P-50 SILICONE RUBBER
P-50 is a two-component addition cure silicone rubber mold making material. It has a high durometer,
superb physical properties, minimal shrinkage and extreme chemical resistance making it an excellent
choice for prototyping, casting urethane foam and other plastics. P-50 cures at room temperature in
18-24 hours; however, the curing rate can be accelerated with Pt Accelerator at room temperature or
with heat. P-50 is a good choice for Pewter casting due to its -60 to 600 degree F temperature range.
Typical Properties
Uncatalyzed Compound
Color Base: Tan Activator: Green
Viscosity (cps) Base: 110,000 – 130,000 Activator: 1000 - 1500
Mixing Ratio (B/A) By weight: 100 / 10 By volume: 100 / 13.8
Viscosity (cps) Mixed: 70,000 – 90,000
Working Time 1 to 2 hours
Cure Time 16-24 hours
Shelf Life 6 months
Vulcanized (cured) Properties (7 days @ 70° F / 50% relative humidity)
Shore A Hardness (±4) One day: 54 + 2 hours @ 250oF 58 + 4
Tear Resistance (ASTM D624) 40 ± 10 ppi
Tensile Strength (ASTM D412) 540 ± 50 psi
Elongation (ASTM D412) 250 ± 25 %
Service Temperature (° F) -60 to 600
Shrinkage nil
Specific Gravity 1.30
Coverage (in3 / lb) 21.3
The information contained in this data sheet is, to our best knowledge, true and accurate, but all recommendations or
suggestions are made without guarantee. Since the conditions of use are beyond our control, Silicones, Inc. disclaims any
liability incurred in connection with the use of our products and information contained herein.