Chemical Database

2,7-Naphthalenedisulfonic acid, 3,3'-((4,4'-biphenylylene) bis(azo)) bis(5-amino-4-hydroxy-, tetrasodium salt


  • CAS Number: 2602-46-2
  • Synonyms/Related:
    • 2, 7-Naphthalenedisulfonic acid, 3,3'-[(4, 4'-biphenylylene) bis(azo) ]bis[5-amino-4-hydroxy-,tetrasodium salt
    • 2, 7-Naphthalenedisulfonic acid, 3,3'-[[1,1'-biphenyl]-4, 4'-diylbis(azo) ]bis[5-amino-4-hydroxy-, 3,3'-[[1,1'-biphenyl]-4, 4'-diylbis(azo) ]bis[5-amino-4-hydroxy-, tetrasodium salt
    • 2,7-Naphthalenedisulfonic acid, 3,3'-((1,1'-biphenyl)-4,4'-diylbis(azo)) bis(5-amino-4-hydroxy-, tetrasodium salt
    • 2,7-Naphthalenedisulfonic acid, 3,3'-((4,4'-biphenylylene) bis(azo)) bis(5-amino-4-hydroxy-, tetrasodium salt
    • 2,7-Naphthalenedisulfonic acid, 3,3'-[[1,1'-biphenyl]-4, 4'-diylbis (azo) ]bis[5-amino-4-hydroxy-, tetrasodium salt
    • Airedale Blue 2BD
    • Aizen Direct Blue 2BH
    • Amanil Blue 2BX
    • Atlantic Blue 2B
    • Atul Direct Blue 2B
    • Azocard Blue 2B
    • Azomine Blue 2B
    • Belamine Blue 2B
    • Bencidal Blue 2B
    • Benzanil Blue 2B
    • Benzo Blue BBA-CF
    • Benzo Blue BBN-CF
    • Benzo Blue GS
    • Blue 2B
    • Blue 2B salt
    • Brasilamina Blue 2B
    • Calcomine Blue 2B
    • Chloramine Blue 2B
    • Chlorazol Blue B
    • Chlorazol Blue BP
    • Chrome Leather Blue 2B
    • Cresotine Blue 2B
    • Diacotton Blue BB
    • Diamine Blue 2B
    • Diamine Blue BB
    • Diaphtamine Blue BB
    • Diazine Blue 2B
    • Diazol Blue 2B
    • Diphenyl Blue 2B
    • Diphenyl Blue KF
    • Diphenyl Blue M2B
    • Direct Blue 2B
    • Direct Blue 2BA
    • Direct Blue 6
    • Direct Blue 6 (technical grade)
    • Direct Blue 6, technical-grade [Benzidine-based dyes]
    • Direct Blue A
    • Direct Blue BB
    • Direct Blue GS
    • Direct Blue K
    • Direct Blue M2B
    • Direct Sky Blue K
    • Enianil Blue 2BN
    • Fenamin Blue 2B
    • Fixanol Blue 2B
    • Hispamin Blue 2B
    • Indigo Blue 2B
    • Kayaku direct
    • Kayaku Direct Blue BB
    • Mitsui Direct Blue 2BN
    • Modr Prima 6 [Czech]
    • NCI60_042144
    • Niagara Blue 2B
    • Nippon Blue BB
    • Paramine Blue 2B
    • Phenamine Blue BB
    • Pheno Blue 2B
    • Pontamine Blue BB
    • Sodium diphenyl-4, 4'-bis(azo)-2"-8"-amino-1"-naphthol-3",6"-disulfonate
    • Sodium diphenyl-4,4'-bis-azo-2"-8"-amino-1"-naphthol-3",6"-disulphonate
    • Tertrodirect Blue 2B
    • Tetrasodium 3,3'-((1,1'-biphenyl)-4,4'-diylbis(azo)) bis(5-amino-4-hydroxynaphthalene-2,7-disulphonate)
    • Vondacel Blue 2B


