Acid Red 172

Acid Red 172 is a water-soluble anionic dye formulated for acidic dyeing processes. It produces vivid, transparent red shades with strong tinting strength and good compatibility across protein and polyamide fibers. Designed for industrial textile and leather applications, Acid Red 172 offers reliable batch reproducibility and predictable leveling when used under recommended acidic conditions.

TRADE NAME:

Weak Acid Brilliant Red 3B,Brilliant Red 2B,Weak acid red 3B

Key features

Type: water-soluble acid dye (anionic)
Shade: bright to deep red with good chroma and transparency
Tinting strength: high — economical dosage for deep shades
Fiber affinity: excellent for wool, silk, nylon and other protein/polyamide substrates
Application: suitable for exhaust dyeing, continuous pad-batch and leather dyeing
Leveling: good leveling behavior on gradual uptake fibers when dye bath is controlled
pH behavior: optimal uptake under acidic conditions (acidified dyebaths)
Fastness profile: moderate to good wet fastness and general washing performance when properly fixed; lightfastness varies with shade depth and substrate
Compatibility: blends well with common acid dye auxiliaries and acid levellers; compatibility with cationic pre-treatments improves on difficult substrates
Handling & storage: stable in dry form; store in cool, dry place away from direct sunlight

Application of Acid Red 172:

Mainly used for wool, silk and polyamide fiber fabric dyeing and printing, can discharge, also can be used to color film.

Technical Specifications

‍CAS NO: 6826-53-5
CI.NO: 18135
Molecular Formula:C30H22ClN3Na2O10S3
Molecular Weight:762.14
Shade:Blue-ray red‍

Standard	Fiber	Soaping		Persperation Fastness	Oxygen bleaching	Light Fastness
Standard	Fiber	Fading	Stain	Persperation Fastness	Oxygen bleaching	Light Fastness
AATCC	Wool	4-5		4-5	4	5
ISO	Wool	4-5		4-5	5	4-5

Colour Fastness Test

Test Methods	fiber	Alkali resistance	Carbonization	Chlorination discoloration	Oxygen bleaching	Alkali shrinkage	Acid shrinkage	Seawater discoloration	Soaping discoloration	Perspiration	Sun exposure
AATCC	wool	4	5	—	4	3	3	4~5	4~5	4~5	5
ISO	wool	3	5	5	5	4	4	4~5	4~5	4~5	4~5

packaging

20 or 25kg/compound bag, carton box, iron drum, fiber durm for powder dye and 1000kg/tank for liquid dye.

What substrates is Acid Red 172 best suited for?

Acid Red 172 shows highest affinity for protein fibers (wool, silk) and polyamide (nylon). It can be used on blends when the protein/polyamide fraction is substantial; for pure cellulosic substrates, pre-mordanting or different dye classes are recommended.

Is Acid Red 172 compatible with common auxiliaries and other dyes?

Yes — it blends well with standard acid dye auxiliaries (levellers, wetting agents, pH buffers) and can be mixed with other acid dyes for shade tuning. Avoid mixing with strongly cationic products that may alter exhaustion behavior unless the process is specifically designed for cationized substrates.

Can Acid Red 172 be used for leather dyeing and what adjustments are needed?

Yes — Acid Red 172 is suitable for leather; application method and pH control are critical. Leather dyeing often requires lower liquor ratios and specific penetration control; small pilot trials should define the right dyebath composition and post-fatliquoring steps to preserve hand feel.