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Northstar Polymers MPG-A25A Room-Temperature Curable Liquid Castable Polyurethane
Categories: Polymer; Thermoset; Polyurethane, TS; Thermoset Polyurethane, Liquid

Material Notes: MPG-A25A is a room-temperature-cure liquid castable polyurethane system. This ether-base polyurethane system is used in applications such as mold-making, prototyping, production of cast parts, potting, tool-making, and many other applications. MPG-A25A is designed for an easy operation for industrial applications without special casting or heating equipment. The mixing ratio between part-A (MPG-062) and part-B (PPA-059) is 1:1 by volume. The material is specially formulated to be less moisture sensitive for relatively uncontrolled processing environments. Its low viscosity also makes it easy to achieve replicating the details of the mold/original with a fine resolution. Urethane elastomer parts made of this system exhibit:
  • Fine resolution of mold details
  • Highly flexible finish for easy demolding of parts
  • Good resiliency and elongation for easy demolding of parts
  • Good cut/tear resistance for its class
  • Good performance in wet environments

The suitable applications of MPG-A25A include stamps/patterns and concrete molds designed to transfer a decorative image to wet surfaces. This material is recommended specially for making patterns with high degree of under cuts.

Information provided by Northstar Polymers.

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Mechanical PropertiesOriginal ValueComments
Hardness, Shore A 20 - 27ASTM D2240
Tensile Strength 311 psiASTM D412
Elongation at Break 291 %ASTM D412
Tear Strength 20.0 pliSplit; ASTM D624
 61.0 pliDie-C; ASTM D624
 
Processing PropertiesOriginal ValueComments
Processing Temperature 70.0 - 95.0 °FPrepolymer Temperature
 70.0 - 95.0 °FCuring Agent Temperature
Mold Temperature 70.0 - 95.0 °F
Cure Time 5.00 - 8.00 hour
@Temperature 25.0 °C
De-mold Time
 72.0 - 96.0 hour
@Temperature 25.0 °C
Complete Cure Cycle
Pot Life 20.0 min
 
Descriptive Properties
Curing AgentPPA-059
PrepolymerMPG-062
Weight Ratio1:0.966Prepolymer to Curing Agent Ratio

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PNORTH838 / 162554

Specialty Compounds RTP Company

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