TMTD in Latex, Adhesives and Low-Temperature Vulcanisation

TMTD (tetramethylthiuram disulfide, CAS 137-26-8) is not only a dry-rubber accelerator. Its very fast action and its ability to work at low temperature make it valuable in latex compounds, adhesives and room-temperature curing systems – applications where a conventional high-temperature cure is not available. This guide covers where TMTD is used in those systems and how it is applied.

1. Why TMTD suits latex and low-temperature cure

Very fast. As a thiuram, TMTD cures quickly, which matters when the cure temperature is limited.
Low-temperature activity. With a dithiocarbamate co-accelerator it will cure at or near room temperature.
In aqueous systems. Dispersed or dissolved TMTD works in latex, where it cooperates with zinc oxide.
Sulfur donor. In a latex or low-sulfur system it can also supply crosslinking sulfur.

2. Latex compounds

In latex the cure system is usually TMTD or a dithiocarbamate with zinc oxide and sulfur (or a sulfur donor). Typical latex goods:

Product	Role of the TMTD system
Dipped gloves and balloons	Fast, controllable cure in a thin film
Latex foam and sponge	Cure that matches the foaming and gelling stages
Threads and elastic goods	Continuous, fast cure
Adhesives and binders	Vulcanising a latex binder in situ

Parameter	Typical practice
TMTD level in latex	About 0.5 – 2 phr (on solids), with ZnO and sulfur/donor
Co-accelerator	A dithiocarbamate (for example ZDEC) for very fast / low-temperature cure
pH	Alkaline latex systems; keep the pH stable for a consistent cure

3. Low-temperature and room-temperature cure

Where a compound cannot be heated – field repairs, some adhesives, certain moulded goods – the cure system has to be active at ambient or slightly elevated temperature. TMTD with a dithiocarbamate is one of the classic combinations for this.

System	Typical cure temperature	Note
TMTD + dithiocarbamate (ultra)	Ambient to slightly elevated	Very fast; pot life must be managed
TMTD + thiazole	Elevated (for example 100-150 deg C)	Fast but more controllable
TMTD + sulfenamide	Elevated	Delay then fast; better processing safety

Because these systems cure quickly, the compound’s pot life (scorch) is short – mix in small batches and use promptly, or control the temperature to extend the working time.

4. Adhesives and rubber-to-substrate bonding

Latex-based adhesives – TMTD vulcanises the rubber phase of the adhesive to develop strength and heat resistance.
Rubber-to-metal bonding – cure systems containing TMTD are used in bonding compounds and in some adhesive formulations.
Self-vulcanising adhesives – systems that cure at room temperature after application.

5. Dosage (starting points)

Use	Typical dosage
Latex compound	About 0.5 – 2 phr on solids
Ultra / low-temperature system	About 0.5 – 1.5 phr with a dithiocarbamate
Sulfur donor in a latex EV system	About 1 – 2 phr

All doses are system-specific and must be confirmed by cure testing on the actual latex or adhesive.

6. Handling, safety and regulation

Sensitizer. TMTD is a skin (and respiratory) sensitizer – handle as a dust-controlled dispersion or powder with PPE.
Harmful if swallowed or on skin; eye irritant; very toxic to aquatic life. Prevent release to drains and watercourses.
Alcohol reaction. TMTD can cause a disulfiram-like reaction with alcohol – warn workers.
Regulatory. As an industrial rubber chemical TMTD is widely used; as a plant-protection product (thiram) it is restricted in some regions. Confirm the requirements for your market.

7. Buying TMTD for latex and adhesive use

Confirm the form: powder for dispersion, or granules for dry handling.
Ask for the per-batch COA (melting point, loss on heating, ash, sieve residue).
Confirm dispersibility if you prepare aqueous dispersions.
State the application (latex / adhesive / dry rubber) on the enquiry so the right documentation is supplied.

Frequently Asked Questions

Can TMTD be used in latex?

Yes – it is a common accelerator in latex compounds, usually with zinc oxide and sulfur or a sulfur donor, and often with a dithiocarbamate for a faster cure.

Can TMTD cure rubber at room temperature?

With a dithiocarbamate co-accelerator it forms a very fast, low-temperature cure system. Pot life is short, so mix and use accordingly.

Is TMTD used in adhesives?

Yes – in latex-based and self-vulcanising adhesives, where it vulcanises the rubber phase and develops strength and heat resistance.

How much TMTD is used in latex?

About 0.5-2 phr on solids as a starting point, confirmed by cure testing on the actual latex.