Vat Brown 81 is a premium vat dye designed for high performance on cellulosics and related substrates. Engineered for strong color yield, excellent wash and light fastness (when properly applied via reduction vatting) — ideal for apparel, home textiles, leather finishing and printing inks.
Vat Brown 81 is Dark brown powder. Insoluble in water and xylene (cold), slightly soluble in tetralin (hot) and xylene (hot).
It is greenish gray in concentrated sulfuric acid and produces brown precipitate after dilution.
It is yellowish brown in alkaline solution of Sodium sulfonate and dark olive in acidic solution.
Most commonly used in:
Dye Information | Dyeing Process Exhaust Dyeing Recommended | Light(Xenon) | Hypochlotite Bleaching | Peroxide washing 95ºC | Mercerizing | |||
C.I.No. | EX | OWF | 1/1 | 1/12 | CH | CH | CO | CH |
Brown 81 | IW | 0.5% | 6 | 7 | 4 | 4 | 4-5 | 4 |
Vat Brown 81 mainly used for the coloring of various plastics, such as polystyrene, polycarbonate, ABS resin, and cellulose acetate. It can also be used to color the original pulp of polyester fiber.
25KG/DRUM, CARTON BOX, BAG
Vat dyes are applied in reduced (leuco) form. Follow your standard vatting procedures and controls — our technical team can provide example vat recipes and lab protocols tailored to your process.
Vat Brown 81 is applied via conventional reduction vatting. Reduce the dye to leuco form using your usual reducing agent (e.g., sodium hydrosulfite) under controlled pH and temperature, allow uptake, then oxidize thoroughly. We provide example vat recipes and lab procedures on request.
Yes — we offer lab sample sizes starting from 250 g for trial dyeings and color matching. Contact sales with quantity and substrate so we can suggest the best milling form.
Typical sample lead time is 3–7 business days. MOQ for bulk varies by packaging and finish but is commonly 250 kg; smaller MOQs may be available for repeat customers—contact sales for details.
