Tetramethylthiuram monosulfide

CAS: 97-74-5

Overview

Tetramethylthiuram monosulfide ( CAS 97-74-5 ), commercially known as TMTM or Unads, is an organosulfur accelerator used primarily in rubber vulcanization and crop protection formulations.

Unlike its disulfide counterpart, the monosulfide structure offers a distinct cure profile suited to specific processing requirements. In rubber compounding, it functions as a primary or secondary accelerator.

This chemical enables controlled cure rates in natural and synthetic rubber goods including seals, hoses, and molded components. It is also used in agricultural formulations as a fungicide and seed treatment agent.

The product targets soil-borne pathogens in cereal and vegetable crops. Polymer stabilization is another application where it acts as an antioxidant additive in plastic compounds for long-term thermal stability.

In latex systems, it contributes to prevulcanization control, giving formulators tighter command over gel formation and final product consistency. This ensures high performance in specialized manufacturing environments.

The material is supplied as a pale yellow to off-white powder, the standard physical form for rubber and agricultural end uses. Technical grade is the predominant commercial specification for industrial use.

Purity is typically confirmed by active content assay to meet industry requirements. Pre-dispersed masterbatch forms are available for rubber processing applications where dust-free handling is a plant requirement.

Physical Properties

Melting Point	109.5 °C
Boiling Point	260.9±23.0 °C(Predicted)
Density	1.37 g/cm³ @ Temp: 20 °C
Flash Point	156 °C
Appearance	yellow powder
Color	Yellow
Odor	odorless
Form	Powder
Water Solubility	insoluble
Vapor Pressure	0.002Pa at 25℃
Refractive Index	1.4825 (estimate)
Log P	1.17 at 20℃

Safety & Handling

Warning GHS07 GHS09 GHS08 Hazard Statements H302 Harmful if swallowed H315 Causes skin irritation H317 May cause an allergic skin reaction H319 Causes serious eye irritation H332 Harmful if inhaled H341 Suspected of causing genetic defects 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 H411 Toxic to aquatic life with long lasting effects H302+H332 Harmful if swallowed or if inhaled Precautionary Statements P203 Obtain, consult and follow expert instructions for use. 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. P317 Get emergency medical help. P318 IF exposed or concerned, get medical advice. 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. 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. 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	29303000
UN Number	3077
ADR Class	9
Packing Group	III
Storage Class	11 - Combustible Solids
WGK (Germany)	3

Other Names

Industries

Agriculture & Feed Plastics & Polymers Rubber & Tire