Acid yellow 25 is Yellow powder, Soluble in water yellow, encounter cold becomes muddy. Slightly soluble in ethanol and acetone. Meet strong sulfuric acid is yellow, the generation after diluted fluorescent yellow precipitation. Its water solution meet sodium hydroxide solution without change. Mainly used for wool and polyamide fiber of printing and dyeing.
Acid yellow 25 dye is yellow in water, cold and turbid, and the solubility in water is 150g/L (90°C). It is slightly soluble in ethanol and acetone. It is yellow in concentrated sulfuric acid solution and has a fluorescent yellow precipitate after dilution. The aqueous solution did not change with sodium hydroxide.
TRADE NAME:Acid Yellow RN,Acid Yellow RPL,Acid Yellow E-2PL,Acid Yellow E-RPL,Weak Acid Yellow RN,Aminyl Yellow E-RL,Apollo Nylon Fast Yellow L-RPL,Dorasyn Yellow AGRL,Duramine Yellow RP,Egacid Yellow R,Nylosan Yellow E-RPL,Rifa Acid Fast Yellow E-RPL,Suminol Fast Yellow R
| Standard | Fiber | Soaping | Persperation Fastness | Oxygen bleaching | Light Fastness | |
| Fading | Stain | |||||
| AATCC | Wool | 4 | 4 | 3-4 | 1 | 6-7 |
| ISO | Wool | 2 | 4 | 3 | 1 | 5-6 |
Test Methods | fiber | Alkali resistance | Carbonization | potting | Chlorination discoloration | Oxygen bleaching | Alkali fluff | Acid fluff | soaping | Perspiration | Sun exposure | |||
discolor | Staining | discolor | Staining | discolor | Staining | |||||||||
AATCC | wool | 4 | 4~5 | 5 | 2 | 1 | 3~4 | 3~4 | — | — | 4 | 4 | 3~4 | 6~7 |
ISO | wool | 5 | 4~5 | 5 | 4~5 | 1 | 1 | 1 | 1 | 4~5 | 2 | 4 | 3 | 5~6 |
can be used for leather and electrochemical aluminum shading, occasionally used for paper coating.
Acid Yellow 25 is optimized for protein fibers (wool, silk) and polyamide (nylon). It gives the brightest, most reliable results on wool and nylon; polyester requires disperse dyes instead.
No mordant is required. Acid dyes like Acid Yellow 25 bind to positively charged sites on fibers under acidic conditions (pH 2–5), so acidification of the dyebath (acetic or formic acid) is the normal fixation method.
Typical exhaust dyeing: start at 30–40°C for leveling, acidify gradually, raise to 80–95°C and hold until exhaustion is complete. Exact concentration, liquor ratio and time depend on shade depth and fiber type — run a lab sample before full production.
Dosing depends on fabric weight and target shade. As a rule of thumb, perform a lab trial starting at 0.5–2.0% weight of goods (owg) and adjust. Because Acid Yellow 25 has high tinting strength, small changes in dosage produce noticeable shade shifts.
Yes — it mixes well with other acid dyes for shade modification. For predictable results, combine dyes with similar exhaustion and fastness properties and perform compatibility checks (lab dyeing and fastness tests) before production runs.
Expect moderate to good wet-fastness and rubbing fastness on properly scoured and acidified fibers. Fastness can be improved by optimizing fix temperature/time, using appropriate buffering, and post-treatment such as mild crosslinking resins where allowed by end-use requirements.
Handle with standard chemical PPE: gloves, eye protection and good ventilation to avoid dust inhalation. Avoid release to drains. Follow local regulations for disposal of dyebath effluent and consult the product SDS for detailed safety and first-aid measures.
Store in tightly closed containers in a cool, dry, well-ventilated place away from direct sunlight and strong oxidizers. Keep container tightly sealed when not in use to prevent moisture uptake and caking.
