Why it matters
Polyurethanes used in roofing, sealants, marine assemblies, and outdoor binders see liquid water and water vapor in cycles — and ester-based PU systems hydrolyze under prolonged moisture exposure, losing tensile strength and adhesion over time.
Ether-based polyols, hydrophobic chain extenders, and properly chosen catalysts address this — but only if the formulation is engineered for the application up front rather than patched after a field failure.
How MCPU solves it
MCP custom polyols are built on hydrolysis-stable polyether backbones with optional hydrophobic modifiers. For one-component moisture-cure systems we tune NCO content and prepolymer viscosity to match field cure conditions, and for two-component systems we balance reactivity to minimize blistering on damp substrates.
Test data & spec snapshot
Representative values — actual performance depends on your formulation. Pilot data available on request.
| Backbone options | Polyether (hydrolysis-stable), polyester (high-strength) |
|---|---|
| Cure modes | 1K moisture-cure · 2K · UV |
| Typical viscosity range | 500 – 25,000 cP at 25 °C (custom) |
Typical applications
- Fluid-applied roof coatings (Iron Sentry®)
- Joint sealants and waterproofing
- Marine and outdoor encapsulation