Polyurethane Casting Compounds

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Material

Hardness

Color

Hardness Rating

Cell Type

Weight

Performance

Flexibility

Shrinkage

Time to Harden

Time to Cure

Volume

25 cu. in. to 49.9 cu. in.

50 cu. in. to 99.9 cu. in.

100 cu. in. to 249.9 cu. in.

250 cu. in. or greater

Maximum Temperature

Time to Demold

Cure Temperature

Mixing Required

REACH

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

Exempt

RoHS

Compliant

Food Industry Standard

FDA Compliant 21 CFR 175.105

FDA Compliant 21 CFR 177.1680

Density

Clarity

Environment

Foam Expansion

Machinable

50 Products

Casting Compounds

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

View our selection of release agents.

	Time to Demold, hr.	Cure Temp., ° F	Max. Temp., ° F	Shrinkage	Color	Mixing Req.	Volume, cu. in.	Wt., lb.		Each
Urethane Rubber





	Soft

	Durometer 20A	15	168	5	77	180	0.1%	Black	Yes	25	1	8644K51	000000
	Durometer 20A	15	168	5	77	180	0.1%	Black	Yes	250	10	8644K52	000000




			Hard

			Durometer 40A	15	168	5	77	180	0.1%	Black	Yes	25	1	8644K53	00000
			Durometer 40A	15	168	5	77	180	0.1%	Black	Yes	250	10	8644K54	000000
			Durometer 60A	15	168	2	77	180	0.1%	Black	Yes	25	1	8644K24	00000
			Durometer 60A	15	168	2	77	180	0.1%	Black	Yes	250	10	8644K26	000000
			Durometer 80A	15	168	3	77	180	0.1%	Black	Yes	6	0.25	8644K57	00000
			Durometer 80A	15	168	3	77	180	0.1%	Black	Yes	25	1	8644K11	00000
			Durometer 80A	15	168	3	77	180	0.1%	Black	Yes	250	10	8644K12	000000
			Durometer 94A	15	168	2	77	180	0.1%	Black	Yes	25	1	8644K18	00000
			Durometer 94A	15	168	2	77	180	0.1%	Black	Yes	250	10	8644K19	000000
			Durometer 60D	15	168	2	77	180	0.1%	Black	Yes	25	1	8644K55	00000


			Durometer 60D	15	168	2	77	180	0.1%	Black	Yes	250	10	8644K56	000000
			Durometer 75D	15	168	2	77	180	0.1%	Black	Yes	25	1	8690K311	00000
			Durometer 75D	15	168	2	77	180	0.1%	Black	Yes	250	10	8690K312	000000
			Durometer 85D	5	2	1.5	77	180	0.1%	Green	Yes	80	5	8690K1	00000
			Durometer 85D	5	2	1.5	77	180	0.1%	Green	Yes	320	20	8690K2	000000

Food and Beverage 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.

	Time to Demold, hr.	Cure Temp., ° F	Max. Temp., ° F	Shrinkage	Color	Mixing Req.	Food Industry Std.	Volume, cu. in.	Wt., lb.		Each
Urethane Rubber





	Hard

	Durometer 40A	8	12	2	120	180	5%	White	Yes	FDA Compliant 21 CFR 175.105, FDA Compliant 21 CFR 177.1680	25	1	8644K71	000000
	Durometer 60A	8	12	2	120	180	5%	White	Yes	FDA Compliant 21 CFR 175.105, FDA Compliant 21 CFR 177.1680	25	1	8644K34	00000
	Durometer 60A	8	12	2	120	180	5%	White	Yes	FDA Compliant 21 CFR 175.105, FDA Compliant 21 CFR 177.1680	250	10	8644K33	000000
	Durometer 78A	4	12	2	120	180	5%	White	Yes	FDA Compliant 21 CFR 175.105, FDA Compliant 21 CFR 177.1680	25	1	8644K37	00000
	Durometer 88A	4	12	2	120	180	5%	White	Yes	FDA Compliant 21 CFR 175.105, FDA Compliant 21 CFR 177.1680	25	1	8644K41	00000
	Durometer 88A	4	12	2	120	180	5%	White	Yes	FDA Compliant 21 CFR 175.105, FDA Compliant 21 CFR 177.1680	250	10	8644K43	000000
	Durometer 75D	5	12	2	120	180	5%	White	Yes	FDA Compliant 21 CFR 175.105, FDA Compliant 21 CFR 177.1680	25	1	8644K47	00000

Foam Casting Compounds


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—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—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.

