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Liquid Rubber

   
 

RUBBER
COMPOUND

A:B
MIX
RATIO

SHORE A
HARDNESS

POT LIFE

MIXED
VISCOSITY

WEIGHT:
CU. IN. / LB

TEAR
 STRENGTH

ELONGATION
AT BREAK

BUY
Now

Polyurethane Rubber

 

PMC 121/30

1:1 pbv 

30

30 min 

1800 CPS

27.7

55 pli

1000%

 

PMC 121/50

1:1 pbv

50

30 min

1400 cps

26.7

80 pli

500%

 

PMC 724

1:10 pbw

40

20 min.

variable

20.5

90 pli

>700%

 

PMC 726

2:1 pbw 

60

25min

3000 cps

 20.4

100 pli

400%

 

PMC 744

2:1 pbw

45

15 min

3400 cps

27.5

90 pli

400%

 

PMC 746

2:1 pbw

60

15 min

1200 cps

26.9

100 pli

650%

 

PMC 780

2:1 pbw

80

30 min.

2000 cps

27.2

200 pli

700%

 

PMC 790

2:1 pbw

90

20 Min

3000 cps 

25.9

300 pli

600%

 

PMC 860

1:2 pbw

60

25 min.

2000 cps

25.9

180 pli

625%

 

PMC 870

2:1 pbw

70

35 min.

3000 cps

25.9

160 pli

600%

 

VytaFlex 10

1:1 pbv

10

30 min.

3100 cps

27.9

30 pli

1000%

 

Vyta Flex 20

1:1 pbv

20

30 min.

1000 cps

27.7

58 pli

1000%

 

 

 

   

 

       

VytaFlex 30

1:1 by volume

30

30 min.

1800 cps

27.3

78 pli

1000%

 

VytaFlex 40

1:1 by volume

40

30 min.

2000 cps

26.9

82 pli

660%

 

VytaFlex 50

1:1 pbv 

50

60 min.

2000 cps 

26.7

102 pli

400%

 

VytaFlex 60

1:1 by volume

60

60 min.

2000 cps

26.6

136 pli

480%

 

ReoFlex 20

1:1 by volume

20

30 min.

1000 cps

27.7

40pli

1000%

 

ReoFlex 30

1:1 by volume

30

30 min.

1800 cps

27.7

55 pli

1000%

 

 ReoFlex 40

!:1 pbv 

40

30 min

1000 cps

26.7

60 pli

1000%

 

ReoFlex 50

1:1 pbv

50

30 min.

1400 cps

26.7

80 pli

500%

 

ReoFlex 60

1:1 pbv

60

30 min.

1800 cps

26.7

125 pli

580%

 

Brush-On 35

1:1 pbv

35

30 min.

Brushable

21.5

67 pli

700%

 

Brush-On 40

1:1 pbv

40

30 min.

Brushable

23.6

60 pli

1000%

 

Brush-On 50

1:1 pbv

50

30 min.

Brushable

19.0

80 pli

400%

 

Brush-On 60

1:1 pbv

60

20 min.

Brushable

19.0

80 pli

400%

 

Clear Flex 50

1:2 by weight

50

25 min.

250 cps

26.8

25 pli

500%

 

Clear Flex 95

1:1.5 by volume

95

15 min.

250 cps

26.8

200 pli

175%

 

   

*Technical bulletins are available to provide complete information about any Smooth-On product.

Smooth-On Urethane Rubber

New ReoFlex™ Series Urethane Rubbers

ReoFlex™ urethane rubbers are "next generation" products to our popular PMC-121 Series and offer superior physical and performance properties. ReoFlex™ urethanes are available in 20A, 30A, 40A, 50A and 60A Shore hardnesses and feature convenient one-to-one by volume mix ratios. Vacuum degassing is not necessary and ReoFlex™ rubbers cure with negligible shrinkage to a durable rubber that will last in production.

ReoFlex™ rubbers are available as either "wet" or "dry" consistencies. ReoFlex™ Wet cured rubber exudes an oil to aid in demolding concrete and gypsum plasters. It will enhance abrasion resistance and increase the production life of the mold. ReoFlex™ Dry cured rubber is dry and suitable for casting wax, gypsum and resins.

ReoFlex™ mold rubbers are used for a variety of applications including making molds to reproduce sculpture and architectural elements, as well as for making special effects, toys and prototypes. These rubbers will meet the stringent demands of production casting of wax, plasters, concrete and resins.

PMC-121 Series Liquid Rubber Compounds
Convenience * Performance * Versatility

Novice and master mold makers alike know the 1-2-1 series as the liquid rubber compounds that are easy to mix (1A to 1B by volume—scale not required) and easy to pour. The PMC-121 series addresses a variety of applications from mold making (for restoration, concrete casting, sculpture, etc.) to special effects to electrical encapsulation.

