PlatSil® 71-20 Silicone Rubber

platsil-71-20PlatSil® 71-20 is a fast-curing, 1A:1B mix, mid-range hardness platinum silicone liquid mold rubber. Molds made from PlatSil 71-20 are quite flexible and are great for intricate models with undercuts.

PlatSil 71-20 molds are often used for resin casting (polyurethane, polyester, epoxy), wax casting and plaster casting. Common applications include prototyping, model making, hobby reproduction, taxidermy, soap and candle making and much more.  Release agents are not necessary for casting most materials.

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


Mix Ratio Shore Hardness Pour Time Cured Color Mixed Viscosity Specific Volume Demold Time
1A:1B A20 25 min. Light Purple 12,000 cP 24.7 in³/lb 4 hr.
Accessories: PlatThix Liquid Thickener, PlatSil® 71/73 Part R Retarder, Silicone Fluid 50cs, PlatSil® 71/73 Part X Accelerator


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

Video Tutorials on YouTube: How to Make a PlatSil® 71-20 Poured Block Mold [Part I – Preparing the Model]  |  How to Make a PlatSil® 71-20 Poured Block Mold [Part 2 – Making the Mold] 


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