometer 78A	4 min.	12 hrs.	2 hrs.	120°	180°	5%	White	Yes	FDA Compliant 21 CFR 175.105, FDA Compliant 21 CFR 177.1680	25	1	0000000	00000
Durometer 78A	4 min.	12 hrs.	2 hrs.	120°	180°	5%	White	Yes	FDA Compliant 21 CFR 175.105, FDA Compliant 21 CFR 177.1680	250	10	0000000	000000
Durometer 88A	4 min.	12 hrs.	2 hrs.	120°	180°	5%	White	Yes	FDA Compliant 21 CFR 175.105, FDA Compliant 21 CFR 177.1680	25	1	0000000	00000
Durometer 88A	4 min.	12 hrs.	2 hrs.	120°	180°	5%	White	Yes	FDA Compliant 21 CFR 175.105, FDA Compliant 21 CFR 177.1680	250	10	0000000	000000
Durometer 75D	5 min.	12 hrs.	2 hrs.	120°	180°	5%	White	Yes	FDA Compliant 21 CFR 175.105, FDA Compliant 21 CFR 177.1680	25	1	0000000	00000
Durometer 75D	5 min.	12 hrs.	2 hrs.	120°	180°	5%	White	Yes	FDA Compliant 21 CFR 175.105, FDA Compliant 21 CFR 177.1680	250	10	0000000	000000

Foam Casting Compounds

Step 1. Pour compound into your mold.

Step 2. Compound
expands to fill every
hole and cavity.

Create lightweight molds with these two-part compounds. They expand as foam after they’re poured to fill every cavity. The denser the foam, the less it will expand. Before casting, apply petroleum jelly (not included) to prevent sticking, stretching, and tearing. It won't cause the foam to collapse as it cures.

Flexible compounds cure into soft, open-cell foam, which absorbs water, air, and gases. They are often used to cast gaskets, cushions, and other bendable objects.

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 test setups without wearing down tools.

Polyurethane Foam
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
Flexible
4 times	12	3 min.	25 min.	25 min.	80°	125°	Not Rated	White	Yes	12	0000000	0000000
4 times	12	3 min.	25 min.	25 min.	80°	125°	Not Rated	White	Yes	3	00000000	00000
8 times	8	3 min.	25 min.	25 min.	80°	125°	Not Rated	White	Yes	12	0000000	000000
8 times	8	3 min.	25 min.	25 min.	80°	125°	Not Rated	White	Yes	3	00000000	00000
15 times	4	3 min.	25 min.	25 min.	80°	125°	Not Rated	White	Yes	12	0000000	000000
15 times	4	3 min.	25 min.	25 min.	80°	125°	Not Rated	White	Yes	3	00000000	00000
Rigid—Machinable
2 times	20	3 min.	15 min.	15 min.	75°	85°	Not Rated	Tan	Yes	16	0000000	000000
7 times	12	3 min.	15 min.	15 min.	75°	85°	Not Rated	Tan	Yes	16	0000000	000000
7 times	12	3 min.	15 min.	15 min.	75°	85°	Not Rated	Tan	Yes	4	00000000	00000
19 times	4	3 min.	15 min.	15 min.	75°	85°	Not Rated	Tan	Yes	16	0000000	000000
19 times	4	3 min.	15 min.	15 min.	75°	85°	Not Rated	Tan	Yes	4	00000000	00000