Static headspace and GC/IR‐MS (capillary gas‐liquid chromatography, with an infrared detector and a mass spectrometer), were used to collect, separate, identify, and quantitate the volatile products in the EPG‐08 soyate sample, (esterified propoxylated glycerol, which is a model fat substitute compound with 8 moles of propylene oxide per mole of glycerol), EPG‐00 soyate (essentially trans‐esterified soybean oil with no added propylene oxide), and a 50:50 (v:v) mixture of the two oil samples. Each sample was heated at £192C for 12 h/day until the oil contained £20% triacylglycerol polymer. The EPG‐08 soyate samples were heated for 36 h, whereas the EPG‐00 soyate and the 50:50 mix samples were heated for 48 h. The major volatile decomposition products found included hexanal