Trade Name: REACTOBOND RED RB · CI Number: Reactive Red 198
Reactive Red 198 is a bright, wash-fast red reactive dye that is one of the most widely used reds in cotton dyeing. Its clean, high-strength red shade and excellent wash fastness make it a key component in trichromatic reactive dyeing systems for fashion and textile applications. Supplied by Yobai Industries as REACTOBOND RED RB.
The bifunctional chemistry of REACTOBOND RED RB — carrying two reactive groups capable of forming covalent bonds with cellulose — is the primary reason for its higher fixation efficiency and its position as the standard red in trichromatic reactive systems. A greater proportion of the applied dye forms the fibre-dye covalent bond rather than hydrolysing in the alkali bath, reducing effluent colour load and improving batch-to-batch reproducibility. It dyes at 60°C with standard NaCl and Na₂CO₃ auxiliaries, aligning with the exhaust conditions of compatible reactive yellows and blues in trichromatic recipes. Hot soaping at 95°C after fixation remains essential to remove residual hydrolysed dye and achieve the stated wash fastness.
Specifications are indicative. Contact us for a batch-specific TDS before placing a bulk order.
| Parameter | Value |
|---|---|
| Product Name | Reactive Red 198 |
| Trade Name | REACTOBOND RED RB |
| CI Number | Reactive Red 198 |
| CAS Number | Available on request |
| Colour | Bright Red |
| Appearance | Red Powder |
| Ionic Character | Anionic (sulphonate groups) |
| Solubility | Soluble in water. |
| Application pH | 10–11 (alkaline bath) |
| Application Temp. | 60°C |
| Required Auxiliaries | NaCl 60–80 g/L + Na₂CO₃ 15–20 g/L at 60°C; bifunctional type offers higher fixation with less unfixed dye |
| Dye Class | Bifunctional Reactive — Monoazo (two reactive groups) |
| Fixation Yield | 75–85% (exhaust, optimised conditions) |
| Exhaustion Rate | 70–80% at 60°C, NaCl 60–80 g/L |
| Wash Fastness | 4–5 |
| Light Fastness | 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 bifunctional design gives higher fixation yield than monofunctional VS-class reds, which improves batch reproducibility and lowers effluent colour load. Contact technical@yobaiindustries.in for application-specific support.
| Property | Value / Rating |
|---|---|
| Physical Form | Fine red powder |
| Bulk Density | Approx. 0.4–0.6 g/cm³ |
| Solubility in Water | Soluble; 50–80 g/L in warm water (40–50°C) |
| Dye Bath Stability | Stable at pH 7–11; hydrolyses rapidly above pH 12 |
| Wash Fastness (ISO 105-C06) | 4–5 |
| Light Fastness (ISO 105-B02) | 5 |
| Rubbing Fastness — Dry | 4–5 |
| Rubbing Fastness — Wet | 3–4 |
| Perspiration Fastness (Acid) | 4 |
| Perspiration Fastness (Alkaline) | 4 |
| Chlorine Fastness | 2–3 (avoid chlorine bleaching) |
| Solution Temp. Stability | Stable to 60°C at neutral pH |
Fastness ratings are on the standard 1–5 scale (5 = best). Values are achieved after proper hot soaping at 95°C post-dyeing. Batch-specific COA with fastness data available on request from technical@yobaiindustries.in.
REACTOBOND RED RB dissolves well in warm water — approximately 50–80 g/L at 40–50°C. Dissolving at 40–50°C is preferred, particularly for the medium and deep shades where higher dye concentrations are used. As a bifunctional reactive dye, it carries two reactive groups, and both must remain intact until fixation on the fibre — this means pre-dissolving in alkaline solution is particularly problematic for this grade and must be avoided.
Paste the powder in cold water, bring to 40–50°C with continuous stirring, and filter through a 100-mesh screen before adding to the bath. Add the dissolved dye stock to a neutral bath with the substrate present, introduce salt in staged doses, then add alkali in portions after salt exhaustion is underway. This sequence ensures the full bifunctional advantage — both reactive groups are available to bond at the point of fixation.
All values are for cotton exhaust dyeing at liquor ratio 1:10. Add NaCl in 2–3 stages before alkali addition. The bifunctional design gives higher fixation yield at all shade depths compared to monofunctional VS reds.
| Shade Depth | Dye (%owf) | NaCl (g/L) | Na₂CO₃ (g/L) | Temp (°C) | Time (min) |
|---|---|---|---|---|---|
| Light Red / Pink | 0.5–1.0% | 40–50 | 12 | 60 | 45 |
| Medium Red | 1.5–2.5% | 60–70 | 15 | 60 | 45–60 |
| Deep Red | 3–5% | 70–80 | 18–20 | 60 | 60 |
| Trichromatic Blend | 1–3% RR198 + partners | 60–80 | 15–20 | 60 | 45–60 |
Contact our technical team at technical@yobaiindustries.in for trichromatic recipe development and process support.
The swatches below represent typical application outcomes on 100% combed cotton under standard exhaust bath conditions. Actual shade depends on fibre quality, water hardness, and process variables. 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 →
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.