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Mold Star™ Platinum Cure Silicone

Buy Smooth-On at FormX

Smooth-On is one of the worlds leading manufaturers 3D modeling materials such as mold-making, casting and special effects materials but also industrial casting resins, adhesives and equipment. FormX is main distributor of Smooth-On products in Europe.

Mold Star™ Series

Mold Star™ Series - Easy to Use Silicone Mold Rubber

Mold Star™ silicones cure to soft, strong rubbers which are tear resistant and exhibit very low long term shrinkage. Molds made with Mold Star™ will last a long time in your mold library and are good for casting wax, gypsum, resins, and other materials. Cured Mold Star™ rubber is heat resistant up to 232°C and is suitable for casting low-temperature melt metal alloys.

One to One Mix Ratio - Mold Star™ rubbers are mixed 1A:1B by volume (no weighing scale necessary) for precise measurements even at a very low mass and cure at room temperature with negligible shrinkage.

No Vacuum Degassing -Mold Star™ silicones feature relatively low viscosities making vacuum degassing optional and is not required for most applications. A uniform flow will help minimize entrapped air.

Translucent Options -Make Fast Cut Molds or Castings Mold Star™14T, 19T, 20T, and 31T are translucent silicones for making fast molds or casting into alginate molds. They offer fast cure times, multiple hardnesses, and an infinite number of color effects achieved by adding Silc Pig™ silicone pigments or Cast Magic™ effects powders.

Mold Star 15 Slow

Mold Star™15 Slow products

  • Mold Star™15 Slow / 8,16 kg

    Shore A15 | Cure Time: 4H00

    264,14 EUR

  • Mold Star™ 15 Slow /40 kg

    Shore A15 | Cure Time: 4H00

    1.200,86 EUR

Mold Star 16 Fast

Mold Star™16 Fast products

  • Mold Star™ 16 Fast 400 ml

    Shore A16 | Cure Time:30min

    25,53 EUR

  • Mold Star™16 Fast / 0,91 kg

    Shore A16 | Cure Time:30min

    38,30 EUR

  • Mold Star™ 16 Fast / 8,16 kg

    Shore A16 | Cure Time:30min

    264,14 EUR

Mold Star 14 T,19T, 20T & 31T

Mold Star™ T Series

  • Mold Star™ 14T /0,9kg

    Shore A14| Cure Time: 9 min

    37,22 EUR

  • Mold Star 14T /8,16kg

    Shore A14| Cure Time: 9 min

    236,62 EUR

  • Mold Star™ 19T /0,91 kg

    Shore A19 | Cure Time:12 min

    37,61 EUR

  • Mold Star™ 19T /0,91 kg

    Shore A19 | Cure Time:12 min

    37,61 EUR

  • Mold Star™ 20T / 0,91 kg

    Shore A20 | Cure Time:30min

    37,61 EUR

  • Mold Star™ 20T /7,26 kg

    Shore A20 | Cure Time:30min

    238,19 EUR

  • Mold Star™ 20T /36 kg

    Shore A20 | Cure Time:30min

    1.086,91 EUR

  • Mold Star™ 31T /0,91 kg

    Shore A30 | Cure Time:23 min

    37,22 EUR

Mold Star 30

Mold Star™30 products

  • Mold Star™ 30 / 0,91 kg

    Shore A30 | Cure Time:6H00

    38,88 EUR

  • Mold Star™ 30 / 7,98 kg

    Shore A30 | Cure Time:6H00

    236,62 EUR

  • Mold Star™ 30 /39.9 kg

    Shore A30 | Cure Time:6H00

    1.230,17 EUR



product name A:B mixing Ratio Demold Time Elongation at Break Mixed Viscosity Pot Life Shore A Hardness Tear Strength Specific Gravity
Mold Star 15 1:1 by volume 4 hours 440% 12500 cps 50 min 15 88 pli 1.18 kg/lt
Mold Star 14 T 1:1 by volume 9 min 740 % 11,000 cps 3 min 14A 90pli 1.08 g/cc
Mold Star 16 1:1 by volume 30 min 440% 12500 cps 6 min 16 88 pli 1.18 kg/lt
Mold Star 19T 1:1 by volume 3 min 740% 11000  cps 12 min 19 90 pli 1.08 kg/lt
Mold Star 20T 1:1 by volume 6 min 740% 11000 cps 30 min 20 90 pli 1.08 kg/lt
Mold Star 30 1:1 by volume 6 hours 339% 12500 cps 45 min 30 88 pli 1.21 kg/lt
Mold Star 31T 1:1 by volume 5 min 400% 11000 cps 23 min 31 90 pli 1.08 kg/lt

Note: This product will not cure against surfaces containing sulfur, even when sealed.

