non-flammable cloth

What is The Difference of Actual Function Between The Flame Retardant Fabric and The Non-Flammable Cloth?

1.Flame retardant fabric is the cloth will automatic extinguish even when it is burning but have the carbonization after leave the fire 12 seconds. According to the order of adding flame retardant materials, there are two kinds of the flame retardant cloth, pre-treatment and after-treatment.the regular after-treatment cloth is: 100% Cotton flame retardant fabric ,CVC flame retardant fabric, C/N88/12 Cotton Nylon flame retardant fabric. The Inherent fabric is aramid fabric and modacrylic fabric.