PlatSil® 73-20 Silicone Rubber

PlatSil® 73-20 Silicone RubberPlatSil® 73-20 is a very low-viscosity (2000 cP) platinum silicone mold rubber that cures to a gray translucent color.  This transparency is useful for molds that need to be cut after cure – parting lines can be better determined because the model is visible.

The soft and flexible qualities of this Shore A22 rubber make it suitable for intricate and delicate mold making. Molds made from PlatSil 73-20 are often used to cast the following materials: resin (polyurethane, epoxy, polyester resin), wax, soap, plaster, and more. Typical applications include hobby reproduction, prototyping, candle and soap making, taxidermy, model making, and much more.

PlatSil 73-20 has the lowest viscosity of all Polytek platinum silicone rubbers. It also has the shortest working time (5 min) and demold time (1 hr) of the 73-Series rubbers.


Mix Ratio Shore Hardness Pour Time Cured Color Mixed Viscosity Specific Volume Demold Time
1A:1B A22 5 min. Gray Translucent 2,000 cP 25.0 in³/lb 1 hr.
Accessories: PlatThix Liquid ThickenerPlatSil® 71/73 Part R RetarderSilicone Fluid 50csPlatSil® 71/73 Part X Accelerator


Product Literature: Technical Bulletin | Safety Data Sheets | Physical Properties Bulletin | Sealer & Release Agent Selection Guide

Video Tutorials: For 73-Series video tutorials, visit the 73-Series page or the Polytek YouTube Channel.


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