Cure Inhibition - Addition cured silicone rubber may be inhibited by certain contaminants in or on the pattern to be molded resulting in tackiness at the pattern interface or a total lack of cure throughout the mold. Latex, sulfur clays, certain wood surfaces, newly cast polyester, epoxy or urethane rubber may cause inhibition. If compatibility between the rubber and the surface is a concern, a small-scale test is recommended. Apply a small amount of rubber onto a non-critical area of the pattern. Inhibition has occurred if the rubber is gummy or uncured after the recommended cure time has passed. To prevent inhibition, one or more coatings of a clear acrylic lacquer applied to the model surface is usually effective. Allow any sealer to thoroughly dry before applying rubber.

If you are not sure if your clay contains sulfur, do a small compatibility test before using for an important project.

Applying A Release Agent - Although not usually necessary, a release agent will make demolding easier when casting into most surfaces. Ease Release™ 200 is a proven release agent for releasing silicone from silicone or other surfaces. Mann Ease Release™ products are available from form x

Because no two applications are quite the same, a small test application to determine suitability for your project is recommended if performance of this material is in question.

Measuring & Mixing - Before you begin, pre-mix Part A and Part B separately. After dispensing required amounts of Parts A and B into mixing container (1A:1B by volume), mix thoroughly making sure that you scrape the sides and bottom of the mixing container several times. The rubber should be a uniform color with no streaks.

Optional... Vacuum Degassing - Although not necessary, vacuum degassing helps eliminate any entrapped air in pourable silicone rubber. After mixing parts A and B, vacuum material for 2-3 minutes at 0,98 bar, making sure that you leave enough room in container for product expansion.

Pouring - For best results, pour your mixture in a single spot at the lowest point of the containment field. Let the rubber seek its own level. A uniform flow will help minimize entrapped air. If using as a mold material, the liquid rubber should level off at least 1.3 cm over the highest point of the model surface.

Heat Curing - Time to demold can be reduced by applying mild heat.
Adding an appropriate amount of Plat-Cat™ cure accelerator will also reduce demold time.
The pot life and cure times can be extended using Slo-Jo™ cure retarder.
Do not cure rubber where temperature is less than 18°C.

Mold Performance & Storage - The physical life of the mold depends on how you use it (materials cast, frequency, etc.). Casting abrasive materials such as concrete can quickly erode mold detail, while casting non-abrasive materials (wax) will not affect mold detail. Before storing, the mold should be cleaned with a soap solution and wiped fully dry. Two part (or more) molds should be assembled. Molds should be stored on a level surface in a cool, dry environment.

Safety - Use in a properly ventilated area (“room size” ventilation). Wear safety glasses, long sleeves and rubber gloves to minimize contamination risk. Wear vinyl gloves only. Latex gloves will inhibit the cure of the rubber. Store and use material at room temperature (23°C). Warmer temperatures will drastically reduce working time and cure time. Storing material at warmer temperatures will also reduce the usable shelf life of unused material. These products have a limited shelf life and should be used as soon as possible.

Mold Star's videos

Mold Star mold making #1

Mold Star #2

making artificial coral reef

Casting Crystal Clear


You might also need...

