Posted on 15/09/2015 in News 32 2015
Zinc oxide synergist for PIN FR phenolic foams

PIN flame retardant high-solid phenolic foams were tested with 0 to 5% zinc oxide. The PIN FR foam contained 10% APP (ammonium polyphosphate, phosphorus – nitrogen FR) and 5% PER (penta erythritol, carbon source for char formation) and showed significantly improved fire performance (LOI – Limiting Oxygen Index, HRR – Heat Release Rate, THR – Total Heat Release, EHC – Effective Heat of Combustion) and also reduced toxic gas (carbon monoxide) production and yield (COP, COY) compared to non flame retarded foam.

Optimum zinc oxide load was c. 1%, resulting in reduced mean toxic gas release whilst not significantly deteriorating the foam physical properties (bending and compression strength).

“Effect of zinc oxide on properties of phenolic foams/halogen-free flame retardant system”, Journal of Applied Polymer Science, 2015, Y. Ma et al., 

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