Overview
Tetramethylthiuram Disulfide (CAS 137-26-8 ), commercially known as Thiram and abbreviated TMTD, is an organosulfur compound used as a rubber vulcanization accelerator, fungicide, and industrial biocide.
It functions across rubber processing, crop protection, and preservation applications where sulfur-donor chemistry is required. In rubber and tire manufacturing, TMTD acts as a primary or secondary vulcanization accelerator.
This chemical enables efficient crosslinking at lower temperatures and improves aging resistance in finished rubber goods. In agriculture, Thiram is an active ingredient in seed treatment and foliar fungicide formulations.
It protects crops against a broad spectrum of fungal pathogens including Botrytis and Fusarium species. Industrial formulators use it as a biocide in latex preservation and polymer stabilization for aqueous rubber dispersions.
The compound also functions as a catalyst precursor in certain specialty chemical syntheses where controlled sulfur donation is required. It is supplied as a white to off-white powder or as pre-dispersed granules.
Standard grades include technical-grade material meeting rubber industry specifications, as well as agricultural-grade material conforming to FAO/WHO pesticide standards. Purity typically ranges from 95% to 98%+.
The material is available in masterbatch forms suited for rubber compounding to ensure uniform distribution. This versatility makes it a critical component for manufacturers requiring high-performance sulfur-donor chemistry.
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Physical Properties
| Melting Point | 155-156 °C |
| Boiling Point | 129 °C @ Press: 20 Torr |
| Density | 1.29 g/cm³ @ Temp: 20 °C |
| Flash Point | 89°C |
| Appearance | Thiram is a colorless to yellow, crystalline solid. Characteristic odor. Commercial pesticide products may be dyed blue. |
| Odor | char. odor |
| Form | solid |
| Water Solubility | 16.5 mg/L (20 ºC) |
| Vapor Pressure | 8 x 10 -6 mmHg at 20 °C (NIOSH, 1997) |
| Refractive Index | 1.5500 (estimate) |
| Log P | 1.730 |
Safety & Handling
Warning GHS07 GHS08 GHS09 GHS06 Hazard Statements H302 Harmful if swallowed H315 Causes skin irritation H316 Causes mild skin irritation H317 May cause an allergic skin reaction H319 Causes serious eye irritation H320 Causes eye irritation H330 Fatal if inhaled H332 Harmful if inhaled H340 May cause genetic defects H341 Suspected of causing genetic defects H361 Suspected of damaging fertility or the unborn child H370 Causes damage to organs H372 Causes damage to organs through prolonged or repeated exposure 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 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. P284 In case of inadequate ventilation wear respiratory protection. P316 Get emergency medical help immediately. P317 Get emergency medical help. P318 IF exposed or concerned, get medical advice. P319 Get medical advice/attention if you feel unwell. P320 Specific treatment is urgent (see … on this label). 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 | 29303000 |
| UN Number | 2771 |
| Storage Class | 13 - Non Combustible Solids |
| WGK (Germany) | 3 |
Other Names
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Chemical Properties
- CAS Number
- 137-26-8
- EC Number
- 205-286-2
- Mol. Weight
- 240.4
- HS Code
- 29303000
- Category
- Agrochemicals