Direct Yellow 44

Direct Yellow 44 is a water-soluble direct (azo) dye with a bright yellow shade and good substantive affinity for cellulosic fibers. It is supplied as a free-flowing powder and is commonly used for exhaust dyeing and direct printing of cotton, viscose and other cellulosic blends; it is also used in leather, paper and ink formulations.

TRADE NAME:Direct Yellow L4G,Direct Fast Yellow GC,Solophenyl Yellow 5GL

Main Features

• Type: Direct (azo) dye, water-soluble powder.
• Shade: Bright yellow with warm undertone, good hiding on cellulosics.
• Fiber affinity: Excellent for cotton and viscose; also used on blends, silk, nylon (with auxiliaries).
• Fastness: Generally good lightfastness (typical ratings 4–5) and moderate washing fastness (typical ratings 2–4 depending on recipe).
• Solubility: Readily soluble in hot water; low solubility in most organic solvents.
• Chemical class: Azo/di-azo direct dye (sulfonated, disodium salt form for water solubility).
• Typical uses: Exhaust dyeing, direct printing, inks, paper coloration and leather dyeing.
• Formulation notes: Performs best with leveling agents and after-treatment (soaping/fixing) to improve washfastness.
• Handling & safety: Follow SDS for dust control, eye/skin protection and wastewater treatment guidance.

Application:

Direct Yellow 44 Most suitable for dyeing of viscose like cotton, flax, viscose rayon, acetate and jute, also for Ink, Leather and Paper coloration.

Technical Specifications

• ‍CAS NO: 8005-52-5
• CI.NO: 29000
• Molecular Formula: C27H20N6Na2O8S
• Molecular Weight: 634.53
• Shade: yellow. brown powder.‍

FAQ

What fibers accept Direct Yellow 44 best?

Direct Yellow 44 is engineered for cellulosic fibers—cotton and viscose show the best shade depth and leveling. With appropriate auxiliaries and dyeing conditions it can also be used on certain polyamide and blended fabrics, and in paper or leather applications.

How do I improve washfastness when dyeing with Direct Yellow 44?

Improve washfastness by optimizing dye liquor pH and temperature, adding a low level of salt (for leveling) followed by a hot soaping/after-treatment step, and using fixation or cationic fixing agents where permitted. Mechanical and chemical after-treatments reduce migration and bleeding.

What typical fastness ratings should I expect?

Typical vendor TDS reports lightfastness around 4–5 (good) and washing fastness usually between 2–4 depending on substrate and post-treatments. Always run lab trials on the exact substrate and recipe before production runs.

Is Direct Yellow 44 safe to handle in the factory?

As with most powdered dyes, avoid inhalation and dust dispersion. Use standard PPE (gloves, goggles, dust mask/ventilation). Consult the product SDS for specific hazard statements, exposure limits and wastewater disposal instructions.

Which auxiliaries or recipe tips give the best leveling?

Non-ionic leveling agents and small additions of wetting agents improve uniformity. Controlled addition of electrolyte (salt) and gradual temperature rise help achieve even exhaustion; perform sample trials to set exact dosages.

Can Direct Yellow 44 be used in ink or paper formulations?

Yes — its water solubility and shade stability make it suitable for certain aqueous ink and paper coloration uses. Check pigment/dye compatibility, binder chemistry and migration requirements for the end use.