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CASTING COMPOUND	A:B MIX RATIO	POT LIFE (MIN.)	DEMOLD TIME +	ULTIMATE SHORE HARDNESS	TENSILE STRENGTH (PSI)	COMPRESSIVE STRENGTH (PSI)	COLOR	HOW MUCH DO I NEED?	BUY ONLINE
URETHANES
Smooth-Cast 45D	1:1 by volume	5	20 min.	45D	1500	N/A	Amber
Smooth-Cast 60D	1:1 by volume	5	20 min.	60D	2200	N/A	Amber
Smooth-Cast 61D	1:1 by volume	7	60 min.	61D	1800	N/A	Amber
Smooth-Cast 300	1:1 by volume	3	10 min.	70D	3000	4500	White
Smooth-Cast 305	1:1 by volume	7	30 min.	70D	3000	4500	White
Smooth-Cast 310	1:1 by volume	20	2-4 hours	70D	2600	4500	White
Smooth-Cast ROTO	1:1 by volume	2.5	10 min.	70D	2400	n/a	White
Smooth-Cast 320	1:1 by volume	3	10 min.	70D	3100	4500	Off-White
Smooth-Cast 321	1:1 by volume	7	30 min.	70D	3100	4500	Off-White
Smooth-Cast 322	1:1 by volume	20	4 hrs.	70D	3100	4500	Off-White
Smooth-Cast 325 Colormatch™	1:1 by volume	3	10 min.	72D	3170	4500	Clear Amber
Smooth-Cast 326 Colormatch™	1:1 by volume	7	60 min.	72D	3170	4500	Clear Amber
Smooth-Cast 327 Colormatch™	1:1 by volume	20	2-4 hrs.	72D	3170	4500	Clear Amber
CASTING COMPOUND	A:B MIX RATIO	POT LIFE (MIN.)	DEMOLD TIME +	ULTIMATE SHORE HARDNESS	TENSILE STRENGTH (PSI)	COMPRESSIVE STRENGTH (PSI)	COLOR		BUY ONLINE
Smooth-Cast 385	1:5 by weight	20	2 hours	85D	3100	8500	Off- White
C-1508	26:100 by weight	20	16 hrs.	85D	6200	11200	Gray
C-1509*	1:1 by weight	15	16 hrs.	60D	2750	n/a	Off White
C-1515	100:120 by weight	3	20 min.	50D	1800	n/a	Black
C-1520	100:120 by weight	10	45 min.	50D	1800	n/a	Black
Crystal Clear 200	100A:90B by weight	20	16 hrs.	80D	2500	2208	Clear
Crystal Clear 202	100A:90B by weight	9	90 min	80D	2500	2208	Clear
Crystal Clear 204	100A:90B by weight	120	48 hrs	80D	2500	2208	Clear
Crystal Clear 206	100A:90B by weight	120	48 hrs	80D	2500	2208	Clear
Crystal Clear 220	100A:75B by weight	22	4 hrs.	85D	8190	N/A	Clear
Crystal Clear 221	100A:75B by weight	75	4 hrs.	85D	8190	N/A	Clear
Plasti-Paste	1:3 by volume	10	4 hrs	70D	N/A	N/A	Off- White
SMASH!™ Plastic	1:1 by volume	5	90 min. ‡	80D	N/A	N/A	Clear
Feather Lite™	1:1 by wt./vol.	8.5	2 hrs.	58D	N/A	N/A	Beige
Shell Shock™ Fast	1:3 by volume	3	1 hr.	85D	3100	N/A	Beige
Shell Shock™ Slow	1:3 by volume	8	5 hrs.	85D	3100	N/A	Beige
CASTING COMPOUND	A:B MIX RATIO	POT LIFE (MIN.)	DEMOLD TIME +	ULTIMATE SHORE HARDNESS	TENSILE STRENGTH (PSI)	COMPRESSIVE STRENGTH (PSI)	COLOR		BUY ONLINE
TASK™ High Performance Plastics
TASK™ 2	1:1 by volume	7	60 min.	80D	6650	8300	White
TASK™ 3	1:1 by volume	20	90 min.	80D	6650	8300	White
TASK™ 4	1:1 by weight	20	16 hrs.	83D	6500	7400	Ivory
TASK™ 5	1:1 by volume	3	15 min.	80D	3900	4700	Tan
TASK™ 6	1:1 by volume	7	75 min.	80D	5200	5500	Tan
TASK™ 8	1:1 by volume	2.5	10-15 min.	80D	7200	9500	Off-White
TASK™ 9	1:1 by volume	7	60 min.	85D	7800	11,000	Clear Amber
TASK™ 12	100:44 by wgt.	20	16 hrs.	60D	2700	N/A	Clear Amber
TASK™ 15	75:100 by weight	6	60 min.	75D	2720	5450	Opaque White
TASK™ 21	2:1 by volume	7	60 min.	75D	5500	7100	White
EPOXIES ^ (below properties derived using Sonite 16 Hardener)
A-30 Aluminum Filled	100:8 by weight	90	16 hrs.	Barcol 80	3500	14000	Gray
Formula 20-136	100:15.5 by weight	90	16 hrs.	Barcol 55	4500	13000	Beige
CASTING COMPOUND	A:B MIX RATIO	POT LIFE (MIN.)	DEMOLD TIME +	ULTIMATE SHORE HARDNESS	TENSILE STRENGTH (PSI)	COMPRESSIVE STRENGTH (PSI)	COLOR

