HE Series
High exhaust · 80–95°CCOTFIX HE Series is a twelve-shade bis-monochlorotriazine reactive-dye range for cellulosic fibres. Nuchem specifies exhaust dyeing at 80–95°C for this series, distinct from the lower-temperature positioning of ME. The published table provides individual solubility, rubbing, light, washing and dischargeability values. The temperature range describes the series application; it is not a complete process recipe or a guarantee of identical results for every shade.
Approval and conformance coverage varies by product and strength variant. Check product-specific evidence and request documents for your exact COTFIX grade; a series name is not a whole-range approval.
What shades and fastness data does COTFIX HE Series publish?
The COTFIX high-exhaust range lists twelve shades, each with solubility, rubbing, light and washing fastness published shade by shade. Nuchem reports solubility in grams per litre at 30°C and fastness on the standard grey scale, so a buyer reads one row for the grade in question. Yellow HE4G and Yellow HE6G are listed at 50 and 80 gpl, and most remaining rows sit at 80 or 100, with Blue HEGN 125% at 60. Dry rubbing fastness is 4-5 for most rows and 4 for Red HE3B, Red HE7B, Red HE8B and Navy Blue HE2R, while wet rubbing holds at 3-4 throughout. Nuchem publishes every value per shade.
| Dye | Shade 2% | Solubility gpl 30°C | Rubbing Fastness (Dry) | Rubbing Fastness (Wet) | Light Fastness 1/1 S/D | Washing Fastness (Shade) | Washing Fastness (Cotton) | Dischargeability |
|---|---|---|---|---|---|---|---|---|
| Cotfix Yellow HE4G | 50 | 4-5 | 3-4 | 4-5 | 4-5 | 4 | D | |
| Cotfix Yellow HE6G | 80 | 4-5 | 3-4 | 4-5 | 4-5 | 4 | D | |
| Cotfix G. Yellow HE4R | 80 | 4-5 | 3-4 | 5 | 4-5 | 4 | D | |
| Cotfix Orange HER | 80 | 4-5 | 3-4 | 3-4 | 4-5 | 4 | PD | |
| Cotfix Orange HE2R | 80 | 4-5 | 3-4 | 3-4 | 4-5 | 4 | PD | |
| Cotfix Red HE3B | 80 | 4 | 3-4 | 5 | 4-5 | 4 | ND | |
| Cotfix Red HE7B | 100 | 4 | 3-4 | 4-5 | 4-5 | 4 | ND | |
| Cotfix Red HE8B | 100 | 4 | 3-4 | 4-5 | 4-5 | 4 | ND | |
| Cotfix Navy Blue HER | 100 | 4-5 | 3-4 | 4 | 4-5 | 4 | ND | |
| Cotfix Navy Blue HE2R | 80 | 4 | 3-4 | 4 | 4-5 | 4 | ND | |
| Cotfix Blue HERD | 100 | 4-5 | 3-4 | 6 | 4-5 | 4 | ND | |
| Cotfix Blue HEGN 125% | 60 | 4-5 | 3-4 | 4-5 | 4-5 | 4 | ND |
D — Dischargeable · PD — Partially dischargeable · ND — Not dischargeable. Understand the table terms.
What are the characteristics of COTFIX HE Series?
The COTFIX high-exhaust range is built on bis-monochlorotriazine chemistry for high fixation by exhaust dyeing at 80–95°C. Complex molecular structures are tailored to maximise interaction with cellulose fibres, so the dye bonds covalently rather than sitting on the fibre surface. Nuchem positions the range for mills running batch exhaust machines on cotton, viscose and other cellulosic substrates. The published temperature window describes the series application range, not a complete recipe, dosing level or fixation percentage for a particular shade.
- High exhaustion and fixation efficiency
- Better build-up behaviour across the shade range
- Excellent reproducibility and shade consistency
- Suitable for yarn and fabric dyeing
Compare COTFIX ME for lower-temperature positioning and consider the deep-shade COTFIX D Series separately. Select a particular grade using the per-shade table values and the intended exhaust process. The temperature range alone is not a recipe, and a series name is not a whole-range approval. Nuchem manufactures at Sayakha, Bharuch and Vatva, Ahmedabad, and a mill should confirm the process for the chosen grade before a bulk run.
How is COTFIX HE Series consistency held, lot after lot?
Fastness figures are only worth as much as the reproducibility behind the published values. Nuchem describes a three-point quality check, laboratory support and production-lot records across four QC laboratories, so a listed grade repeats from lot to lot. Public checks support the same picture: 24 COTFIX colourants appeared in the official GOTS approved-input database when checked on 29 September 2026, and OEKO-TEX ECO PASSPORT certificate 21.0.64039 covers 55 COTFIX products with a recorded validity date of 30 June 2027.
Nuchem describes a three-point check before delivery. Review the published quality-control approach and discuss the applicable test records for a selected COTFIX high-exhaust grade.
QC labs at the Ahmedabad head office, the Ludhiana regional office, and both the Sayakha and Vatva factories support the routine checks.
Nuchem maintains production-lot records for traceability. A separate Gateway check on 28 September 2026 verified 34 active COTFIX products at Control Union Level 3, and a buyer can request the record for a selected grade and lot.
How does Nuchem treat wastewater from reactive-dye manufacture?
Nuchem's Sayakha plant at Bharuch runs as a 100% zero liquid discharge (ZLD) operation, so no liquid process effluent leaves the site. The published treatment train combines reverse osmosis, Mechanical Vapour Recompression (MVR) and an Agitated Thin Film Dryer (ATFD), and the Sayakha train is rated at 53 kilolitres per day (KLD). Condensate recovered through the train is recycled back into the manufacturing process, and dried sludge goes to Gujarat Pollution Control Board (GPCB) approved Treatment, Storage and Disposal Facility (TSDF) sites. The ZLD status and the 53 KLD capacity apply to the Sayakha plant only, not Vatva. Read the water-treatment explanation for the full detail.
For supply-chain review, keep the Sayakha site evidence separate from the approval and conformance documents for the exact chemical grade. Product approval does not certify a factory's water-treatment performance. Nuchem manufactures at Unit 1, Sayakha (Bharuch) and Unit 2, Vatva (Ahmedabad), with in-house laboratories at both factories and offices in Ahmedabad and Ludhiana.
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