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P508 PlatSil Silicone

  • $38.00

Magikmold® P-508 is a platinum-cured, room temperature curing (RTV), translucent silicone rubber designed for the manufacture of high-performing, flexible molds. This two-part (Catalyst & Base), liquid silicone rubber has a Shore Hardness of A8, a pour time of ~20 minutes, and a demold time of ~3-4 hours.

This very soft silicone is popular for making molds of highly detailed and delicate objects (e.g., candle and soap molds).

Magikmold® P-508 molds are commonly used to cast the following materials:

  • Urethane (polyurethane) plastic and rubber
  • Plaster
  • Polyester Casting Resin
  • Cement, Concrete
  • Epoxy
  • Soap
  • Wax
  • Low-Melt Metals

Release agent is not necessary for casting most materials into P-500 Series molds, but for longer mold life with epoxy, polyurethane or polyester resins, a barrier coat or release agent (2500 Release) is recommended.


Physical Properties

Type Platinum-cured (addition-cure)
Mix Ratio by Weight 1A:1B
Shore Hardness A8
Pot Life 20 min.
Demold Time @ 77°F 3-4 hr.
Cured Color Translucent
Mixed Viscosity 2,400 cP
Specific Volume 26.6 in³/lb
Specific Gravity 1.04
Tensile Strength 185 psi
Elongation 781 %
Die B Tear Strength 35.4 pli
Die T Tear Strength 11.8 pli


CURE INHIBITION: Contamination from amines, sulfur, tin compounds, polyester resins, some paints and some silicone rubbers may inhibit surface cure of this product. Perform a test cure on an identical surface to determine that complete curing and good release are obtained.

Product Literature

Technical Bulletin: Magikmold® P-500 Series Technical Data Sheet

Safety Data Sheets: Magikmold® P-508 Catalyst & Base SDS

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