Import Direct Black 19 — Buy in Bulk from Supplier in China

Direct black 19 is a water-soluble direct dye with the CAS number 6428-31-5 and molecular formula C34H27N13Na2O7S2, supplied as a fine black powder. It has a stated strength rating of 200%, indicating it is formulated for high-intensity dyeing where lower quantities achieve deep coloration. The product is designed for industrial use in textiles, leather, and paper, where consistent black tones are required without the need for mordants or after-treatments.

The dye is classified as a diazo-based azo compound, typical of direct black dyes used in cellulose-based substrates. Its particle size allows for easy dispersion in aqueous solutions, reducing the risk of sedimentation during batch preparation. While the listing does not specify pH tolerance or dyeing temperature, standard industry practice for this class of dye operates between 60°C and 90°C, with salt-assisted exhaustion. No certification claims are verified, but the formulation aligns with typical industrial dye stability requirements.

Buyers in textile finishing, leather tanning, and specialty paper manufacturing commonly source this dye for batch dyeing operations requiring high washfastness. The dye is typically packaged in 25kg multi-wall paper bags with inner polyethylene lining. Trade terms mentioned include FOB and CIF, but exact MOQ and lead time are not confirmed. Buyers should request test reports for lightfastness and wet rub resistance before large-scale adoption.

Tianjin Shenyuan Chemical Co., Ltd is an imported supplier based at 203 Room203, Tianjin Chentang Technology No.17 Yujiang Road, Hexi District, Tianjin 300220, China. The listing confirms the supplier's physical address and tier classification as imported, with harbor-level trust signals. No information is provided regarding years in operation, workforce size, production capacity, or client references.

The company is not described as a manufacturer, distributor, or trader in the source data. It is listed as a supplier of Direct black 19 with no additional details on quality control processes, laboratory facilities, or export history. Buyers should verify its role in the supply chain directly, as no certifications, audits, or production capabilities are stated.