PMC-121/20 - added flexibility offers easier demold of pieces with undercuts.

PMC-121/30 WET & 121/30 DRY - very strong and durable for "soft" mold rubbers, 121/30 Wet has a built-in release agent that aids in the demold of plasters or concrete and helps extend mold life. 121/30 Dry is preferred by model makers & sculptors.

PMC-121/40 WET & 121/40 DRY - harder version of 121/40.  New high strength, high tear formula.

PMC-121/50 - contains a built-in release to aid in demold. offers good abrasion resistance and longevity for production casting of harder plasters (ultra-cal, hydra-cal) and concrete.

BRUSH-ON™ 40 "Brushable" Mold Rubber Compound

Brush-On™ 40 - a softer version of our popular Brush-On 50 with an ultimate shore hardness of 40A. Brush-On™ 40 is more pliable and flexible than BO 50 but still offers excellent abrasion resistance and high tear strength. It has the convenience of a one-to-one mix ratio and is easy to mix and apply with a brush or spatula. Brush-On™ 40 paints onto vertical surfaces and will cure with negligible shrinkage to a durable rubber that performs and lasts in production.

Brush-On™ 40 is compatible with BO 50. You can apply 2 layers of BO 40 and back it up with 2 layers of BO 50. Brush-On™ 40 is suitable for production casting of wax, concrete, hard plasters and other materials. It is used for architectural restoration, reproducing sculpture and many other applications.

Brush-On™  50 & 60 - developed to offer superior tear strength and abrasion resistance. They offera convenient one-to-one mix ratio by volume and give the user ample working time to apply the material - in the studio or right on the work site. With a creamy consistency, Brush-On™ 50 & 60 paint on easily to vertical surfaces. They will cure with negligible shrinkage to a durable rubber and will stand up to repeated casting of abrasive materials like concrete. 

Brush-On 35 - a softer, more flexible version for fragile/intricate detail work.

Typical Brush-On Applications:

  • On-Site Architectural Restorations
  • Special Effects
  • Casting Cement/Concrete
  • Art Bronze Wax Molds

PMC-724 - by far the most versatile flexible mold compound available. It mixes and pours easily, curing to a durable rubber with negligible shrinkage. The low viscosity of PMC-724 ensures flawless pick-up of even the finest detail with minimal bubble entrapment.

PMC-724 PUTS YOU IN CONTROL! Using optional Part D, you can thicken PMC-724 to a paste-like consistency for vertical surface brush-on applications. If you like to work with a more flexible rubber, Part C is available to soften PMC-724 to lower durometers. A variety of colors and special effects can be achieved by adding color pigments, and for added project dimension, you can foam PMC-724. Color: Off-White.

Typical Applications

  • Art Bronze Wax Molds (Lost Wax Process)
  • Pre-cast Concrete Molds
  • Fiberglass Panel & Part Molds
  • Casting Urethane Resins and Epoxies
  • Special Effects
  • On-Site Architectural Restoration Molds

PMC-726 - offers all of the control and versatility of our popular PMC-724, but cures to an ultimate hardness of Shore A 60. It is ideal for casting chemically harsh materials (such as polyester and fiberglass - with use of PVA and release agent).

As with PMC-724, PMC-726 can be thickened for brushing on to available for vertical surfaces with optional Part D. Part C is softening PMC-726 to lower durometers.

Typical Applications:

  • Architectural Reproduction
  • Industrial Rollers
  • Casting Resins (Fiberglass, Polyester, Urethane)
  • Special Effects
  • Casting Epoxies

PMC-744 - developed specifically for the Hobby/Ceramics field and the making of ceramic molds. Years were spent in research and testing. The result is a compound that is excellent for making molds that are strong, durable and dimensionally stable. Low viscosity ensures fine detail. PMC-744 will last longer in production than plaster and will not shrink like latex, saving you time and money. Color: Light Amber.

Typical Applications:

  • Case Molds for Hobby/Ceramics
  • Pre-Cast Concrete
  • Plaster Block Molds
  • Wax Candle Molds
  • Special Effects
  • Architectural Restoration
  • Ornamental Plaster
  • Mechanical Rubber Parts
  • Casting Of A Variety Of Resins

PMC-746 - developed to make molds for casting gypsum plasters and like PMC-744, is particularly well suited for use as a case mold - especially large case molds where extra rigidity is required. Because of its durability and moisture resistant properties, PMC-746 is used by zoos and museums for a variety of molding, display/exhibit applications. Also, PMC-746 contains no mercury.

