Safety Reference
Danger
H314Causes severe skin burns and eye damage
H318Causes serious eye damage
Sourcing 1,5-NAPHTHALENEDISULFONIC ACID?
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Dye intermediate for azo dyes
Sourcing 1,5-NAPHTHALENEDISULFONIC ACID?
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1,5-Naphthalenedisulfonic acid, commonly known as Armstrong acid, is a fluorescent organic compound with the formula C₁₀H₆(SO₃H)₂. It is one of several isomers of naphthalenedisulfonic acid and is typically obtained as a colorless tetrahydrate solid.
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 1,5-NAPHTHALENEDISULFONIC ACID (CAS 81-04-9) is 2904.10.
2904.10
2904 10 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
naphthalene-1,5-disulfonic acid
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C1=CC2=C(C=CC=C2S(=O)(=O)O)C(=C1)S(=O)(=O)O