+ cure time can vary depending on mass
* suitable for some FDA/USDA applications - dry food contact only
‡ Can be broken after 6 hours.  Read the technical bulletin.
^ properties will vary depending on hardener used

Multi-Purpose Urethane Casting Resins

SC-300 Series * SC-320 Series * SC-Colormatch™ Series  *  SC-Semi-Rigid Series

The Smooth-On family of multi-purpose urethane casting resins offers the user tremendous versatility and economy. These products feature the convenience of a one-to-one mix ratio by volume -- no scale is necessary. Very low viscosity ensures easy mixing, pouring and exact duplication of detail. These urethane resins cure with negligible shrinkage to hard plastics that are tough, durable, machinable and paintable. They also resist moisture and mild solvents. Vibrant color and color effects are easily achieved by adding pigments.

SC 45D,60D & 61D - our least expensive semi-rigid, impact resistant urethane resins.  These plastics can really take a beating.  Amber color allows easy coloration with So-Strong color tints.

SC-300, SC-305 and SC-310 - the lowest viscosity of any casting resins available. They literally pour like water and yield castings that are bright white and virtually bubble-free. They have no odor and contain no solvents (low shrinkage factor). SC-300 is ideal for making fast castings and can be consistently foamed. SC-310 has a 20 min. pot life for applications requiring a longer cycle time.

SC-320, SC-321 and SC-322 - lower cost version of SC 300 Series.  Off-white in color.

C-1508 - our hardest and most durable urethane plastic. Originally developed to make vacuum forming molds, C-1508 is aluminum filled (looks like aluminum) and can be cast in thick sections with negligible shrinkage. Fully cured C-1508 can be machined (drilled, sawed, sanded, filed, tapped, etc.) and painted.

C-1509 - semi-rigid plastic (has some flexibility) that is strong and very tough. Originally developed for high impact tooling (drop hammer punch), C-1509 also offers good abrasion and chemical resistance. This product is suitable for some FDA/USDA applications - dry food contact only.


C-1515 - a soft semi-rigid plastic that offers a fast cure and demold time. C-1515 is flexible enough to be used as a fast setting mold material or for quick model duplication. Cured castings exhibit good heat and chemical resistance. C-1520 is essentially the same material, but offers a longer pot life and demold time.

