C.I. Fast Blue Base RR
C.I. Fast Blue Base RR is a sulfonamide fast color base used to produce brilliant blue shades in azo dyeing processes for cellulosic fibers. It diazotizes readily and couples efficiently with beta-naphthol for wash-fast colorations. Falls under HTS 2935.90.20.00 as specified fast color salt/base of sulfonamides.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If when formulated as reactive dye base for direct use
Reactive dyes containing sulfonamide groups classify as synthetic dyes in Chapter 32, not chemical intermediates.
If primarily a sulfonated hydrocarbon derivative without amide function
Simple sulfonated aromatics without nitrogen-function classify earlier in Chapter 29 subchapter I.
If for sugar-derived sulfonamide color bases
Sugar ethers/esters with sulfonamide groups fall under heading 2940/2942 per chapter note (c).
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Import Tips & Compliance
• Provide manufacturer's chemical structure data for Customs verification; store in cool, dry conditions to maintain diazotization capability; avoid bulk packaging over 25kg without stabilizers per safety transport note (f)
Related Products under HTS 2935.90.20.00
C.I. Fast Red Base B
C.I. Fast Red Base B is a sulfonamide-derived diazo component used in the production of azo dyes for textile coloration. It functions as a fast color base that couples with naphthol salts to produce vibrant, lightfast red shades on cotton fabrics. Classified under HTS 2935.90.20.00 as a fast color base within the sulfonamides category per Chapter 29 notes.
Fast Garnet GBC Base
Fast Garnet GBC Base is an arylsulfonamide diazo component producing scarlet shades when coupled with naphthols in ice dyeing. Widely used for medium-fast pigment colors on cotton and rayon. HTS 2935.90.20.00 classification applies to this sulfonamide fast color base.
C.I. Fast Scarlet Base R
C.I. Fast Scarlet Base R, a p-aminoacetanilide sulfonamide derivative, serves as fast color base for brilliant scarlet dyeings on cotton via naphthol coupling. Offers excellent light and chlorine fastness in ice colors. Specifically covered under HTS 2935.90.20.00 for sulfonamide fast color bases.
Fast Yellow GC Base
Fast Yellow GC Base is a meta-sulfonamide diazo component yielding bright yellow shades with naphthol AS coupling agents. Used in printing pastes for discharge styles. Classifies under HTS 2935.90.20.00 as sulfonamide fast color base.
C.I. Base Red GL
C.I. Base Red GL provides crimson shades through coupling with 2-naphthol-6-sulfonic acid in pigment printing. Sulfonamide structure ensures rapid diazotization. HTS 2935.90.20.00 for fast color salts/bases of sulfonamides.
Fast Bordeaux GP Base
Fast Bordeaux GP Base, an ortho-sulfonamide derivative, couples to give bordeaux shades with superior fastness properties. Used extensively in leather dyeing. Covered by HTS 2935.90.20.00 classification.