Here are the physical properties of Sodium 2-Mercaptobenzothiazole (MBT•Na), synthesized from authoritative chemical databases and supplier specifications.
General Identity
Chemical Name: Sodium 2-mercaptobenzothiazole
CAS Number: 2492-26-4
Molecular Formula: C₇H₄NNaS₂
Molecular Weight: 189.22 g/mol
Physical Properties (General)
These properties represent the pure chemical substance or vary by form.
Property Value Notes / Reference
Physical State Liquid; Pellets or Large Crystals Can also be found as off-white solid or powder.
Color Yellowish; Light amber; Yellow transparent
Odor Odor of old rubber Characteristic sulfurous odor.
Melting Point -6 °C (21 °F) The pure salt has a very low melting point.
Boiling Point 103 °C (217 °F)
Flash Point > 93 °C (> 200 °F) Classified as non-flammable under standard testing.
Solubility Soluble in water ≥ 100 mg/mL at 20 °C.
Vapor Pressure 24 mmHg at 25 °C
Physical Properties (Common Commercial 50% Solution)
In industrial water treatment, MBT•Na is typically supplied as a 50% aqueous solution. The specifications are as follows:
Property Value / Specification
Appearance Yellow to amber transparent liquid
Concentration (Solid Content) 50.0% (minimum)
Density ≥ 1.20 g/cm³ (at 20°C)
pH 9.0 – 11.5 (for a 1% aqueous solution)