Scotchmate is likely to be a mixture of various things to give the best compromise of flame retardant/non-toxic/usability properties.
According to a research paper (on the topic of environmentally safe retardants) these are the main classes...
Inorganics compounds
o Aluminium trihydroxide, ammonium polyphosphate, antimony trioxide.
Halogenated organic compounds
o Brominated and chlorinated compounds. These include chlorinated
paraffins, tetrabromobisphenol-A, decabromodiphenyl ether.
Organic phosphorous compounds
o Phosphate esters such as triphenyl phosphate, others combined with
halogen compounds.
Nitrogen based compounds
o Melamines
This is probably of very little help but there you go anyway!
Jay