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A Closer Look: Polyurethane Prepolymer 90A Hardness for PU Rollers EMH490-A / EMH490-B

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December 03, 2025
Category Connection: Cold Cast Polyurethane
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#High Rebounding 2 Component Polyurethane #Shoe Mold Cold Cast Polyurethane #Yellowish Liquid Cold Cast Polyurethane
Brief: In this walkthrough, we highlight key design ideas and how they translate to performance. You'll see a detailed demonstration of the EMH490-A / EMH490-B polyurethane prepolymer system, showcasing its processing from liquid components to a durable 90A hardness elastomer. We'll explore its fast curing properties, high transparency, and exceptional resilience for industrial applications like rollers and molds.
Related Product Features:
  • Offers excellent abrasion and hydrolysis resistance for long-lasting performance.
  • Provides high transparency with the option for color customization using pigments.
  • Delivers superior resilience and dimensional stability under various conditions.
  • Features fast curing with a short gel time of 6-9 minutes at 25-30°C.
  • Solidifies at common temperatures for easy processing and handling.
  • Exhibits a tensile strength of 13-18 Mpa and elongation at break of 400-450%.
  • Has a tear strength of 58-63 kN/m, ensuring durability in demanding applications.
  • Suitable for diverse uses including rollers, molds, and electrical potting.
Faqs:
  • What are the main applications for the EMH490-A / EMH490-B prepolymer system?
    This system is ideal for industrial applications such as cultural stone mold production, electrical equipment potting, rubber rollers, plates, wheels, ski and snowboard components, and shoe models and manufacturing.
  • What is the mixing ratio and gel time for this two-component system?
    The mixing ratio is a 1:1 mass ratio of EMH490-A to EMH490-B, with a gel time of 6-9 minutes at 25-30°C, allowing for efficient and fast processing.
  • How should the EMH490-A / EMH490-B prepolymer be stored and what is its shelf life?
    Store in a cool, dry place. For partial use, fill the container with nitrogen gas before resealing. The shelf life is 6 months from the production date when stored under recommended conditions.
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