Is it a modacrylic fibre?

A Survey on the Microscopical and Chemical Analysis of Synthetic Wig Fibers

“…Cross-sectional shape, however, has been observed in the past and current study to be a variable feature both within and between wigs which aids in the wig's characterization. The fiber's shape is a result of one of three factors: engineering for a specific end use, an attribute in the manufacturing process, or accidental causes such as crushing [3]. Certain cross-sectional shapes that are difficult to make, and thus expensive, have been patented by various manufacturers [3].…”

“…Acrylic fibers, by definition, contain over 85% acrylonitrile units, while modacrylic fibers must contain between 35% and 85% of these units [3]. The greater the number of acrylonitrile units, the greater the strength of the fiber.…”

“…The co-monomer enhances the fiber's susceptibility to dyes and increases flame resistance. Vinyl chloride and vinylidene chloride are the most commonly encountered co-monomers [3].…”

“…Solvents currently being used by manufacturers include nitric acid, acetone, dimethylformamide, and dimethylacetamide [3]. The fibers are later dyed and delustered to mimic the appearance of natural hair [2].…”

“…The fibers are later dyed and delustered to mimic the appearance of natural hair [2]. Sodium styrene sulphonate, sodium p-sulphophenylmethallylether, and the sodium salts of methallylsulphonic acid and p-methallyloxybenzenesulphonic acid are all compounds used to provide dye sites [3]. The dyed fibers are then measured and cut.…”