PlatSil® 73-25 Silicone Rubber


PlatSil® 73-25 Silicone Rubber is a two-part, platinum-catalyzed, liquid silicone system that cures (RTV) to a green, Shore A25 rubber. This is a pourable rubber, but it can be easily thickened with PlatThix Liquid Thickener or Fumed Silica for brush-on application. The yellow colored Part A and green colored Part B make it easy to see when mixing is complete. A uniform, light, lime-green color means you’re good to go!


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Technical Specifications

Mix Ratio by Weight:
Shore Hardness:
Pour Time:
15 min.
Demold Time:
4-5 hr.
Cured Color:
Mixed Viscosity:
6,000 cP
Specific Volume:
24.3 in³/lb
Specific Gravity:
405 %
Tensile Strength:
380 psi
Die B Tear Strength:
120 pli
Die T Tear Strength:
30 pli
Shake or stir Part A & Part B before use.
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® 73-25 Components
2-lb kit includes: 1 lb of PlatSil® 73-25 Part A (~1 pint)
1 lb of PlatSil® 73-25 Part B (~1 pint)
16-lb kit includes: 8 lb of PlatSil® 73-25 Part A (~1 gallon)
8 lb of PlatSil® 73-25 Part B (~1 gallon)
80-lb kit includes: 40 lb of PlatSil® 73-25 Part A (~5 gallons)
40 lb of PlatSil® 73-25 Part B (~5 gallons)