Liquid Plastics | McMaster-Carr

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18 Products

Mold-Your-Own Hand Grips

Place these plastic pellets in hot water until they soften and become pliable. While still warm, mold the material directly to your handle to create a custom grip—it can be cut with scissors if necessary. Grips become rigid when they cool. To remove or reuse the grips, reheat the material.

	Container Type	Wt., lb.		Each
Plastic







	Smooth

	155 to 180	Yes	White	Jar	1	0000000	000000

Protective Coatings

Used to insulate, create grips, and color-code components, these coatings resist high temperatures, light abrasion, and corrosion.

PVC—Can

PVC coatings can be used on nearly any surface, including rubber. They withstand salt, acids, alkalies, and gasoline. They also resist UV light, so they won’t lose their color when exposed to sunlight over long periods of time.

Coatings in a can can be dipped, brushed, or sprayed.

		Dry Time
Container Size, gal.	Solution Type	Touch, min.	Overall, hr.	Approx. Coverage @ Thk.	Mixing Req.	Max. Temp., ° F	Application Temp. Range, ° F	For Use Outdoors	For Use On	Color		Each



	1	Solvent Based	30	24	60 ft² @ 5 mil	No	200	65 to 80	Yes	Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Galvanized Iron, Galvanized Steel, Plastic, Rubber, Fiberglass, Ceramic, Glass, Masonry, Concrete, Stone, Asphalt, Drywall, Wood	Semi-Gloss Black	00000000	0000000


	1	Solvent Based	30	24	60 ft² @ 5 mil	No	200	65 to 80	Yes	Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Galvanized Iron, Galvanized Steel, Plastic, Rubber, Fiberglass, Ceramic, Glass, Masonry, Concrete, Stone, Asphalt, Drywall, Wood	Semi-Gloss Red	00000000	000000
	1	Solvent Based	30	24	60 ft² @ 5 mil	No	200	65 to 80	Yes	Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Galvanized Iron, Galvanized Steel, Plastic, Rubber, Fiberglass, Ceramic, Glass, Masonry, Concrete, Stone, Asphalt, Drywall, Wood	Semi-Gloss Yellow	00000000	000000

Quick-Set Casting Compounds

Create detailed rubber shapes that are ready to use in fifteen minutes or less. Unlike traditional casting compounds, which can take up to 24 hours to set, these compounds harden after two minutes, and can be removed from molds within fifteen. Use them to make your own prototypes, molds, and linings.

Casting Compounds

Acrylic Plastic

69° F Cure Temperature—Combine acrylic plastic or silicone rubber with a 69° cure temperature compounds in different ratios to adjust the consistency from thin to thick. Thin mixtures are easier to pour and better for filling small crevices.

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







	Hard

	Durometer 85D	2	11	11	69	350	0%	Light Blue	Yes	20	1	0000000	0000000


	Durometer 85D	2	11	11	69	350	0%	Light Blue	Yes	62	3	0000000	000000

High-Temperature Casting Compounds

Capture intricate details when creating prototypes, molds, and linings with these easy-to-mix compounds.

View our selection of release agents.

Silicon Carbide—Silicon carbide has a high heat transfer rate, making it ideal for use in metal casting molds. It has the added benefit of excellent erosion and oxidation resistance.

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



	20	24	24	77	2,700	1.5%	Black	Yes	119	10	0000000	0000000

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	00000000	000000


		4X	12	3	25	25	80	125	Not Rated	White	Yes	12	0000000	000000
		8X	8	3	25	25	80	125	Not Rated	White	Yes	3	00000000	00000
		8X	8	3	25	25	80	125	Not Rated	White	Yes	12	0000000	000000
		15X	4	3	25	25	80	125	Not Rated	White	Yes	3	00000000	00000
		15X	4	3	25	25	80	125	Not Rated	White	Yes	12	0000000	000000


		Beige

				Rigid—Machinable

				2X	20	3	15	15	75	85	Not Rated	Beige	Yes	16	0000000	000000


				7X	12	3	15	15	75	85	Not Rated	Beige	Yes	4	00000000	00000
				7X	12	3	15	15	75	85	Not Rated	Beige	Yes	16	0000000	000000
				19X	4	3	15	15	75	85	Not Rated	Beige	Yes	4	00000000	00000
				19X	4	3	15	15	75	85	Not Rated	Beige	Yes	16	0000000	000000