Trade Name: DIRECT GREEN 2SD · CI Number: Direct Green 38
Direct Green 38 is one of the workhorses of the direct dye range — a practical, no-fuss green that has been in regular use across cotton, viscose, jute, and paper dyeing for decades. The chemistry is straightforward: the dye loads onto cellulose fibres through physical adsorption in a neutral hot salt bath, held in place by hydrogen bonding and van der Waals forces between the elongated dye molecule and the polymer chains of the fibre. No mordant, no alkali, no complicated pre-treatment beyond normal scouring — just salt, heat, and time.
For jute bags, canvas, and coarse cellulosic substrates where cost and process simplicity govern the decision, direct dyes are often the only practical option. Direct Green 38 fits those constraints cleanly. It builds a good green shade across a range of concentrations, and the hue can be adjusted towards olive or towards a brighter mid-green by combining it with a yellow or blue direct component in the same bath — the compatibility with other direct dye grades is reliable. Paper dyeing is a further major use. The dye goes directly into the beater or pulper at neutral pH; salt addition is reduced or eliminated at the papermaking stage, and the green produced on bleached stock is commercially acceptable for packaging and tissue applications. At Yobai Industries we supply it as DIRECT GREEN 2SD, tested for colour strength and shade consistency before every dispatch.
Specifications are indicative. Contact us for a batch-specific TDS before placing a bulk order.
| Parameter | Value |
|---|---|
| Product Name | Direct Green 38 |
| Trade Name | DIRECT GREEN 2SD |
| CI Number | Direct Green 38 |
| CAS Number | Available on request |
| Molecular Weight | approx. 890 g/mol |
| Dye Class | Disazo Direct (Cellulosic) |
| Colour | Green |
| Appearance | Dark Green Powder |
| Ionic Character | Anionic (sulphonate groups) |
| Solubility | Soluble in hot water (40–60°C); 20–40 g/L at 50°C |
| Application pH | Neutral (pH 7–9) |
| Application Temp. | 90–100°C (exhaust); 60–80°C (paper beater) |
| Required Auxiliaries | NaCl or Na₂SO₄ 10–30 g/L; neutral pH; no alkali required |
| Fixation Mechanism | Physical adsorption (H-bond + van der Waals) — not covalent |
| Wash Fastness | 3–4 (4 with cationic fixative after-treatment) |
| Light Fastness | 4 |
| Packaging | 1 kg · 5 kg · 10 kg · 25 kg · 50 kg · Custom packaging available |
| Shelf Life | 5 years from manufacture (cool, dry storage) |
| Manufacturer | Yobai Industries, Sayakha, Gujarat, India |
| GSTIN | GST Registered |
Need a full TDS, COA, or MSDS? Request it here or WhatsApp us directly.
Exhaustion rates are indicative and vary with machine type, liquor ratio, and water hardness. Contact Yobai Industries for process-specific support.
| Property | Value / Rating |
|---|---|
| Physical Form | Fine dark green powder |
| Bulk Density | Approx. 0.3–0.5 g/cm³ |
| Solubility in Water | 20–40 g/L at 50°C; increases with temperature |
| Dye Bath Stability | Stable at pH 6–9; avoid strongly acidic or alkaline conditions |
| Wash Fastness (ISO 105-C06) | 3–4 |
| Wash Fastness — After Cationic Fix | 4 |
| Light Fastness (ISO 105-B02) | 4 |
| Rubbing Fastness — Dry | 4 |
| Rubbing Fastness — Wet | 3 |
| Perspiration Fastness (Acid) | 3–4 |
| Perspiration Fastness (Alkaline) | 3–4 |
Fastness ratings on the standard 1–5 scale (5 = best). Values achieved after proper rinsing and optional cationic after-treatment. Batch-specific COA with fastness data available on request.
Direct Green 38 dissolves in hot water at 40–60°C, reaching 20–40 g/L depending on water hardness. Soft or demineralised water gives better dissolution. The dissolution process matters more for direct dyes than people sometimes assume — undissolved particles in the bath cause spotting that cannot be corrected without re-dyeing, especially on smooth viscose or fine cotton knit.
The right approach: make a cold-water paste first, then bring up to 50–60°C with continuous stirring until fully dissolved. Pass through a 100-mesh screen before adding to the exhaust bath. For paper applications, the dye can be dissolved at lower temperature (40–50°C) since paper processing temperatures are less demanding than exhaust dyeing.
All values are for cotton exhaust dyeing at liquor ratio 1:10–1:15. Add salt in 2–3 stages for level exhaustion.
| Shade Depth | Dye (%owf) | NaCl (g/L) | pH | Temp (°C) | Time (min) |
|---|---|---|---|---|---|
| Light (Pale Green) | 0.5–1.5% | 10–15 | 7–8 | 90 | 30 |
| Medium Green | 2–3% | 15–25 | 7–8 | 95 | 45 |
| Deep Green | 3–5% | 25–35 | 7–9 | 100 | 60 |
| Full (Bottle Green) | 5–8% | 35–50 | 7–9 | 100 | 75 |
Contact our technical team at technical@yobaiindustries.in for process optimisation specific to your machinery and water quality.
The shade builds from pale moss to bottle green depending on dye concentration and process parameters. Standard exhaust conditions on bleached cotton.
Actual shade depends on fibre preparation, water hardness, and after-treatment. Request a lab dip for colour-critical applications.
All packs are sealed in multi-layer moisture-proof bags. Custom packaging and private labelling available for bulk buyers.
All shipments include batch-specific COA. Export packing (UN-certified drums) available on request.
Below 25°C, dry store, RH below 60% — standard requirements for direct dyes. Moisture is the primary risk. An incompletely sealed bag left in a humid weighing room can absorb enough water to affect dissolution quality and colour strength — and there is no way to reverse moisture-induced degradation. Reseal immediately after every weighing, not at the end of the shift. Keep away from acids, oxidising agents, and chlorine-based bleaching compounds. Direct sunlight shifts the shade character over extended periods; covered storage only.
This dye is used by manufacturers across the following industries. Contact us with your specific application for a grade recommendation.
Yobai Industries carries the following grades in this dye family. Click any grade to view specifications, or view the full catalogue →
Don't see the grade you need? We carry 250+ dye grades. Contact us and we'll source or develop it for you.
MOQ 10 kg · Samples in 24 hours · Bulk in 7–15 days · Export worldwide · GST invoice with every order.