Phenothiazine

CAS: 92-84-2

Overview

Phenothiazine (CAS 92-84-2 ), also known as PTZ, is an organosulfur heterocyclic compound used industrially as an antioxidant, polymerization inhibitor, and biocide across multiple manufacturing sectors.

It prevents premature crosslinking, oxidative degradation, and microbial activity in chemical processes and formulated products. In polymer and plastics production, PTZ acts as a monomer stabilizer.

This material inhibits runaway polymerization of vinyl and acrylic monomers during storage and transport. Rubber compounders use it as an antioxidant to extend the service life of tire and industrial rubber goods.

The compound performs exceptionally well under heat and mechanical stress. In lubricant and metalworking fluid formulations, it controls oxidative breakdown at elevated operating temperatures, reducing deposit formation.

Agricultural applications include its use as an anthelmintic active and as a component in veterinary formulations targeting parasitic infections in livestock. It is a versatile chemical intermediate for many sectors.

Phenothiazine is supplied as a light gray to greenish crystalline powder or granules, with granulated forms preferred where dust control is a handling priority for safety and efficiency.

Technical grade is the standard for industrial antioxidant and inhibitor applications. Purity specifications typically range from 98% to 99%+, with documentation including COA and MSDS as standard for bulk procurement.

Physical Properties

Melting Point	185.1 °C
Boiling Point	371 °C @ Press: 760 Torr
Density	1.34 g/cm³
Flash Point	202°C
Appearance	Phenothiazine is a greenish-yellow to greenish-gray crystalline substance. Slight odor and taste.
Color	Yellow
Form	Prills or Beads
Water Solubility	2 mg/L (25 ºC)
Vapor Pressure	0.0000647 Pa (20 °C)
Refractive Index	1.6353
pH	6 (10g/l, H2O, 20℃)(aqueous suspension)
Log P	3.78 at 25℃

Safety & Handling

Warning GHS07 GHS08 GHS09 Hazard Statements H302 Harmful if swallowed H303 May be harmful if swallowed H315 Causes skin irritation H317 May cause an allergic skin reaction H320 Causes eye irritation H335 May cause respiratory irritation H370 Causes damage to organs H373 May causes damage to organs through prolonged or repeated exposure H400 Very toxic to aquatic life H410 Very toxic to aquatic life with long lasting effects H412 Harmful to aquatic life with long lasting effects Precautionary Statements P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P272 Contaminated work clothing should not be allowed out of the workplace. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P330 Rinse mouth. P391 Collect spillage. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P301+P317 Get emergency medical help. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P308+P316 Get emergency medical help immediately. P332+P317 Get emergency medical help. P333+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code	29343090
Storage Class	11 - Combustible Solids
WGK (Germany)	1

Other Names

Industries

Lubricants & Metalworking Rubber & Tire Plastics & Polymers Agriculture & Feed