Direct Blue 108 is a bright direct (water-soluble) textile dye of the oxazine/triphenyl class commonly sold as a blue powder. It is mainly used for dyeing cotton, viscose (rayon), silk and blended fabrics and is marketed under trade names such as Direct Fast Blue FFRL / Remastral Blue FFRL.
TRADE NAME:
Direct Blue FFRL,Direct Fast Blue FFRL,Direct Fast Blue FFRL,Direct Light Blue FFRL,Leadirect Rasin Fast Blue FFRL,Orcolitefast Blue FFRL
Key features
- Appearance: bright blue powder / granular form suitable for bulk handling.
- Primary fiber compatibility: cotton, viscose (rayon), silk and their blends.
- Water solubility: limited/poor in some grades — usually supplied as a powder with dispersing characteristics; requires proper wetting and leveling aids for even exhaustion.
- Leveling & exhaustion: generally good leveling on cellulosic fibers when used with salt and alkali adjustments; optimized recipes improve evenness and depth.
- Fastness profile (typical industry ranges): light fastness often reported high (e.g., 5–7 scale depending on test), wash fastness moderate (commonly 3–4), rubbing fastness dry 4–5 / wet ~3.
- Common formats: powder for exhaust dyeing; sometimes supplied as liquid concentrates for continuous processes.
- Typical applications: garment and home-textile dyeing (not generally recommended for printing inks); also used in paper and leather dyeing in some formulations.
Direct Blue 108 Application:
It Used for cotton, viscose, silk and their blended fabric dyeing, general is not used for printing. Usually used for washing the less number of flocking fabric.
Technical Specifications
- CAS NO: 1324-58-9
- CI.NO: 51320
- Molecular Formula:C34H19Cl2N4Na3O11S3
- Molecular Weight: 895.61
- Shade: bright blue powder
| Density | 1.31 |
| Dyeing Depth % | 2 |
| Light Fastness | 6-7 |
| Washing Fatness | 3-4 |
| Rubbing Fastness(dry) | 4-5 |
| Rubbing Fastness(wet) | 3 |
How can I improve wash fastness of Direct Blue 108 on cotton?
Use a post-dye cationic fixing treatment (commercial fixing resin or cationic starch), rinse well, and consider mild after-soaping; lab trials will identify the optimal fixer and dosage.
Is Direct Blue 108 suitable for reactive dyeing or printing?
No — it’s a substantive (direct) dye formulated for exhaust dyeing. It’s generally not recommended for reactive chemistry or pigment printing pastes.
Which auxiliaries are compatible or should be avoided using Direct Blue 108?
Compatible: standard leveling agents, wetting agents and mild salts. Avoid strong reducing agents, very strong acids/alkalis and harsh surfactants that damage substantive binding.
