Safety Reference
Danger
H317May cause an allergic skin reaction
H334May cause allergy or asthma symptoms or breathing difficulties if inhaled
H412
Sourcing Reactive Orange 4?
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Acid Yellow 220
acid dye for textiles
Sourcing Reactive Orange 4?
Post a free purchase request — no account needed. It reaches suppliers of this product, and replies go straight to your inbox.
Reactive Orange 4 is a textile reactive dye used for coloring cellulosic fibers. It features a complex azo structure with sulfonate groups that enable covalent bonding with the substrate.
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
The international HS code for Reactive Orange 4 (CAS 70616-90-9) is 2933.69.
2933.69
2933 69 80
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
trisodium;2-[[6-[(4,6-dichloro-1,3,5-triazin-2-yl)-methylamino]-1-hydroxy-3-sulfonatonaphthalen-2-yl]diazenyl]naphthalene-1,5-disulfonate
ARXWHYHTMGGNST-UHFFFAOYSA-K
CN(C1=CC2=CC(=C(C(=C2C=C1)O)N=NC3=C(C4=C(C=C3)C(=CC=C4)S(=O)(=O)[O-])S(=O)(=O)[O-])S(=O)(=O)[O-])C5=NC(=NC(=N5)Cl)Cl.[Na+].[Na+].[Na+]