Chromotrope 2B

Name: Chromotrope 2B
Brand: Vaqora Chemicals
SKU: VQ-045601

About Chromotrope 2B

Chromotrope 2B is a biological stain carrying the CAS registry number 548-80-1. Formula C16H9N3Na2O10S2, molecular weight 513.4 g/mol. It is also known as Chromotrope Red 4B or Khromotrop 2B.

Store sealed in a dry, well-ventilated location away from incompatible materials. The GHS classification uses the signal word “Warning”, so appropriate gloves, eye protection and ventilation are recommended.

Key uses span histology and cytology staining, microscopy, clinical laboratories and biological staining. It is used across academic and industrial research, diagnostics and biotechnology and textiles and dyeing.

Vaqora Chemicals supplies Chromotrope 2B in 5 g and 25 g packs, each shipped with a Certificate of Analysis (COA), and exports worldwide. SDS and detailed specification sheets can be requested with your quotation. Larger quantities and custom packaging are available. Request a quote for pricing and lead time.

Typical applications

Histology & cytology staining
Microscopy
Clinical laboratories
Biological staining

Industries

Specifications & identifiers

Chemical identifiers
Product name	Chromotrope 2B
Catalogue No.	VQ-045601
CAS Number	548-80-1
IUPAC name	disodium;4,5-dihydroxy-3-[(4-nitrophenyl)diazenyl]naphthalene-2,7-disulfonate
Molecular formula	C₁₆H₉N₃Na₂O₁₀S₂
Molecular weight	513.4 g/mol
Exact mass	512.9525
HSN code	29270090
InChIKey	AXUUHWJXDWBCSG-UHFFFAOYSA-L
SMILES	C1=CC(=CC=C1N=NC2=C(C3=C(C=C(C=C3C=C2S(=O)(=O)[O-])S(=O)(=O)[O-])O)O)[N+](=O)[O-].[Na+].[Na+]
PubChem CID	68360

Physical properties
Physical form	Other
H-bond donors / acceptors	2 / 12
TPSA	242 Å²
Synonyms	Chromotrope Red 4B, Khromotrop 2B, Naphtocard Fast Red 3B, C.I. Acid Red 176, C.I. Acid Red 176 (VAN), p-Nitrobenzeneazochromotropic acid sodium salt, 2,7-Naphthalenedisulfonic acid, 4,5-dihydroxy-3-((4-nitrophenyl)azo)-, disodium salt, C.I. Acid Red 176, disodium salt, PCR 2B, CR-2B, Disodium 4,5-dihydroxy-3-(p-nitrophenylazo)naphthalene-2,7-disulphonate, 2,7-Naphthalenedisulfonic acid, 4,5-dihydroxy-3-[(4-nitrophenyl)azo]-, disodium salt

Safety & hazard information (GHS)

Harmful / irritant

Signal word: Warning

Hazard statements

H315Causes skin irritation
H319Causes serious eye irritation
H335May cause respiratory irritation

Precautionary statements: P261, P264, P264 + P265, P271, P280, P302 + P352, P304 + P340, P305 + P351 + P338, P319, P321, P332 + P317, P337 + P317, P362 + P364, P403 + P233, P405, P501

Classification is indicative (aggregated GHS notifications) and may vary by grade and concentration. Always refer to the SDS supplied with your lot.

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Other grades of CAS 548-80-1

AR

Chromotrope 2B, GR

CAS: 548-80-1
Formula: C₁₆H₉N₃Na₂O₁₀S₂
MW: 513.4 g/mol

VQ-000534

Frequently asked questions

What is the CAS number of Chromotrope 2B?

The CAS Registry Number of Chromotrope 2B is 548-80-1. It is also known as Chromotrope Red 4B, Khromotrop 2B, Naphtocard Fast Red 3B.

What is the molecular formula and molecular weight of Chromotrope 2B?

Chromotrope 2B has the molecular formula C16H9N3Na2O10S2 and a molecular weight of 513.4 g/mol.

Which grade and pack sizes of Chromotrope 2B can I order?

We supply Chromotrope 2B, in 5 g, 25 g packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Chromotrope 2B?

Yes. Every lot of Chromotrope 2B is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can Chromotrope 2B be shipped internationally?

Yes. Chromotrope 2B is classified as hazardous, so it is packed in UN-approved packaging and shipped as dangerous goods under IATA/IMDG rules. We export worldwide on EXW, FOB, CIF and DAP terms.