J-Acid (6-Amino-1-Naphthol-3-Sulfonic Acid)
CAS Number: 87-02-5
J-Acid is a key naphthalene-based coupling component used in the synthesis of red, bordeaux, and violet azo dyes for textile, leather, and paper applications. Unlike H-Acid, it carries only one sulfonic acid group, giving it different coupling selectivity and enabling dyes with distinct hue profiles. Chemzip supplies high-purity J-Acid to dye manufacturers seeking consistent quality for specialty color formulations.
Technical Specifications
| appearance | Off-white to light brown powder |
| purity (%) | ≥95.0 |
| moisture (%) | ≤2.0 |
| melting point (°C) | ≥220 (decomp.) |
Applications
- Red and bordeaux azo dye synthesis for cotton
- Acid dye intermediate for wool in rose and red shades
- Direct dye coupling component for paper dyeing
- Leather dye intermediate for vegetable-tanned leather
- Reactive dye synthesis for polyamide substrates
Key Features
- Single sulfonic group provides unique hue differentiation from H-Acid
- Stable at ambient temperature with appropriate moisture-proof packaging
- Tested for heavy metals and restricted amines compliance
- Competitive pricing with long-term supply agreements available
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CAS Number
87-02-5
Category
Dye / Pigment IntermediatesAvailability
In StockSample
Dispatched within 5 days