	Density, lb/ft³	Time to Cure, min.	Time to Demold, min.	Cure Temp., ° F	Max. Temp., ° F	Shrinkage	Color	Mixing Req.	Wt., lb.		Each
Polyurethane Foam



	White

		Flexible—Not Machinable

		4X	12	3	25	25	80	125	Not Rated	White	Yes	3	8866N206	000000
		4X	12	3	25	25	80	125	Not Rated	White	Yes	12	8866N26	000000
		8X	8	3	25	25	80	125	Not Rated	White	Yes	3	8866N205	00000
		8X	8	3	25	25	80	125	Not Rated	White	Yes	12	8866N25	000000
		15X	4	3	25	25	80	125	Not Rated	White	Yes	3	8866N204	00000
		15X	4	3	25	25	80	125	Not Rated	White	Yes	12	8866N24	000000


		Beige

				Rigid—Machinable

				2X	20	3	15	15	75	85	Not Rated	Beige	Yes	16	8866N23	000000
				7X	12	3	15	15	75	85	Not Rated	Beige	Yes	4	8866N202	00000
				7X	12	3	15	15	75	85	Not Rated	Beige	Yes	16	8866N22	000000
				19X	4	3	15	15	75	85	Not Rated	Beige	Yes	4	8866N201	00000
				19X	4	3	15	15	75	85	Not Rated	Beige	Yes	16	8866N21	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.

View our selection of release agents.

Urethane Rubber—Urethane rubber compounds are tougher than silicone rubber compounds, so your molds will last longer. Although not required, curing urethane rubber molds inside a vacuum chamber improves their clarity. By removing trapped air bubbles, the chamber prevents the finished mold from looking speckled.

	Time to Demold	Cure Temp.	Max. Temp., ° F	Shrinkage	Color	Mixing Req.	Volume, cu. in.	Wt., lb.		Each
Urethane Rubber





	Hard

	Durometer 40A	6	144 hr.	2 hr.	77° F	180	0.8%	Clear	Yes	25	1	4431N101	000000
	Durometer 60A	6	144 hr.	2 hr.	77° F	180	0.8%	Clear	Yes	25	1	4431N102	00000
	Durometer 80A	6	144 hr.	2 hr.	77° F	180	0.8%	Clear	Yes	25	1	8644K59	00000
	Durometer 75D	6	144 hr.	2 hr.	77° F	180	0.8%	Clear	Yes	25	1	8644K58	00000

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.

	Time to Demold, hr.	Cure Temp., ° F	Max. Temp., ° F	Shrinkage	Color	Mixing Req.	Volume, cu. in.	Wt., lb.		Each
Urethane Rubber





	Hard

	Durometer 45A	60	24	16	77	200	0%	Yellow	Yes	58	2.2	4353N11	0000000

Easy-Form 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.

	Time to Demold, hr.	Cure Temp., ° F	Max. Temp., ° F	Shrinkage	Color	Mixing Req.	Volume, cu. in.	Wt., lb.		Each
Urethane Rubber





	Hard

	Durometer 60A	15	168	3	75	180	Not Rated	Dark Gray	Yes	25	1	8644K28	000000
	Durometer 60A	15	168	3	75	180	Not Rated	Dark Gray	Yes	100	4	8644K29	000000
	Durometer 85A	15	168	3	75	180	Not Rated	Black	Yes	25	1	8644K13	00000
	Durometer 85A	15	168	3	75	180	Not Rated	Black	Yes	100	4	8644K15	000000
	Durometer 60D	15	168	3	75	180	Not Rated	Dark Gray	Yes	25	1	4423N101	00000
	Durometer 60D	15	168	3	75	180	Not Rated	Dark Gray	Yes	100	4	4423N104	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. Cast up to _1/2" in thickness at a time.

View our selection of release agents.

	Time to Demold, hr.	Cure Temp., ° F	Max. Temp., ° F	Shrinkage	Color	Mixing Req.	Volume, cu. in.	Wt., lb.		Each
Urethane Rubber





	Hard

	Durometer 80D	20	168	4	72	134	0.3%	White	Yes	49	2	87075K6	000000
	Durometer 80D	20	168	4	72	134	0.3%	White	Yes	395	16	87075K61	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.

	Time to Demold, min.	Cure Temp., ° F	Max. Temp., ° F	Shrinkage	Color	Mixing Req.	Volume, cu. in.	Wt., lb.		Each
Aluminum-Filled Urethane





	Hard

	Durometer 84D	6	168	90	72	130	1.5%	Gray	Yes	72 1/2	5	87155K54	0000000
	Durometer 84D	6	168	90	72	130	1.5%	Gray	Yes	290	20	87155K56	000000