The appearance of Vat Brown 1(VAT brown BR) is generally dark brown powder, insoluble in water and xylene (cold). It is slightly soluble in tetralin (heat) and xylene (heat), greenish gray in concentrated sulfuric acid, and brown precipitate after dilution.
TRADE NAME:Vat Navy Brown BR,Vat Brown BR,Vat Brown 2R,Cibanon Brown BR
Dyeing depth g/L | 30 |
Dyeing method | IW IK |
Leuco color | Brown(Y) |
Leveling property | ▲▲ |
Dead cotton | ▲ |
Light (Xenon test 1/12) | 7 |
Light (Xenon test 1/1) | 7-8 |
Light (Xenon test 2/1) | 7-8 |
Dyeing Method | Dyeing Tempreture(℃) | VAT Method | VAT Tempreture(℃) | Levelness | Others |
The most suitable method b, also can use c method | 40~50,The Highest 90 | 2/5000 | 40~50 | Good | — |
Sun fastness | Soping(95℃) | Perspiration | Rubbing | Ironing | Bleach resistant | Mercerizing | |||||||
Standard Depth | 1/12 Depth | Sample change | White stained | Sample change | White stained | Dry | Wet | immediately | After 4h | Chlorine bleaching | Oxygen bleaching | Sample change | White stained |
7~8 | 7 | 5 | 5 | 4~5 | 5 | 4~5 | 3~4 | 4~5 | 4~5 | 4~5 | 4~5 | 4 | 5 |
Vat Brown 1 Mainly used for cotton, hemp, silk and viscose dyeing and printing, cotton yarn dyeing common varieties. Used for polyester/cotton blended fabric two bath dyeing of polyester with little color. The leuco used for dyeing cotton knitwear.
Restore Vat Brown 1 should be stored in a dry and ventilated place sealed.
Vat Brown 1 is applied via the vat dyeing route: reduce the dye to its soluble leuco form in a reducing bath, pad or exhaust the fibre with the leuco solution, then oxidize the fibre to regenerate the insoluble dye. Final rinses and neutralization are required to remove residual chemicals and ensure fastness.
When correctly reduced, exhausted and re-oxidized, Vat Brown 1 normally delivers very good wash fastness and strong light fastness for everyday wear and many industrial uses. Final values depend on substrate quality, fixation practice and post-treatment.
Vat Brown 1 is formulated for cellulosics; it will not dye polyester in the same bath. For cotton/polyester blends use a dual system (vat for the cotton portion plus a disperse dyestuff or carrier process for polyester) or pre-treat/stripe the cotton portion separately.
Common industrial reducing agents such as sodium hydrosulfite (sodium dithionite) or modern alternative reducing systems are used to form the leuco; appropriate dispersing, wetting and sequestering agents help leveling and bath stability. Choose auxiliaries compatible with vat systems and follow supplier guidance for dosages to minimize shading variability.
Unevenness typically comes from incomplete reduction, poor wetting, local pH variations or oxidation conditions. Check liquor ratio, mixing, dispersing agent dosage and ensure controlled, uniform oxidation (air or chemical oxidant). A controlled pre-wet and gradual addition of the leuco solution reduces specking.
Handle reducing agents and dye powders with appropriate PPE (gloves, dust mask, eye protection). Control effluent from reduction/oxidation baths — neutralize residual reducing agents and remove suspended solids before discharge. Follow local regulations for chemical handling and disposal and consult the product SDS for detailed safety guidance.
When kept dry and sealed, Vat Brown 1 remains stable for typical industrial shelf lives (check supplier label). Avoid moisture and heat; store in original packaging and rotate stock by date to preserve performance.
Vat Brown 1 can be adapted for speciality printing systems that accept vat dyes, but printing recipes must control reduction/oxidation within the print paste and drying/steaming parameters. Consult technical support for optimized paste formulas and after-treatment steps for printing applications.
