Direct Yellow 11

Direct Yellow 11 (Direct yellow R) also known as direct straw yellow and direct yellow 2G, has a uniform brown powder, which is red and yellow when dissolved in water, slightly soluble in fibrinin and insoluble in other organic solvents.In the case of concentrated hydrochloric acid in aqueous solution, concentrated hydrochloric acid was olive yellow, concentrated sodium hydroxide was gold orange precipitation, copper ion light was green, iron ion light was slightly dark yellow, zinc and ammonium ion light yellow.

TRADE NAME:

Direct Yellow R,Direct Yellow 2G,Curcumin S,Sun Yellow,Stilbene Yellow,Acid yellow 62,Pergasol Yellow 5R,Pergasol Yellow S

Key features

High tinting strength — produces vivid yellow shades at low dosage
Good wet-fastness — resistant to washing and perspiration on cellulosics
Reliable exhaustion in neutral-to-alkaline baths — predictable uptake
Fine particle size — disperses uniformly, minimizing specking
Compatible with standard leveling agents and optical brighteners
Suitable for exhaust dyeing, pad dyeing and paper coloration
Moderate lightfastness — suitable for interior textiles and paper goods
Available in powder or granulated forms for easy handling
pH stable in common dyeing ranges (pH 6–10) — minimal shade shift
Processing tip: improved leveling achieved with thin alkaline baths and controlled temperature ramp

Application of Direct Yellow 11:

It Most suitable for dyeing of viscose like cotton, flax, viscose rayon, acetate and jute, also for Ink, Leather and Paper coloration.

Use condition:

Direct Yellow 11 for dyeing cotton or viscose fabric have to red light yellow. The poor levelness and dye migration and dyeing times add salt to control the dyeing time points, to get a uniform color. After dyeing the dye bath should be natural cooling to 60 ~ 80 ℃, to facilitate the dye absorption. After dyeing by fixing agent can improve the fastness to wet processing.
It can also be used for dyeing silk and wool. When dyeing blended fabrics, the color of silk and wool should be compared Cotton and viscose fibers are much lighter, acrylic slightly stained, nylon, vinegar fiber, polyester color.
It is generally not used for cotton and viscose fabrics printing, not to mention ground color discharge printing.
4.It is mostly used for the dyeing of viscose silk and silk interwoven material, and the dyeing with soap soda bath can make the silk stay white.

Technical Specifications

‍CAS NO: 1325-37-7
CI.NO: 40000
EC Number: 215-393-6
Molecular Formula: C16H10N2Na2O7S2
Molecular Weight: 452.37
Shade: Reddish-yellow to reddish-brown powder or solid‍

Dyeing depth %	2
Insolubles %	0.15
Light Fastness	3-4
Washing Fatness	2-3
Rubbing fastness(dry)	4
Rubbing fastness(wet)	2-3

Colour Fastness Test

sun exposure

soaping

flooding

perspiration

rubbing

ironing

acidandalkaliresistant

standard depth

1/12

depth

originalcolorchange

white fiber stained

originalcolor change

whitefiber stanined

originalcolorchange

white fiber stained

dry

wet

Sulfuric

Acetate

soda ash

—

4~5

2~3

4~5

1~2

Precautions

Direct Yellow 11 has strong light brittleness.

How does Direct Yellow 11 perform in terms of fastness?

Direct Yellow 11 has moderate washing fastness and fair light fastness. Its performance can be improved by using after-treatment agents such as cationic fixatives to enhance wash resistance and reduce bleeding.

Can Direct Yellow 11 be used in printing applications?

Yes, Direct Yellow 11 is suitable for both dye bath dyeing and printing processes. It offers uniform color distribution and can be applied in continuous or batch printing methods.

Is Direct Yellow 11 suitable for blending with other dyes?

Direct Yellow 11 is often blended with other direct dyes to achieve a wide range of shades, especially when creating orange or green hues on cotton fabrics.

Does Direct Yellow 11 require special handling?

Direct Yellow 11 should be handled with standard safety precautions for azo dyes, including protective gloves and proper ventilation. Although it dissolves easily in water, dust exposure should be minimized during handling.