PlatSil® 73-29 Silicone Rubber

PlatSil® 73-29 is a 1A:10B mix, mid-range hardness (A30), platinum silicone liquid mold rubber. Molds made from this liquid rubber exhibit long library life, high-performance and no shrinkage on cure.

PlatSil 73-29 is great for making molds for all types of resin casting (polyurethane, polyester, epoxy) and foam casting; application of release agent is not required prior to casting. Molds are often used for prototyping, model making, hobby reproduction, taxidermy, soap and candle making, and much more.

Pour as supplied or thicken for brush-on molds using PlatThix liquid thickener.

For a 1A:1B mix ratio rubber similar in hardness to PlatSil 73-29, consider PlatSil 73-25.


Mix Ratio Shore Hardness Pour Time Cured Color Mixed Viscosity Specific Volume Demold Time
1A:10B A30 45 min. White 15,000 cP 25.0 in³/lb 16 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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