PlatSil® 73-15 Silicone Rubber


PlatSil® 73-15 Silicone Rubber is a two-part, platinum-catalyzed, liquid silicone system that cures (RTV) to a white translucent, Shore A15 rubber. The transparent nature of the cured rubber makes it a good option for molds that need to be cut after cured – because the model is visible, parting lines can be better determined. It is also very useful when casting intricate parts to ensure that the entire mold cavity has been filled with casting material. This is a pourable rubber, but it can be easily thickened with PlatThix Liquid Thickener or Fumed Silica for brush-on application.


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Technical Specifications

Mix Ratio by Weight:
Shore Hardness:
Pour Time:
20 min.
Demold Time:
4-5 hr.
Cured Color:
White Translucent
Mixed Viscosity:
2,500 cP
Specific Volume:
25 in³/lb
Specific Gravity:
640 %
Tensile Strength:
265 psi
Die B Tear Strength:
55 pli
Die T Tear Strength:
17 pli
Cure Inhibition:
Contamination from sulfur (e.g., sulfur-based clay), amines, tin compounds, cured polyester resin, some paints and some silicone rubbers may inhibit surface cure of platinum-cured rubbers.

More Information

Material Calculator

Technical Bulletin

Safety Data Sheet

Kit Components
PlatSil® 73-15 Components
2-lb kit includes: 1 lb of PlatSil® 73-15 Part A (~1 pint)
1 lb of PlatSil® 73-15 Part B (~1 pint)
16-lb kit includes: 8 lb of PlatSil® 73-15 Part A (~1 gallon)
8 lb of PlatSil® 73-15 Part B (~1 gallon)
80-lb kit includes: 40 lb of PlatSil® 73-15 Part A (~5 gallons)
40 lb of PlatSil® 73-15 Part B (~5 gallons)