Trade Name: REACTOBOND RED M5B · CI Number: Reactive Red 2
Reactive Red 2 is a DCT (cold brand) reactive dye that produces red shades on cotton at room temperature, making it suitable for cold pad-batch and continuous dyeing processes. It is widely used in energy-efficient dyeing operations. Supplied by Yobai Industries as REACTOBOND RED M5B.
In cold pad-batch operations, REACTOBOND RED M5B is padded with sodium hydroxide and sodium silicate through the fabric, the rolls are sealed in polythene film and rotated slowly at room temperature for 8–16 hours while the dye-cellulose reaction proceeds. The working dye-alkali solution has a limited pot life and should be prepared fresh — typically at the start of each shift. No salt is required. Cold-water rinsing followed by hot soaping at 95°C removes unfixed hydrolysed dye and develops final wash fastness equivalent to hot-exhaust reactive grades. Uniform padding nip pressure and consistent roll take-up tension are the principal process variables controlling shade reproducibility in pad-batch.
Specifications are indicative. Contact us for a batch-specific TDS before placing a bulk order.
| Parameter | Value |
|---|---|
| Product Name | Reactive Red 2 |
| Trade Name | REACTOBOND RED M5B |
| CI Number | Reactive Red 2 |
| CAS Number | Available on request |
| Colour | Red |
| Appearance | Red Powder |
| Ionic Character | Anionic (sulphonate groups) |
| Solubility | Soluble in cold water. |
| Application pH | 10–12 (cold pad-batch) |
| Application Temp. | 20–25°C (cold brand process) |
| Required Auxiliaries | NaOH 20–25 g/L + sodium silicate 100 g/L (cold pad-batch); high alkali, low temperature process |
| Dye Class | DCT (Dichlorotriazine) Cold Brand Reactive |
| Fixation Yield | 60–75% (cold pad-batch, optimised batching conditions) |
| Pot Life (working solution) | 4–8 hours (prepare fresh each shift) |
| Wash Fastness | 4 |
| Light Fastness | 4–5 |
| 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.
The DCT reactive group has a short pot life in alkaline solution — always prepare the pad liquor fresh at the start of each shift. Contact technical@yobaiindustries.in for process-specific guidance.
| Property | Value / Rating |
|---|---|
| Physical Form | Fine red powder |
| Bulk Density | Approx. 0.4–0.6 g/cm³ |
| Solubility in Water | Good at room temperature; 40–60 g/L in cold water |
| Dye Bath Stability | Limited in alkaline solution — pot life 4–8 hours; stable as dry powder |
| Wash Fastness (ISO 105-C06) | 4 |
| Light Fastness (ISO 105-B02) | 4–5 |
| Rubbing Fastness — Dry | 4 |
| Rubbing Fastness — Wet | 3–4 |
| Perspiration Fastness (Acid) | 4 |
| Perspiration Fastness (Alkaline) | 3–4 |
| Chlorine Fastness | 2–3 (avoid chlorine bleaching) |
| Solution Temp. Stability | Stable as dry powder; do not heat alkaline working solution |
Fastness ratings are on the standard 1–5 scale (5 = best). Values are achieved after proper cold rinse + hot soaping at 95°C post-batching. Batch COA available from technical@yobaiindustries.in.
REACTOBOND RED M5B dissolves readily in cold or lukewarm water — approximately 40–60 g/L at room temperature — which suits cold pad-batch where the process runs entirely at ambient temperature. Complete dissolution before the dye is added to the pad trough is important; undissolved particles at the nip cause spots that are particularly visible in red shades on pale or printed grounds.
Dissolve the dye in plain, slightly warm water first, then prepare the alkali (NaOH + sodium silicate) separately. Combine in the pad trough at the required ratio immediately before use — do not pre-mix and store. Once the dye and alkali are combined, the working solution should be used within 4–8 hours. The DCT reactive group starts hydrolysing in alkaline conditions over time, and aged solution produces pale, unlevel shade with poor wash fastness regardless of batch time.
All values are for cold pad-batch on cotton. Wet pick-up: 70–80%. Batch at 20–25°C in sealed polythene film with slow roll rotation throughout the batching period.
| Shade Depth | Dye (g/L) | NaOH (g/L) | Na₂SiO₃ (g/L) | Temp (°C) | Batch Time (h) |
|---|---|---|---|---|---|
| Light Red / Pink | 10–20 | 20 | 80–100 | 20–25 | 8–12 |
| Medium Red | 30–50 | 20–22 | 100 | 20–25 | 10–14 |
| Dark Red | 60–80 | 22–25 | 100–120 | 20–25 | 12–16 |
| Deep / Ruby | 80–100 | 25 | 120 | 20–25 | 14–20 |
Contact our technical team at technical@yobaiindustries.in for process development and pad-batch optimisation support.
The swatches below represent typical application outcomes on 100% combed cotton at 20–25°C pad-batch conditions. Actual shade depends on fibre quality, pad expression, and batch duration. Request a sample dyed swatch before committing to bulk production.
Request a shade card or sample dyed swatch from technical@yobaiindustries.in to verify shade match before production.
Store in a cool, dry location below 25°C. Reactive dyes are sensitive to moisture and elevated temperatures — keep containers sealed at all times. Avoid storage near acidic materials. Protect from direct sunlight.
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 →
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MOQ 10 kg · Samples in 24 hours · Bulk in 7–15 days · Export worldwide · GST invoice with every order.