In addition, because they cure by reaction of the two components, they can be used to bond moisture impermeable substrates such as plasticto-plastic and plastic-to-metal.
- Two-component adhesives consist of two relatively low-molecular weight components: a polyol and an isocyanate.
- When these components are mixed they form urethane groups in the adhesive films.
- The isocyanates and polyols have a functionality of two or higher.
- Fast cure speeds can be obtained, also on assembly lines which require quick fixing of parts, especially under conditions where no heat can be applied.
- Thick glue lines can be applied, providing gap filling as well as bonding and,unlike moisture-cured adhesives, there is no foaming to interfere with the adhesive properties.
- The mix ratio of the two components can be adjusted to vary the properties within an isocyanate index range of 90 to 150.
- Two-component polyurethane adhesives can be designed to meet Food and Drug Administration (FDA) requirements for food packaging use.
- When accurately mixed, two-component adhesives systems provide bonds with excellent physical and mechanical properties.
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