Description

m-Toluenesulfonic Acid Monohydrate is a versatile and highly effective organic acid catalyst and reagent. This compound is valued for its strong acidity and solubility in organic solvents, making it a superior alternative to mineral acids in many synthetic processes. It is essential for manufacturers and researchers in the pharmaceutical, agrochemical, polymer, and specialty chemical industries seeking efficient and selective acid-catalyzed reactions.

Application

• Pharmaceutical Synthesis: As a catalyst in esterification, alkylation, and protection/deprotection reactions for active pharmaceutical ingredient (API) manufacturing.
• Polymer & Resin Production: Used as a curing agent and catalyst in the synthesis of phenolic resins, epoxy resins, and other thermosetting polymers.
• Agrochemical Intermediates: Facilitates key condensation and cyclization reactions in the production of herbicides, fungicides, and insecticides.
• Fine Chemical Synthesis: Employed in the preparation of dyes, fragrances, and other specialty organic compounds requiring mild acid conditions.
• Electroplating & Surface Treatment: Acts as an additive in electroplating baths and metal surface treatment formulations.
• Laboratory Research: A standard reagent in academic and industrial R&D for organic synthesis and method development.

Basic Information

Item	Detail
Product Name	m-Toluenesulfonic Acid Monohydrate
CAS No.	312619-56-0
Molecular Formula	C7H8O3S · H2O
Molecular Weight	190.20 g/mol
Synonyms	3-Methylbenzenesulfonic Acid Monohydrate; meta-Toluenesulfonic Acid Monohydrate; m-TSA Monohydrate; Tosic Acid Monohydrate; 3-Toluenesulfonic Acid Hydrate; MTSA; Benzenesulfonic acid, 3-methyl-, monohydrate
EINECS	Contact for details

Quality Control

Our m-Toluenesulfonic Acid Monohydrate is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing to ensure it meets precise specifications for purity, identity, and performance. A Certificate of Analysis (COA) documenting assay, impurity profile, and physical properties is provided with every shipment to guarantee consistency and support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and should be kept under dry conditions to prevent caking or degradation. Keep away from strong bases and incompatible materials.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (Titration)	≥ 98.0 %
Water Content (KF)	8.0 - 10.0 %
Residue on Ignition	≤ 0.1 %
Heavy Metals (as Pb)	≤ 20 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.