Emission of gaseous components and heavy metals

There is not much data available on the effect that fillers have on what is emitted 

Decomposition of PA-6 and PA-66 produces NH3, H2O, CO, CO2, and hydrocarbons. The addition of magnesium hydroxide decreases the amounts of volatiles produced but the chemical components and their proportions are very similar to unfilled polymers. The addition of zeolites to polypropylene changes the mechanism of degradation depending on the zeolite type, its morphology, and dispersion but, in the investigation, the composition of the decomposition products was not determined.  

The rate of emission of CO and CO2 Ifom flexible PVC depends on the type of filler added.Additions of zinc borate to A1(OH)3 and Mg(OH)2 substantially reduced the emission of carbon monoxide. The presence of antimony oxide increased emissions of both CO and CO2. The data do not explain why the behavior is different. 

The addition of A1(OH)3, Mg(OH)2, MgO, and TiO2 to ethylene ethyl acrylate copolymer did not change the chemical components of the volatiles. The only observable difference was related to the concentration of ethylene (higher with A1(OH)3 than in the presence of the other fillers) and CO2 (lower with A1(OH)3 than with Mg(OH)2 and MgO). There was no detectable difference in the degradation 

A study of twelve silica fillers in rubber compounds showed that all of the fillers contributed to the formation of nitrosamines. There was a substantial difference in the amounts of nitrosamines detected in the presence of different fillers (from 1.1 xl 0 to 14.8x10 mol/kg) but this difference could not be correlated with properties such as their structure or surface area.  

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