Reactive Hot Brand Dyes By Parshwanath Dyestuff Ind.

Reactive Hot Brand Dyes having a low reactivity and low substantivity. Since these dyes have low reactivity, they requires more severe conditions for fixation with cellulosic materials. They are readily soluble by pouring water of 80A -85A C on powder & stirring well. They are applicable on cellulosic materials by both dyeing as well as printing methods.

In comparison with cold brand dyes, the 'H' brand dyes requires either a long steaming time or a high thermofixation temperature (with urea) for optimum fixation. H dyes of low to medium substantivity may lead to migration problem in dyeing prior to fixation.

When low concentration of highly substantive dyes are used, trailing becomes evident. trailing is avoided by selecting dyes of low or medium substantivity, using small padding troughs fed to constant level and operating at the highest running speed commensurate with the needs of the rest of the process.

These dyes contains very good fastness properties and suitable for printing cotton, viscose, cuprammonium rayons and natural silk.