Acid Orange 33

Acid orange 33 is Soluble in water for gold orange, in ethanol has a solubility, orange for gold. The strong sulfuric acid in orange, diluted the same color. Its water solution with hydrochloric acid into orange; Add thick sodium hydroxide solution for yellow brown.

Acid orange 33 has a certain solubility in ethanol and is golden orange. It is orange in concentrated sulfuric acid, and the color is unchanged after dilution. Hydrochloric acid is added to orange in aqueous solution, and concentrated sodium hydroxide solution is turned into yellow brown.

TRADE NAME:

Acid Orange GS,Weak Acid Brilliant Orange,Kenamide Orange K2R,Lecotan Orange GL,Milling Brilliant Orange GS,Weak Acid Brilliant Orange GS

Key Features

Bright orange hue with high color intensity
Good solubility in water and acidic dye baths
Excellent leveling properties for uniform dyeing
Applicable to wool, silk, nylon, leather, and paper
Stable performance in ink and specialty coatings
Strong affinity for protein fibers

Application:

Mainly used for wool, silk and polyamide fiber dyeing and printing, also can be used for paper, hemp, sisal, leather and straw dyeing.

Acid Orange 33 Use condition:

‍1. Used for dyeing and printing wool, silk and nylon, also used for dyeing paper, hemp, sisal and straw.
2. Wool dyeing should be carried out in an acetic acid bath or a neutral bath. The pH value is above 3.5, and the dye uptake rate is not high; the silk should be dyed in a weakly acidic bath, and the color fastness is 1 grade lower than that of wool dyeing; Performed in a weakly acidic bath.
3. Blending of blended products: When the wool is dyed in the same bath as the various fibers, the nylon is also dyed. The apparent color of the silk is lighter than that of the wool, and the cellulose fibers are slightly stained.

Technical Specifications

‍CAS NO: 6507-77-3
CI.NO: 24780
Molecular Formula: C34H28N4Na2O8S2
Molecular Weight: 730.72
Shade:Red light orange‍

Acid Orange 33
Standard	Fiber	Soaping		Persperation Fastness	Oxygen bleaching	Light Fastness
		Fading	Stain
ISO	Wool	3-4	3-4	3	3	4-5

Application Features

Leveling(grade)

Displacement

Whitening

Solubility(g/L)

Metal ion effect(grade)

copper

iron

chromium

well

80(90℃)

—

Colour Fastness Test

Test Methods

fiber

Alkali resistance

Carbonization

potting

Chlorination discoloration

Alkali shrinkage

Acid shrinkage

Seawater discoloration

soaping

Perspiration

Sun exposure

discolor

Staining

ISO

wool

4~5

3~4

4~5

What materials can Acid Orange 33 dye effectively?

Acid Orange 33 is highly effective on protein-based fibers such as wool and silk, as well as synthetic fibers like nylon. It is also used for dyeing leather, paper, and for coloration in specialized ink formulations.

Does Acid Orange 33 provide good fastness properties?

Yes, Acid Orange 33 offers moderate to good lightfastness and wash fastness when applied correctly. Its affinity for protein fibers ensures long-lasting color stability, especially in textile and leather applications.

Can Acid Orange 33 be used in ink production?

Absolutely. Acid Orange 33 is commonly used in water-based and specialty ink formulations due to its bright shade, strong tinting strength, and good solubility. It helps achieve vibrant and consistent printing results.

What dyeing methods are suitable for Acid Orange 33?

This dye is best applied in acidic dye baths under controlled pH and temperature. It is compatible with exhaust dyeing, continuous dyeing, and printing methods, ensuring flexibility for textile and industrial applications.