Spray foam is formulated in a lab and applied in an attic in February. The gap between those two conditions is where most SPF complaints live: slow or uneven cure, off-ratio passes, lingering amine odor at reoccupancy, and yield that does not match the board-foot claim.
MCPU builds SPF systems around the substrate temperature and rig conditions the applicator will actually see, not around ideal bench conditions.
What this application has to hit
- Predictable cure across cold and humid substrate conditions
- Low residual amine odor and reduced VOC at reoccupancy
- Consistent yield and adhesion pass to pass
- Field-applied fire performance including ignition barrier and thermal barrier assemblies
- Closed-cell content and aged R-value for ccSPF
How MCPU formulates for it
Reactive and low-emission catalyst packages cut the fugitive amine load that drives odor complaints while keeping gel and tack-free times in the applicator's working window.
Yellow Jacket™ provides halogen-free flame-retardant performance in both ccSPF and ocSPF without the smoke penalty of chlorinated phosphates.
Blend stability is validated over storage so the B-side sprayed in month six behaves like the one sprayed in week one.
Formulation levers we adjust
| Lever | What it controls |
|---|---|
| Catalyst package | Reactive amines reduce emissions; balance set for cold-substrate cure. |
| Blowing agent | HFO compatibility and blend stability checked at storage temperature. |
| Surfactant | Controls cell size, adhesion and yield across pass thickness. |
| FR loading | Sized to the assembly test being claimed, not to a generic target. |
Products used here
- Yellow Jacket™ — Halogen-free flame-retardant additive system for rigid PIR & polyurethane foam.
- Honey Bee® — Reactive soy-based polyols and modifiers for resilient, lower-carbon polyurethanes.
- Custom Formulation Development — Bench-to-plant formulation development, reverse engineering, and toll-blended production.