Direct Blue 106 (Direct fast blue) alias direct light blue FF2GL. The appearance is generally gray-black powder. Water-soluble is good, soluble in water is blue. When copper and iron ion color light turns green and dark. Has good resistance to reduction, Will not be broken down by the insurance powder and carved white powder.
TRADE NAME:Direct fast blue,Direct Brill Blue BL,Direct Brilliant Blue BL,Direct Fast Blue FF2GL,Direct Fast Sky Blue GD,Fast Blue BL,Intralite Brilliant Blue 2GLL,Permalite B rill Blue BL
Key features
- Type: Substantive/direct dye suitable for cellulose fibers (cotton, rayon/viscose).
- Shade: Deep, intense blue with good depth and easy shade-matching.
- Tinctorial strength: High — economical on weight of fiber (low % owf to obtain strong shades).
- Leveling: Good leveling performance in typical dye baths; suitable for both batch and continuous processes.
- Wet fastness: Good wash and wet rub fastness when used with appropriate after-treatments or fixers.
- Lightfastness: Moderate — acceptable for many interior textiles; test for outdoor or high-exposure end uses.
- Chemical compatibility: Compatible with common textile auxiliaries and levelling agents; may be blended with other direct dyes for shade adjustment.
- Application range: Works in exhaust, continuous pad-dye, and small-lot lab dyeing with typical bath temperatures from 60–95°C (see technical guidance).
- Storage & stability: Stable under normal storage conditions; keep dry and in original sealed packaging.
Technical Specifications
- CAS NO: 6527-70-4
- CI.NO: 51300
- Molecular Formula:C30H16Cl2N4Na2O8S2
- Molecular Weight: 741.49
- Shade: bright blue powder
| ensity | 1.31 |
| Dyeing Depth % | 2 |
| Light Fastness | 6-7 |
| Washing Fatness | 3-4 |
| Rubbing Fastness(dry) | 4-5 |
| Rubbing Fastness(wet) | 3 |
Application Features
Solubility(g/L) | SDC classification | displacement(grade) | metal ion effect(grade) | discharge property(grade) | other features |
| | | copper | iron | neutral | basic | |
20 | B | 3 | 3 | 3 | 1 | 1 | — |
Colour Fastness Test
sun exposure | soaping | flooding | perspiration | rubbing | ironing | acid and alkali resistant |
standard depth | 1/12 depth | original color change | white fiber stained | original color change | white fiber stained | original color change | white fiber stained | dry | wet | | sulfuric acid | acetic acid | soda ash |
7 | — | 2 | 2~3 | 2~3 | 1~2 | 4 | 1~2 | 4~5 | — | 5 | 1 | 4 | 5 |
Application:
Direct Blue 106 Mainly used for cotton, viscose, silk, polyamide fiber fabric dyeing and printing, also can be used for leather dyeing.
Use condition:
- 1. Directly endurance bright blue dyed cotton or viscose fiber has bright blue color. Poor transferability, it is advisable to add salt to control the dyeing to obtain uniform color. It is advisable to add Canadian dollar powder instead of salt. The dyeing rate is poor, and the dyeing solution should be naturally cooled to 80 °C after dyeing, which is beneficial to the dye exhaustion.
- 2. Direct fast blue is used for dyeing rich fiber, the dyeing rate is lower than that of dyeing cotton, and the color is also dim. It is also used for dyeing silk fabric, dyeing bath plus Yuanming powder and acetic acid; and for cotton and viscose fiber. Dyeing with silk silk fabric. When dyeing vinyl fabric, the dyeing rate is poor, and the color light is bluer than the viscose fiber. When cotton, viscose fiber and other fibers are dyed in the same bath, the silk color is similar to cotton and viscose fiber; wool The color depth is also similar, the color light is slightly reddish; the nylon dyed, polyester, acrylic, and diacetate fibers are slightly stained, and the three vinegar fibers are not stained.
- 3. Direct fast blue can be mixed with disperse dyes in high temperature dyeing and blending fabrics, and the color shade is basically unchanged. The dyeing bath is adjusted with ammonium sulfate to adjust the pH value, and the temperature is raised to 130 ° C under neutral conditions, or the body is boiled. After the dye is dyed with the disperse dye, the dye is continuously dyed for half an hour, so that the cellulose fiber is fully colored, and the dye is exhausted.
- 4. Direct fast blue can be used for direct printing of cotton or viscose fabric, and can also be used for other color printing.
- 5. Direct fast blue is mainly used for the dyeing of viscose fabrics, and also for the dyeing of cotton knitted fabrics. The strength of this product is low, the dyeing rate is poor, generally it is not suitable for dyeing dark colors, usually used in 3%~4 Between %(owf). The dyeing substance has obvious migration phenomenon in the wet state, and it is necessary to carry out post-processing in time to avoid causing various rickets.
FAQ
Which fibers give the best results with Direct Blue 106?
Cellulosic fibers (cotton, viscose/rayon) deliver the best depth and levelness. It is not recommended as a primary dye for hydrophobic fibers (e.g., polyester) without specific carriers or modifications.
How do I improve wash fastness for higher-performance garments?
Use optimized after-treatments: salt-free rinsing, mild oxidizing/soaping, and commercial after-fixing agents (crosslinkers or proprietary wash-fastness boosters) to raise practical wash fastness.
Can Direct Blue 106 be used for reactive printing or pad dyeing?
Yes — it can be adapted for direct printing and pad applications on cellulosics, but recipe adjustments (binders, thickeners, fixation steps) are required to secure fastness and print sharpness.
Are there special bath conditions to follow?
Maintain good dispersion and avoid extreme acidity. Typical dyebaths for direct dyes are neutral to slightly alkaline with thorough wetting and leveling practice; precise conditions depend on the process and auxiliaries used.
Storage and handling — any precautions?
Store in a cool, dry place in tightly closed containers. Avoid inhalation of dust; use basic PPE (mask, gloves, goggles) and follow local safety and waste-disposal regulations.
