Sulphur Black: Cost & Color, 200% Strength Grade
200% strength sulphur black offering deep, blue-toned shades on cotton and blends. High color strength cuts dye use by 30–50%. Excellent uniformity, batch consistency, and low sulfides (<100 ppm). Suitable for exhaust, pad, and continuous processes. Lab samples available.
Description
Dyeing Performance
Colour strength directly affects cost: higher strength means deeper shades at lower dosage. Buyers prefer grades where equal concentration yields visibly darker dyeing. Uniformity is critical on cotton, viscose, and polyester-cotton blends – quality Sulphur Black deposits evenly without cloudiness or skitteriness. Reproducibility between batches depends on stable reduction potential and alkali control; premium products maintain ΔE below 1.0 across production lots.
Fiber Scope & Process Adaptability
Suitable fibers include pure cotton, viscose, linen, and polyester-cotton blends. Compatible processes: exhaust dyeing (most common), pad-dyeing, and continuous dyeing. The dye works well with reducing agents like sodium sulfide, sodium hydrosulfide, or glucose/caustic systems, and with alkalis such as caustic soda or soda ash. Proper compatibility ensures no precipitation or uneven uptake.
Stability & Storage
Powder forms are stable when dry but hygroscopic – moisture leads to oxidation, heat generation, even self-ignition. Liquid pre-reduced types are convenient but may stratify or develop odor over time. Shelf life: powders 1–2 years, liquids 6–12 months. Anti-caking agents prevent lumps in powder; stabilisers and suspending agents keep liquids homogeneous.
Environmental & Safety Features
High-quality low-sulfur grades contain less than 100 ppm residual sulfides, meeting Oeko-Tex standards. Wastewater contains sulfides and high COD – eco-friendly products support easy oxidation (air or hydrogen peroxide) to convert sulfides into sulfates. Some glucose-based systems eliminate sodium sulfide entirely, drastically reducing pollution burden.
Colour Appearance & Shade
- Blackness depth is paramount: premium Sulphur Black delivers true jet black, not grayish.
- Hue varies: blue-toned black looks brighter and deeper; brown-toned black (e.g. Sulphur Black BN) appears warmer.
- Intermixing with Sulphur Black 1 or BN is possible, but lab trials are essential because particle size and reduction speed differ.
Economic & Application Performance
Unit cost equals dye + chemicals + wastewater treatment per kg of fabric. High-strength grades reduce dye usage by 30–50% for the same depth, lowering total cost. Best value comes from optimal depth per total process expense, not cheapest per kilo. Modern Sulphur Black supports short-flow, energy-saving processes like one-bath reduction-clear or low-liquor-ratio (1:4–1:5) dyeing.
Packaging & Transport
Powders:
inner moisture-barrier PE bags plus woven outer bags or fibre drums, classified as flammable solids (UN 1350).
Liquids:
IBC totes, 200L plastic drums, or 25L jerrycans with corrosion-resistant liners. All shipments include MSDS .Reliable suppliers provide lab samples (50g powder or 250mL liquid) with recommended dyeing protocols for full verification before bulk orders.
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