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Flame retardant mechanism of antimony trioxide

Antimony trioxide itself has no flame retardant function, however, when it is used together with halogenated compounds, the synergistic effect of the mixture creates the flame retardant properties.
Antimony trioxide reacts with halogenated compound and creates the chemical compounds, which generate the flame retardant function, through the following process.

1)Stop action of thermal de-composite chain reaction under gas phase (Radical trap effect)
2)Sealing action against oxygen under gas phase (Air sealing effect)
3)The formation of carbonaceous char under the solid phase (Air sealing and adiabatic effect)

The above reactions are considered to be as follow;

Examples of Antimony Trioxide Mixture

Type of Polymers Typical Data (phr) UL-94(1.6mm) LOI
PVC 100 phr
DINP 50 Sb2O3 3
V-0 30.4
PE 100 phr
TBA* 15 Sb2O3 5
V-2 26.3
PP 100 phr
DBDPO 20 Sb2O3 10
V-0 26.4
PS 100 phr
DBDPO 10 Sb2O3 10
V-0 27.4
ABS 100 phr
TBA* 24 Sb2O3 10
V-0 33.3
PBT 100 phr
TBA* 16 Sb2O3 7
V-0 27.8
PUR 100 phr
DBDPO 12 Sb2O3 3
V-0 30.7

*Br content, including 50-70% TBA derivative and Oligomer type

Above data is an example of measurements, but are not standards or warranties of performance.

 
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