  • Mixing Beakers
  • Measuring Cups & Jars
  • Weighting devices
  • Brushes
  • Protective Gear such as gloves
  • Release agents
Mixing, Measuring & Weighting

Mixing, Measuring & Weighing


  • Measuring Cup /30ml

    Measuring Cup /1oz

    0,19 EUR

  • Measuring cup /125ml

    Measuring cup /4oz

    0,48 EUR

  • mixing / measuring cup 350 ml

    Mixing and measuring beaker

    0,57 EUR

  • mixing / measuring cup 700 ml

    Mixing and measuring beaker

    0,63 EUR

  • mixing / measuring cup 1400 ml

    Mixing and measuring beaker

    0,80 EUR

  • mixing / measuring cup 2300 ml

    Mixing and measuring beaker

    1,46 EUR

  • SO mixing cup /473ml

    SO mixing cup /16oz

    1,04 EUR


  • SO mixing cup /946ml

    SO mixing cup /32oz

    1,09 EUR

  • SO mixing cup /1892ml

    SO mixing cup /64oz

    2,84 EUR

  • SO mixing cup /4880ml

    SO mixing cup /165oz

    3,35 EUR

  • Mixing beaker round

    500 cc contents

    0,25 EUR

  • mixing beaker 1000cc

    plastic mixing beaker 1162 ml

    0,64 EUR

  • Mixing Bowl 2000 ml

    180x180 mm - 2000 cc

    0,91 EUR

  • Flexible mixing cup 500ml

    Flexible mixing bow

    8,05 EUR


  • Flexible mixing cup 1750ml

    Flexible mixing bowl

    19,34 EUR

  • Syrenge 50ml

    Syringe 50 cc with catheter nozzle.

    5,76 EUR

  • Wooden tongue spatula

    Mixing, resins, foams & rubbers.

    3,42 EUR

  • stirring stick 22cm

    220x17x3 mm

    0,05 EUR

  • stirring stick 30cm

    strong stirring stick

    0,24 EUR

  • Colad Turbomix /per 200

    Paint stirrers stirrers in dispenser.

    61,38 EUR

  • Turbine Mixer

    For use with electrical drill

    17,70 EUR



  • flat brush 30mm

    flat disposable brushes

    0,80 EUR

  • flat brush 40mm

    flat disposable brushes

    0,92 EUR

  • flat brush 50mm

    flat disposable brushes

    1,39 EUR

  • flat brush 60mm

    flat disposable brushes

    1,38 EUR

  • flat brush 70mm

    flat disposable brushes

    1,39 EUR

  • Calupaint flat brush 40mm

    Calupaint flat brush

    2,60 EUR

  • brush 40mm, wooden handle

    Brush, flat, 40mm, wooden handle.

    2,84 EUR

  • polyesterkwast 20mm

    polyester brush 20mm round

    3,09 EUR

  • polyesterkwast 25mm

    polyester brush 25mm round

    3,51 EUR

  • polyesterkwast 35mm

    polyesterkwast 35mm

    2,21 EUR

  • polyesterkwast 50mm

    polyesterkwast 50mm

    3,46 EUR

  • Polyester kwast plat 75mm

    Polyester brush, Flat, 75 mm

    3,33 EUR

Protective Gear

Protective Gear

  • 3M safety glasses Classic

    3M safety glasses Classic

    15,19 EUR

  • Glove Nitrile XL

    Glove Nitrile XL

    11,01 EUR

  • Glove Nitrile M

    Glove Nitrile M

    11,01 EUR

  • Glove Nitrile L

    Glove Nitrile L

    11,01 EUR

  • Glove Nitrile S

    Glove Nitrile S

    11,01 EUR

  • Paint spray mask Colad

    Complet easy to wear paint spray mask.

  • Filter ABEK1

    For 3M 6200 maskers

    36,87 EUR

  • Stenchmask carbon fibre

    Stenchmask carbon fibre

    5,41 EUR

  • 3M 06941 Halfgelaatmasker


    50,53 EUR

Release Agents

Release Agents

Spray Releases

  • Safety Info Acmos

  • Acmos 82 aerosol /400gr

    Removable universal release agent/ wax based / aerosol spraycan

    20,63 EUR

  • Ease Release™ 200 /340 gr

    Ease Release™ 200 /340 gr

    21,16 EUR

  • Ease Release™ 300 /340 gr

    Ease Release™ 300 /340 gr

    20,24 EUR

Spray Releases

Spray Releases


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  • Foam

    expanding flexible and rigid foams, rigid blocks.

  • Restoration

    restoring in- and exterior ornaments and buildings.

  • Prototyping

    resins and other materials used for rapid prototyping.

  • Textile

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