Product name: L acid. 

Other name:5-hydroxynaphthalene-1-sulphonic acid;

1-Naphthol-5-sulfonic Acid; 5-hydroxynaphthalene-1-sulfonic acid

Molecular structure:

Specifications:

1.Appearance: Grey-white powder

2.Coupling value:80.0%min.

3.Purity by HPLC:98.0%min.

4.Insoluble material:0.1%max.

Packing: in net 25kgs (as is basis) bag