Dow Silicones for the production of flexible molds and Rampf Resins for casting into silicone molds and making objects.

Dow moldmaking silicones are easy to use, resist tearing with repeated use, hold severe undercuts and offer:

  • Excellent natural release characteristics
  • Good resistance to most chemicals
  • Tailorable working times and cure rates
  • Excellent mold release properties

Rampf polyurethane resins are casted into silicone molds producing exact replicas of the original:

  • They do not smell like polyester.
  • They have minimal shrinkage.
  • There are very fast products, 30 minutes demold time
  • They can be painted externally (after curing) and into the resin mass.
  • They can be mixed with inorganic powders to reduce costs and increase hardness.

There are also resins for making rigid molds and models for applications such as metal forming molds, vacuum forming, foundry patterns and general modeling.

We also offer synthetic boards with various properties that can be carved on CNC and quickly produce molds and models.

Picture gallery

Silicone moldmaking rubbers

Dow Silastic RTV 3481 – Silicone mold making rubber

  • Medium hardness (Shore A20)
  • High tear resistance
  • Casting Materials:
    • Resins (polyurethane, polyester, epoxy)
    • Wax, Soap
    • Plaster, Clay, Cement
  • Service Temperature: up to 200οC
  • A choice of 3 curing agents to use with different curing time: 3081-R (24h), 3081-F (6h), 3081-VF (2h)
  • Colour: White
  • Packaging: Kits 1.05 kg, 5.25 kg, 21 kg

Dow Silastic RTV 4136 Μ – Silicone mold making rubber

  • Very low shrinkage silicone mold making rubber
  • High hardness (Shore A60)
  • High tear resistance
  • Casting Materials:
    • Resins (polyurethane, polyester, epoxy)
    • Wax, Soap
    • Plaster, Clay, Cement
  • Service Temperature: up to 200οC
  • Slow speed curing (polymerizes in 24 hours)
  • Colour: Blue
  • Packaging: Kit 4,04 kg, 22 kg

Polyurethane resins for casting inside silicone molds.

Rampf Raku-Tool PH 3977 / PF 3701-2 – Fast Cast Polyurethane Resin

  • Two component polyurethane resin
  • Hard (Shore D 75), Good impact resistance
  • Fast cure (5 min. pot life, 45 min. demold time)
  • Applications:
    • Folk art casting, sculptures, models
    • Accessories, replicas
    • Vacuum forming molds
  • Service Temperature: 70 – 80οC
  • Colour: White
  • Packaging: Kit 2kg, 9kg, 40kg

Rampf Raku-Tool PH 3977 / PF 3700-2 – Very fast cast polyurethane resin

  • Two component polyurethane resin
  • Hard (Shore D 75), good impact resistance
  • Fast cure (3 min. pot life, 30 min demold time)
  • Applications:
    • Folk art casting, sculptures, models
    • Accessories, replicas
    • Vacuum forming molds
  • Service Temperature: 70 – 80οC
  • Colour: White
  • Packaging: Kit 2kg, 9kg, 40kg

Rampf Raku-Tool AC-9004 – Inorganic filler for polyurethane resin

  • Inorganic filler for polyurethane and epoxy resins.
  • Reduces the cost of the end product.
  • Makes the final product harder and heavier.
  • Increases the thickness of each casting.
  • Specific weight: 2,4 gr/cm3
  • Colour: White
  • Packaging: Pail 20 kg

Rampf Raku-Tool AC-9002 – Light mineral filler for polyurethane resin

  • Inorganic light mineral filler for polyurethane and epoxy resins.
  • Reduces the cost of the end product.
  • Makes the end product lighter.
  • Increases the thickness of each casting.
  • Specific weight: 0,40 gr/cm
  • Colour: Grey
  • Packaging: Bag 20 kg

Resins for rigid molds

Rampf Raku-Tool PH-3903 / PC-3403 – Slow cure, polyurethane resin for mass casting.

  • Low exothermic reaction, can be cast in thick layers and large volumes.
  • Slow curing (40 min. pot life, 18 hours demold time)
  • Applications:
    • Metal sheet forming tools
    • Vacuum forming molds
    • Production of undersized cores for foundry patterns / core boxes, molds for prototyping.
  • Resistant to temperature up to 80οC
  • Colour: Beige
  • Packaging: Kit 9 kg, 45 kg

Rampf Raku-Tool ΕC-2402 / EH-2905-1 – Epoxy resin with metal fillers

  • Epoxy casting sytem with very high compressive strength.
  • Slow curing (80 min. pot life, 16 hours demold time).
  • Applications:
    • Metal forming molds for the production of frames and images.
    • Foundry patterns, copy models.
  • Resistant to temperature: up to 60οC
  • Colour: Black
  • Packaging: Kit 2,14 kg, 15,5 kg

Release Agents

Rampf Raku-Tool AC-9103 – Liquid Release Agent

  • Wax based liquid release agent.
  • For use in silicone, epoxy and polyurethane molds.
  • Low viscous, it does not alter the details of molds and prototypes.
  • Can be applied with brush or by dipping.
  • Colour: White
  • Packaging: 750ml

Dow Molykote Separator Spray – Silicone Oil Spray

  • Silicone release agent and lubricant
  • Excellent release properties
  • Complies with NSF H
  • Service Temperature: -40 up to 200οC
  • Colour: Transparent
  • Packaging: Spray 400ml

Board Materials

Rampf Raku-Tool MB 0670 – Polyurethane board for modelling

  • Polyurethane board for master models, cubic models and patterns.
  • Fine surface structure.
  • Density: 0,67
  • Service temperature: 80οC
  • Colour: Brown
  • Dimensions:
    • 25 mm (thickness) 500mm (width) Χ 1500mm (length)
    • 50 mm (thickness) 500mm (width) Χ 1500mm (length)
    • 75 mm (thickness) 500mm (width) Χ 1500mm (length)