Typical Applications:

  • Large Case Molds for Hobby/Ceramics
  • Plaster Block Mold
  • Pre-Cast Concrete
  • Ornamental Plaster
  • Special Effects
  • Casting Smooth-On Rigid Polyurethanes and Epoxies

PMC-860 - new urethane rubber mold compound that has excellent performance properties. PMC-860 cures at room temperature with negligible shrinkage to a durable rubber that will last. It has good dimensional stability and exceptional abrasion resistance. It is ideal for production casting of concrete and hard plasters.

Typical Applications:

  • Concrete Production Casting
  • Plaster Block Molds
  • Ornamental Concrete
  • Concrete Stamping Pads

PMC-870 - offers strength, durability and wear resistance for repeated production use for those flexible mold applications that require a relatively hard rubber. PMC-870 is well-suited for a number of industrial applications including gaskets and pulleys, vibration and shock pads and production use with cements, hard plasters, fiberglass resins and epoxies.

Typical Applications:

  • Concrete Molds
  • Concrete Stamping Pads
  • Gaskets for Industrial Equipment
  • Industrial Rollers
  • Vibration/Shock Pads
  • Bushings and Diaphragms
  • Pre-Cast Concrete
  • Rubber Mechanical Parts

PMC-780 - designed to meet the most stringent requirements of industrial applications. PMC-780 is available in wet or dry versions and has become a standard among concrete casters because of its high tear strength and abrasion resistance. It is a very hard rubber that offers superior tear strength, tensile strength, impact and abrasion resistance. Because it is slightly harder than our 780, PMC-790 is often used to make concrete stamping molds. It is also used to make ball liners, foundry patterns and metal forming pads. You can’t get a tougher rubber anywhere!

Typical Applications

  • Industrial Rollers and Belts
  • Concrete Stamping Pads
  • Rubber to Metal Bonding Applications
  • Concrete Molds
  • Ball Mill Liners
  • Metal Forming Pads
  • Casters and Impellers
  • Foundry Patterns


Specialty Flexible Rubbers

Smooth-On makes a variety of specialty flexible and rigid products used by movie/special effects, theme park/display and model making professionals. If you don’t see what you need, perhaps we can formulate a product or help you source it. Some of our more popular specialty products include:

Clear Flex 50 & 95 – Flexible rubbers that are water clear and UV Stable. They are strong and durable - ideal for special effects, model and theme park displays, sculpture castings, etc.


Mold Making Accessories

How to Make Molds & Castings (And Live to Tell About It!) -
A comprehensive "how-to" guide that covers various aspects and materials used in the mold making and casting process. Includes step-by-step illustrations and phots on different ways to make a mold of virtually any original model, casting techniques used to make reproductions of originals and over 150 tips on mold making & casting. Available for only $3.00

DVD- "How To Make A Brush-On Mold" - takes the viewer step-by-step through the brush-on mold making process. From selecting the right materials, to preparing your model, to mixing and applying PMC-724 mold rubber, to making a plaster shell and finally making an exact duplicate of your model, the video easily conveys a system that will work for anyone. Available for only $20.00

SEMINARS: Mold Making & Casting - We offer informative, two-day intensive instruction on mold making and casting at our facility in Easton, PA. The course features instruction on a variety of mold making and casting topics with hands-on participation.

Sealing Agents and Release Agents - We manufacture a full range to cover many applications.  Aerosols and Non-Aerosol, Solvent Based or Water Based. . . Made especially for Mold Making and Casting.

KICK IT™ Cure Accelerator - reduces the cure time of most Smooth-On rubber mold compounds from overnight to just a few hours.

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

SO-Strong™ Color Tints - Used to pigment liquid rubber and liquid plastics.  Highly concentrated--only a little is need to produce vibrant colors. Colors available are White, Black, Yellow, Red, Orange, Blue, Green, Brown, Violet & Flesh.   For silicones, use Silc Pig™ silicone pigments.  Colors available are White, Black, Brown, Green, Blue, Red, Yellow, & Flesh.

In & Out™ Water Based Concrete Release Agent - economical concentrate for releasing concrete castings from Smooth-On rubber molds. Does not affect surface detail of castings. Prolongs mold life.

Ure-Bond III™- Urethane Adhesive - a premium adhesive that repairs torn polyurethane production molds or bonds cured polyurethane rubber to a variety of substrates.

Xtend-It™ - Extends the shelf life of unused polyurethanes (liquid rubber and liquid plastic products) after container has been opened.

Mold Max™ Thinner, FastCat™ & Thi-Vex™ - Additives for silicone rubber that will reduce mixed viscosity, speed up cure time or thicken the rubber for vertical application. 

For Technical Bulletins & MSDS click here  Smooth-on.com