Fast yellow G(CAS#2512-29-0)
Chemical Property:
| Molecular Formula | C17H16N4O4 |
| Molar Mass | 340.33 |
| Density | 1.30±0.1 g/cm3(Predicted) |
| Melting Point | >255°C (dec.) |
| Boling Point | 546.5±50.0 °C(Predicted) |
| Solubility | Chloroform (Slightly, Heated, Sonicated), DMSO (Very Slightly, Heated) |
| Vapor Presure | 0Pa at 25℃ |
| Appearance | neat |
| Color | Yellow to Dark Yellow |
| pKa | 8.80±0.59(Predicted) |
| Storage Condition | Amber Vial, -20°C Freezer |
| Stability | Light Sensitive |
| Refractive Index | 1.621 |
| Physical and Chemical Properties |
solubility: gold yellow in concentrated sulfuric acid, yellow precipitation after water dilution; No change in concentrated nitric acid; Red solution in concentrated hydrochloric acid; No change in dilute sodium hydroxide solution. hue or color: bright yellow relative density: 1.27-1.49 Bulk density/(lb/gal):10.6-12.4 melting point/℃:256-257 average particle size/μm:0.22-0.39 particle shape: rod-like body specific surface area/(m2/g):11-65 pH value/(10% slurry):4.0-7.39 oil absorption/(g/100g):28-80 hiding power: translucent diffraction curve:  reflection curve:  yellow easily dispersible powder, melting point 256 ℃, soluble in ethanol, acetone, etc. Machine solvent. Good sun and heat resistance, acid resistance, poor alkaline, not affected by the role of hydrogen sulfide. |
| Use | There are 93 varieties of this kind. The particle size of Hansha yellow G is different (8-30 m2/g), and the decrease of particle size can be more transparent and the green light is strong; The coloring intensity is improved, but the light resistance and solvent resistance are reduced. The coloration strength is lower than that of benzidine yellow pigment, with a standard depth (SD) of 11%-, and C.I. Pigment Yellow 14 need only 4%-6%; Excellent light fastness Grade 5, and C.I. Pigment Yellow 14 was only grade 3. Coarse particle size goods have good hiding power, used in paint, paint printing paste, rubber and cultural and educational goods; Solvent resistance and resistance to migration is poor, heat resistance is 140 ℃, not suitable for plastic coloring. It is mainly used for coloring of high-grade light-resistant ink, iron printing ink, plastic products, rubber and cultural and educational products, and can also be used for pigment printing and viscose |
| Risk Codes | 20/21/22 - Harmful by inhalation, in contact with skin and if swallowed. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. |
| WGK Germany | 3 |
Introduction
Lightfast yellow G, also known as methyl yellow, is an organic dye. The following is an introduction to the properties, uses, preparation methods and safety information of lightfast yellow G:- The chemical structure of lightfast yellow G is C17H13N3O3S. - Yellow powder in appearance. - It has low solubility in water, but good solubility in organic solvents such as alcohols and esters. - It has good lightfastness and heat-resistant properties. Uses:- Lightfast yellow G is mainly used as a dye and is widely used in textile, leather, plastic and other industries. - It can be used to dye fabrics and fiber materials to make them have better light resistance and are not easy to fade. - In some chemical analysis methods, XW G can also be used as an indicator or reagent. Preparation method:- The preparation method of light-resistant yellow G generally adopts the method of organic synthesis. - The specific preparation steps and reaction conditions can be designed according to the specific synthetic route, which generally involves nucleophilic substitution, condensation and other reactions. Safety Information:- Light Resistant Yellow G has not been reported to be toxic or dangerous. - However, as a chemical substance, it is necessary to pay attention to safety measures during use. - Avoid direct inhalation of the powder and avoid swallowing or contact with the skin and eyes. - Prolonged exposure can cause skin irritation, so take personal protective measures such as gloves and glasses. - In case of accidental contact or ingestion, seek medical attention immediately and provide a container or label for accurate diagnosis by the doctor.
Application
Fast Yellow G (Pigment Yellow 1, C.I. 11680, CAS 2512-29-0) is a bright greenish-yellow monoazo organic pigment with high tinctorial strength, excellent lightfastness (Grade 6–7), and good resistance to acids, alkalis, water, and oils. It is widely used in offset lithographic printing inks, water-based flexographic and gravure inks, and solvent-based packaging inks, where it delivers high color clarity, good transparency, and excellent rheology for high-speed printing. In coatings, this versatile pigment is formulated into waterborne and solventborne industrial paints, decorative coatings, and powder coatings, providing stable color and durability for outdoor applications. It is also suitable for coloring polyvinyl chloride (PVC) and other plastics via masterbatch, and is used in textile printing pastes, pigment printing on cellulosic fibers, stationery, and seed coating formulations. With good dispersibility and heat stability up to 160 °C, Fast Yellow G is a reliable, cost-effective yellow pigment. Xinchem offers custom synthesis, custom chemical synthesis, and contract manufacturing of high-purity Fast Yellow G to meet your specific colorant needs. Contact us for a competitive quote and reliable global supply.
