Sulphur Blue BRN (Sulphur Blue 7)

1. Product Overview

Sulphur Blue BRN is a deep navy sulphur dye widely used for cotton dyeing, denim, and workwear.

• CI Name & No.: Sulphur Blue 7

• CAS No.: 1327-69-1

• Category: Sulphur dye

• Appearance: Dark blue powder / granules

• Key Features: Excellent build-up, economical dark shades, good fastness, cheaper alternative to vat dyes

• Markets: Strong demand in India, Africa, and Southeast Asia

2. Technical Specifications

3. Performance & Fastness

• Wash fastness: 4–5 (ISO 105-C10)

• Light fastness: 6 (ISO 105-B02)

• Rubbing fastness: Dry 4 / Wet 3–4 (ISO 105-X12)

• Chlorine bleach resistance: Moderate (better than direct dyes)

• Build-up: Excellent coverage, deep navy shades

   Recommended Dyeing Conditions

• pH: 11–12 (Na₂S/NaOH bath)

• Temperature: 80–95 °C

• Reducing agent: Sodium sulfide

• Post-treatment: Oxidation (H₂O₂ / Na₂Cr₂O₇) + soaping

4. Applications

• Cotton fabrics — yarn dyeing, woven & knitted fabrics

• Denim — widely used as an alternative to indigo

• Workwear & uniforms — durable navy shade for heavy-duty use

• Casual wear — shirts, trousers, jackets, fashion garments

• Textile blends — cotton/viscose, cotton/polyester, cotton/linen

  
  

5. Quality & Compliance

• COA provided for every batch (Shade, Strength, Moisture, Insolubles, pH)

• APEO-free, meets EU restricted azo dye requirements

• Heavy metals & formaldehyde controlled within international limits

• SDS available (English; other languages on request)

6. Packaging & Logistics

• Standard: 25 kg P.W. bag / carton / iron drum

• Bulk: 500–1000 kg jumbo bags available

• MOQ: 100 kg (trial order) / 1 MT (bulk)

• Delivery: 7–10 days from warehouse

• Shelf life: 24 months (dry, ventilated storage)

• Ports: Tianjin / Qingdao / Shanghai

7. Samples & Support

• Free samples (10–50 g) available

• Courier freight to be paid by customer (DHL/UPS account)

• Technical support: shade matching & process guidance

8. Related Products

• Sulphur Black BR (Sulphur Black 1) – deep black sulphur dye for cotton, denim, and workwear

• Vat Blue RSN (Vat Blue 4) - reddish-blue vat dye with excellent fastness for denim & uniforms

• Cationic Blue X-BL (Basic Blue 159) – bright blue basic dye for acrylic fibers and blends