K Acid 70% (CAS 118-03-6) – High-Quality Naphthalene Dye Intermediate

K Acid 70%, full chemical name 2-Amino-3,6,8-naphthalenetrisulfonic acid, CAS No.118-03-6, is a fundamental naphthalene-series sulfonic acid dye intermediate widely applied for azo dyes, acid dyes and reactive colorants. The 70% standard industrial grade balances stable coupling activity and cost efficiency, making it the mainstream raw material for global dye factories.
We are a direct Chinese fine chemical manufacturer specialized in dye intermediates, with independent production, purification, quality control and environmental treatment lines. Our self-produced K Acid 70% features low impurity content, stable amino value and consistent batch performance, fully meeting mass synthesis demands for textile dyestuff, leather colorants and pigment manufacturers worldwide.

 1. Product Basic Introduction

 2. Full Technical Specifications (Industrial Standard TDS Sheet)

3.1 Acid Dyes for Textile Industry K Acid 70% is the key coupling component for manufacturing acid red, acid bordeaux and acid violet dyes. These finished colorants are widely used for dyeing wool, silk, nylon and polyamide fabrics, delivering bright shade and excellent light fastness.

3.2 Reactive & Azo Dye Production It serves as critical intermediate for various water-soluble azo reactive dyes applied to cotton, viscose fiber printing and dyeing. Its trisulfonic acid structure improves dye water solubility and fiber fixation rate.

3.3 Leather & Paper Colorants Used to synthesize metal complex dyes and leather mordant dyes, providing uniform staining for cowhide, sheepskin and industrial paper coloring with stable color fastness to washing and friction.

3.4 Derivative Intermediate Synthesis Raw material for producing secondary dye intermediates such as 2R acid, supporting custom derivative synthesis for high-end specialty dyestuff manufacturers.

Standard Export Packaging – Mass bulk order: 25kg woven bag with double PE inner liner

Large volume shipment: 500kg / 1000kg jumbo bulk bag

Lab test sample: 1kg / 5kg vacuum plastic packaging for formulation trials

Storage Requirements Seal packages tightly, store in cool, dry and well-ventilated warehouse with temperature below 30℃; isolate from strong oxidants, strong alkalis and food raw materials; avoid long-term direct sunlight. Shelf life reaches 24 months under qualified sealed storage.

Shipping Regulation Classified as general industrial solid chemical; we provide complete customs clearance files including SDS, COA, packing list and commercial invoice for cross-border shipment. We cooperate with professional chemical freight providers for safe global delivery.

Q1: What is the main application of K Acid 70% CAS 118-03-6?

A1: It is a classic naphthalene-series dye intermediate, mainly used to synthesize acid dyes, reactive azo dyes and leather metal complex colorants for textile, leather and paper printing industries. It can also be processed into derivative intermediate 2R acid.

Q2: Why choose our factory’s 70% grade K Acid instead of higher concentration?

A2: 70% amino value grade is the most cost-effective specification for most dye coupling formulas. Our production process strictly controls impurity salts and water insoluble substances, avoiding dye precipitation, color spots and low fixation rate issues in finished dyestuffs.

Q3: Can you supply small test samples for dye formulation testing?

A3: Yes, we provide 1kg–5kg lab samples for qualified dye manufacturers and chemical formulators. Clients only bear international freight cost, and complete COA, TDS and SDS documents will be delivered together with samples.

Q4: How does your factory realize green production of K Acid?

A4: Our 30-person R&D team cooperates with universities to optimize sulfonation and purification synthesis routes, cutting solvent waste generation. We also build professional wastewater and solid waste recycling treatment systems to meet international industrial environmental compliance standards.

Q5: What quality documents can you provide for import customs and production inspection?

A5: Each batch shipment includes Certificate of Analysis (COA), Technical Data Sheet (TDS), Safety Data Sheet (SDS), commercial invoice and packing list. Third-party independent lab test reports can be issued upon client request.

Q6: What is your monthly stable production capacity of K Acid 70%?

A6: Our dedicated naphthalene intermediate production line maintains continuous stable mass output to fulfill large bulk orders, and we arrange priority expedited production for urgent dye factory batch demands. Contact our sales team to get detailed capacity and delivery lead time information.