Polyurethane (PU) adhesives and sealants are integral to various industries within the Australian trades sector. From waterproofing and roofing to auto manufacturing, PU products offer unique characteristics. This guide provides an in-depth look into what polyurethane is, why it's essential, and how it's used in the industry.

What Is Polyurethane?

Polyurethane is a type of polymer formed by connecting chains of polyol and isocyanate. Imagine these chains as beads and hooks, and when connected, they create a strong puzzle-like structure. The curing process can be adjusted, allowing the final product to be hard or flexible.

Properties of Polyurethane

  • Strength: PU's strong adhesion and cohesive bonding make it ideal for various applications.
  • Flexibility: It can bend without breaking, providing adaptability to different substrates.
  • Durability: PU acts as a protective shield against rain, sun, and chemicals, particularly suitable for the Australian climate.

Applications in Various Industries

  • Construction: Sealing gaps, bonding materials, waterproofing.
  • Automotive: Assembling car parts, sealing windows.
  • Medical: Safe for medical devices due to its inert properties.

Types of Polyurethane Products

  • One-Component: Ready-to-use products, similar to a glue stick.
  • Two-Component: Mixable components for custom applications, akin to baking with various ingredients.
  • Thermosetting: Becomes hard upon heating, like baking clay.
  • Thermoplastic: Remains flexible, similar to chewy candy.


Polyurethane adhesives and sealants are versatile tools used across a wide array of trades. From construction to automotive manufacturing, understanding PU's properties and applications can help choose the right product for specific needs.

Key Takeaways

  • Polyurethane is formed by connecting chains of polyol and isocyanate.
  • PU offers unique properties like strength, flexibility, and durability, ideal for various applications.
  • Understanding different types of PU products helps in selecting the right product for specific projects.

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