Adding modacrylic to polyester fibers can increase the LOI* value to 31 and prevent the dripping of molten polyester fibers, which can cause injury and spread the fire. |
| Adding modacrylic to polypropylene fibers will also prevent melting and dripping. |
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* LOI (Limited Oxygen Index) represents the minimum oxygen concentration of an
O2 ÷ N2 gas mixture required to sustain combustion of a given material.
The materials with higher LOI values are more flame retardant. LOI is determined by ASTM D 2863-77 being express as:
(O2 ÷ (O2 + N2)) x 100 |