Inherently FR fabrics such as aramid fabric or modacrylic and cotton blend fabrics

which are made from synthetic fibers whose flame resistance is an essential characteristic

of the fiber chemistry. The flame-resistant property of these fabrics can not be removed

by wear or laundering. 

Fabrics that are treated with a flame retardant chemical to make them flame-resistant. The fibers

used in these fabrics, such as cotton, are not normally protective and become flame-resistant because

of the treatment.

Ammonia Cure and Heat Cure 

Cotton or Cotton blend fabrics are made flame-resistant by application of a flame retardant. This finish

can be either a phosphonium salt precondensate polymerized with gaseous ammonia (THPOH-NH3),

or a heat-cured dialkylphosphonamide. These processes bind the flame retardant to cotton fiber FR for

durability. Either process has little effect on fabric hand and performance.

Flame Retardant Mechanism of DROTEX Fabric

The Flame retardant fabric of DROTEX can be flame retardant by changing textile fiber degradation 

mechanism . The Drotex high-molecular polymer will break down into phosphoric acid during the fire, 

and the phosphoric acid will prompt fiber to dehydrate ,carbonize and form carbide layer. 

The carbide layer will stay in the original position to protect the user.

The DROTEX flame retardant agent will be permeated into the fabric fiber and become water-fast

high-molecular polymer after chemical reaction, thus this high-molecular polymer will be stored in the 

fabric fiber permanently. 

As shown in picture:

As the Drotex high-molecular polymer has formed a permanent connection inside the fabric, 

the fabric was given permanent flame retardant feature. 

As shown in picture:

From the picture we can see that the initial washing has made the char length longer, but the 

following washings is almost no effect of char length. This is because initial washing caused 

fabric attrition. Within the effective valid of the fabric, there is little change of the flame retardant property. 

Drotex flame retardant agent mainly made of phosphate compounds, even the high-molecular polymer is mainly made of phosphorus. No heavy metal or any other elements permeated into 

the fiber during its flame retardant producing. So Drotex fabric is absolutely safe and environmental 

and will not cause harm to human body and skin.