What it is
Yellow Jacket™ is a family of reactive and non-reactive flame-retardant additives engineered as a direct replacement for TCPP and other chlorinated phosphate flame retardants in polyisocyanurate (PIR) boardstock, spray polyurethane foam (SPF), and rigid PU systems.
Key benefits
- Developed as a TCPP replacement at comparable loadings (development starting point: 8–14 phpp).
- Developed against ASTM E84 Class A, UL 723, and CAN/ULC-S102 targets, verified on your formulation.
- Reduced smoke density vs chlorinated FRs.
- Halogen-free chemistry — no chlorine, no bromine.
- Stable in stored polyol blends; no phase separation at typical use levels.
How it works (chemistry overview)
Yellow Jacket™ combines a phosphorus-rich reactive backbone with engineered char-formers. During combustion, the phosphorus moiety drives condensed-phase char formation while the secondary additive package promotes intumescence — together suppressing flame spread without the HCl evolution typical of chlorinated FRs.
Applications
- PIR boardstock for commercial roofing and wall insulation
- Closed-cell spray polyurethane foam (ccSPF)
- Rigid appliance and refrigeration foam
- Sandwich panels for cold storage
Sustainability profile
Halogen-free; lower-toxicity smoke profile; compatible with bio-based polyol blends including Honey Bee® soy chemistry.
Official Yellow Jacket™ brand site
The dedicated Yellow Jacket™ Additives brand site — product line-up, burn comparisons, and distributor information. yellowjacketadditives.com
Spec snapshot
Representative ranges, confirmed for your system during a formulation review.
| Form | Liquid (custom packaging) |
|---|---|
| Cure / use mode | Reactive — additive to polyol B-side |
| Shelf life | 12 months in original sealed container |
| Documentation | TDS & SDS available on request |