C10H8O6S2
288.3 g/mol
Dye & PigmentDanger
1,5-NAPHTHALENEDISULFONIC ACID
CAS81-04-9EC201-317-9
Category
Dye & Pigment
Compound Class
Organic Acid
Primary Use
Dye intermediate
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.
Dye intermediate
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.
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Related Compounds
StrongSame Parent
1,5-Naphthalenedisulfonic acid tetrahydrate
CAS211366-30-2
intermediate for dyes and pigments
SimilarStructure SimilarSimilarity 0.78
1-Naphthol-5-sulfonic acid
CAS117-59-9
Dye intermediate for azo dyes
SimilarStructure SimilarSimilarity 0.75
1-naphthylamine-5-sulfonic acid
CAS84-89-9
dye intermediate
ApplicationSame Use
Dichlorosulfophenyl-3-methylpyrazolone
CAS84-57-1
Dye intermediate
ApplicationSame Use
2,4-Dimethylaniline-6-sulfonic acid
CAS88-22-2
Dye intermediate
ApplicationSame Use
4-Amino-2,5-dichlorobenzenesulfonic acid
CAS88-50-6
Dye intermediate
ApplicationSame Use
N,N-diethyl-m-aminophenol
CAS91-68-9
Dye intermediate
ReferenceSame Category
4,4′-diamino-2,2′-stilbenedisulfonic acid
CAS81-11-8
Chemical intermediate for dyes and fluorescent brighteners
Safety Reference
Danger
H314Causes severe skin burns and eye damage
H318Causes serious eye damage
Customs Tariff Classification
The international HS code for 1,5-NAPHTHALENEDISULFONIC ACID (CAS 81-04-9) is 2904.10.
HS code (international, 6-digit)
2904.10
EU CN code (8-digit)
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.
Identifiers
IUPAC Name
naphthalene-1,5-disulfonic acid
InChIKey
XTEGVFVZDVNBPF-UHFFFAOYSA-N
SMILES
C1=CC2=C(C=CC=C2S(=O)(=O)O)C(=C1)S(=O)(=O)O
Synonyms (12)
- HEXETIDINE IMPURITY D [ EP IMPURITUY]
- Hexetidine EP Impurity D
- Armstrong's S acid
- Armstrong's acid
- NAPADISYLIC ACID
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