Tiron, GR

About Tiron, GR

Tiron is an indicator (AR grade) carrying the CAS registry number 149-45-1. Formula C6H4Na2O8S2, molecular weight 314.2 g/mol. Systematically, it is named disodium, 4,5-dihydroxybenzene-1,3-disulfonate. Alternative names: Sodium pyrocatechol-3,5-disulfonate and Disodium 4,5-dihydroxybenzene-1,3-disulfonate.

The material typically appears as a white to off-white to grey powder. Literature values give a melting point of above 300 °C. Store in a tightly closed container in a cool, dry and well-ventilated place. Under GHS it is labelled “Warning”, so handle it with suitable PPE and consult the SDS.

Typical applications include titration end-point detection, pH determination and analytical testing. It is used across academic and industrial research.

Standard pack sizes are 5 g, 10 g, 25 g and 100 g, and every batch ships with a Certificate of Analysis (COA) and we export worldwide.

Typical applications

Titration end-point detection
pH determination
Analytical testing

Industries

Grade guides

Specifications & identifiers

Chemical identifiers
Product name	Tiron, GR
Catalogue No.	VQ-000417
CAS Number	149-45-1
IUPAC name	disodium;4,5-dihydroxybenzene-1,3-disulfonate
Molecular formula	C₆H₄Na₂O₈S₂
Molecular weight	314.2 g/mol
Exact mass	313.9143
Grade	AR
HSN code	29081900
InChIKey	ISWQCIVKKSOKNN-UHFFFAOYSA-L
SMILES	C1=C(C=C(C(=C1O)O)S(=O)(=O)[O-])S(=O)(=O)[O-].[Na+].[Na+]
PubChem CID	9001

Physical properties
Physical form	Powder
Appearance	White to off-white to grey powder
Melting point	>300 °C
H-bond donors / acceptors	2 / 8
TPSA	172 Å²
Synonyms	4,5-Dihydroxy-1,3-benzenedisulfonic acid disodium salt, 3,5-Pyrocatecholdisulfonic acid disodium salt monohydrate, 1,2-Dihydroxy-3,5-benzenedisulfonic acid disodium salt, di-Sodium 4,5-dihydroxy-1,3-benzenedisulfonate, Sodium pyrocatechol-3,5-disulfonate, Disodium 4,5-dihydroxybenzene-1,3-disulfonate, Sodium 4,5-dihydroxybenzene-1,3-disulfonate, Sodium catechol sulfate, Disodium pyrocatechol-3,5-disulfonate, sodium catechol disulfonate, 1,2-Dihydroxybenzene-3,5-disulfonic acid disodium salt, 3,5-Disulfocatechol 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

Frequently asked questions

What is the CAS number of Tiron, GR?

The CAS Registry Number of Tiron, GR is 149-45-1. It is also known as 4,5-Dihydroxy-1,3-benzenedisulfonic acid disodium salt, 3,5-Pyrocatecholdisulfonic acid disodium salt monohydrate, 1,2-Dihydroxy-3,5-benzenedisulfonic acid disodium salt.

What is the molecular formula and molecular weight of Tiron, GR?

Tiron, GR has the molecular formula C6H4Na2O8S2 and a molecular weight of 314.2 g/mol.

Which grade and pack sizes of Tiron, GR can I order?

We supply Tiron, GR in AR grade, in 5 g, 10 g, 25 g, 100 g, 1 kg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Tiron, GR?

Yes. Every lot of Tiron, GR 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 Tiron, GR be shipped internationally?

Yes. Tiron, GR 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.