  • Boiling Point: K °C °F
  • Flammability:
    • Explosive Limits:
      • Lower Explosive Limit: 0%
      • Upper Explosive Limit: 0%
    • Flammable Limits:
      • Lower Flammable Limit: 0%
      • Upper Flammable Limit: 0%
    • Flash Point K °C °F
    • Autoignition Temperature: K °C °F
  • Melting Point: K °C °F

Related Resources

  • USDOT Hazardous Materials Table 49 CFR 172.101
    An online version of the USDOT's listing of hazardous materials from 49CFR 172.101. This table can be sorted by proper shipping name, UN/NA ID and/or by primary hazard class/division.
  • 2008 ERG (Emergency Response Guidebook)
    Have you ever wondered what those four digit numbers on the placards on the side of trucks and rail cars mean? Our online 2008 ERG will give you your answer. This is an online version of the guidebook produced by the USDOT for first responders during the initial phase of a Dangerous goods/HazMat incident. ERG data last verified/updated Oct. 2, 2011
  • US DOT Hazardous Materials Transportation Placards
    Hazardous materials placards (DOT placards) are required when shipping hazardous materials in the United States, Canada and Mexico. These pages provide US DOT definitions for each hazmat placard.
  • Guide for Handling Household Chemicals
    Things you can do to make your home safer.
  • Molarity, Molality and Normality
    Introduces stoichiometry and explains the differences between molarity, molality and normality.
  • Molar Mass Calculations and Javascript Calculator
    Molar mass calculations are explained and there is a JavaScript calculator to aid calculations.
  • Periodic Table of Elements
    Provides comprehensive data for each element of the periodic table of elements including up to 40 properties, names in 10 languages and common chemical compounds. Information also provided for 3,600 nuclides and 4,400 nuclide decay modes.

Editor's note: Some chemicals in this database contain more information than others due to the original reason this information was collected and how the compilation was accomplished.

While working with material safety data sheets (MSDS), I found that manufacturers sometimes used obscure names for constituent chemicals and I didn't always have a good idea of what I was dealing with. To resolve this problem, over the years, I compiled chemical names and identifiers into a personal database, cross referencing regulatory and health safety information when possible. Colleagues and friends eventually started suggesting that I make my data available on this website so that others could benefit from my efforts -- which I finally did in 2004. The more common, regulated and/or hazardous a chemical is, the more information I will have likely collected it.


If you are aware of any synonyms listed above that are registered trademarks, please contact us with relevant information so that trademarks can be appropriately noted.

Notes about mixtures

Some chemicals listed in this database or not pure chemical compounds, rather they are mixtures/solutions of chemicals. It is not uncommon for wide range of molar ratios of a mixture to be lumped together as "synonyms" of the same "chemical". In some instances chemicals that are very similar from a health & safety and/or regulatory standpoint also may have been lumped together.

Reference Sources

Data for this database was compiled from: hundreds of Material Safety Data Sheets (MSDS) of common industrial and household products; the Hazardous Materials Table from the United States "Code of Federal Regulations" title 49 section 172.101; the National Institute for Occupational Safety and Health Pocket Guide to Chemical Hazards; the US DOT 1996, 2000 & 2004 Emergency Response Guidebooks; U.S. National Library of Medicine and many other related resources.


WARNING: These pages are for general reference and educational purposes only and MUST NOT be relied upon as a sole source to determine regulatory compliance or where matters of life and health are concerned. This site and the author do not warrant or guarantee the accuracy or the sufficiency of the information provided and do not assume any responsibility for its use.

To ensure regulatory compliance when transporting hazardous materials or dangerous goods, one must receive proper training and certification from a qualified instructor and refer to the current year's Code of Federal Regulations Title 49 (49CFR) or your country's shipping regulations. In matters regarding workplace safety, refer to current OSHA regulations (29CFR) and NIOSH guidelines or your own country's health and safety regulations. No one should ever enter into a hazardous environment without proper training from qualified instructors.

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