PIN flame retardants reduce heat and smoke release from PET-core / glass fibre / epoxy structural sandwich panels. Several phosphorus flame retardants were tested in the PET core of 15mm panels with glass fribre and DGEBA epoxy resin PIN flame retardants reduce heat and smoke release from PET-core / glass fibre / epoxy structural sandwich panels. coverings. The resin was tested with or without phosphorus FR (DEPAL) and the PET was tested with three PFRs (PSMP, DEPZn, DOP) and one halogenated FR (HFR). Lowest peak heat release rate with the best PFR (3% PSMP) and DEPAL resin was below half that with no flame retardant, and was lower than with HFR PET. Total smoke release was nearly 40% lower with the best PFR (2% PSMP) and DEPAL resin than with no flame retardants, whereas HFR resulted in nearly +20% more smoke production.
“Fire behavior of flame retarded sandwich structures containing PET foam cores and epoxy face sheets”, C. Bethke et al., Polymer Composites. 2020;1–14 https://doi.org/10.1002/pc.25786
DEPAL = aluminum diethyl phosphinate.
PSMP = pentaerythritol‐spirobis(methylphosphonate).
DEPZn = zinc diethyl phosphinate.
DOP = 6H‐dibenz[c,e] [1,2]oxaphosphorin,6‐[(1‐oxido‐2,6,7‐trioxa‐1‐phosphabicyclo[2.2.2]oct‐4‐yl)methoxy]‐, 6‐oxide.
HFR = 1,2‐bis(tetrabromophthalimido) ethane.