Crystal Clear 200, 202 and 204 - for applications that require absolute clarity. They feature a low viscosity system that cures at room temperature with negligible shrinkage to a hard plastic. Cured castings are water white clear, UV stable and will not yellow over time. Vibrant or tint colors are achieved with color pigments. The Crystal Clear Series has Shore 50A and Shore 95A flexible counterparts: Clear Flex 50 and Clear Flex 95.

Crystal Clear 220 & 221 - Heat cure resin systems that are a harder version of other Crystal Clear Series resins that cures to an 85D Shore hardness.

TASK™ High Performance Plastics

TASK™ Plastics are a new generation of performance urethane 
casting resins that offer superior physical properties compared to our popular Smooth-Cast line of general purpose casting resins. 

TASK™ Plastics feature convenient mix ratios, low viscosities, high tensile and flexural strength, as well as high flexural modulus. These plastics were formulated for a variety of industrial applications including making prototype models, pattern making, and making high impact rotational castings (TASK™ 15).

SMASH!™ Plastic

SMASH!™ Plastic is a new urethane liquid plastic designed to shatter on impact ("breakaway glass")Truly looks and sounds like breaking glass.  Cast thin to make window panes or rotationally cast to make hollow bottles.  Read the technical bulletin carefully for details.

Epoxy Casting Compounds

Smooth-On Epoxy Casting Compounds are suitable for a variety of industrial applications. Epoxy Compounds are harder than our urethane plastics and offer superior resistance to impact, abrasion and heat distortion. Used in conjunction with an appropriate hardener (Sonite 01, 03, 07, 08, 11, 16 hardeners), different properties are attainable. Consult technical bulletins for complete details.

A-30 Aluminum Filled - Non-settling, low viscosity with low overall shrinkage.

Formula 20-136 Mineral Filled - Superior heat resistance, low viscosity, readily degasses itself. Can be used as a high temperature epoxy adhesive (resists temperatures up to 350 F / 177 C).

Foam-iT!™ Series Rigid Urethane Foams

FOAM-iT!™ 3, 5, 8, 10 & 15 will expand many times their original volume 
when mixed one to one by volume. Developed for a variety of industrial and special effects applications., these foam products can be pigmented to achieve various color effects. FOAM-iT!™ is especially useful as reinforcement for hollow castings.

Information & Accessories

Technical Bulletins Available - Metal Cold Casting, Foaming SC 300, Adding Pigments, Making Rubber Molds, and many others.

URE-FIL™ 3, 5 & 7 Fillers - low cost, lightweight filler that are easily dispersed in most Smooth-On resins to attain different finishes and effects. Acts as an extender - lowers the cost of each casting.

Mold Release Agents - Aerosol and non-aerosol releases made especially for mold making and casting. Also please check our sister site, Mann Formulated Products.

SO-Cure™ Accelerator - Accelerates the cure time of most Smooth-On plastic compounds. 

SO-Flex™ Universal Flexibilizer- Available to soften most Smooth-On rubber and plastic compounds.

URE-BOND™ 3 Adhesive - for permanently bonding a variety of materials or repairing torn urethane molds.

SO-Strong Color Tints - For vibrant colors or special color effects, these pigments are concentrated (a little goes a long way) and can be used with our rigid or flexible compounds.

Cast Magic™ Powders & Glitters - A new and easy way to add an endless variety of bright metallic, glitter & color effects to your castings.

Metal Powders - Bronze, brass, copper and nickel/silver powders can be added to Smooth-Cast™ 325 Colormatch™ for cold metal casting to create the look of real metal castings.

XTEND-IT™ Dry Gas Blanket - Significantly extends the shelf life of unused polyurethane products after container has been opened.

Ask About Our Silicone, Urethane & Polysulfide Rubbers!

The most complete line of liquid rubber compounds available anywhere in the world. Ideal for a variety of industrial and art related projects. Available in a range of Shore A hardness's from a sponge-like "00" to a harder-than-a-car-tire 90A. Good for making both pourable and brush-on molds, these products are easy to use (many are mixed 1:1 by volume - no scale necessary) and will last/perform in production.