TMTD vs TMTM, TETD and CBS: Choosing a Thiuram Accelerator

The thiuram family cures rubber faster than any other accelerator class, and TMTD is its best-known member. But TMTM, TETD and the sulfenamide CBS all sit nearby, and the differences matter. This page sets them side by side.

1. The family

Accelerator	CAS	Type	Sulfur donor?
TMTM	97-74-5	Thiuram monosulfide	No
TMTD	137-26-8	Thiuram disulfide	Yes
TETD	97-77-8	Thiuram disulfide	Yes
CBS	95-33-0	Sulfenamide	No

2. The comparison that matters

Property	TMTM	TMTD	TETD	CBS
Class	Thiuram	Thiuram	Thiuram	Sulfenamide
Cure speed	Fast	Very fast	Fast	Delayed, then fast
Scorch safety	Short	Short	Short	High
Sulfur donor	No	Yes	Yes	No
Typical dosage	0.3 – 1.5 phr	0.2 – 3 phr	0.2 – 2 phr	0.5 – 2 phr
Typical role	Secondary accelerator	Ultra-accelerator + sulfur donor	Accelerator + donor	Primary accelerator for tyres

3. How to think about the choice

Thiurams (TMTM, TMTD, TETD) are the fastest accelerators and have the shortest scorch times. They are almost always used with a thiazole or sulfenamide, not alone.
If you need a sulfur donor (EV / low-sulfur systems), pick a disulfide: TMTD or TETD. TMTM is a monosulfide and does not donate sulfur.
If you need processing safety (tyres, thick or complex parts), that is a sulfenamide job – CBS or TBBS – not a thiuram.
For a fast, economical boost to a thiazole system, thiurams are added at low dose as secondary accelerators.

4. Quick selection rules

Sulfur donor needed? TMTD or TETD (disulfides).
Just a fast secondary accelerator? TMTM or TMTD, at low dose.
Processing safety needed? Sulfenamide (CBS/TBBS), not a thiuram.
Latex / low-temperature cure? Thiuram, often with a dithiocarbamate.
Confirm on the compound with cure rheometry and scorch testing.

5. Handling notes for the whole family

Sensitizers. Thiurams are skin sensitizers (and TMTD can sensitise the respiratory tract) – use dust control and PPE.
Aquatic toxicity. Thiurams are toxic to aquatic life.
Storage. Keep sealed, cool and dry, away from oxidisers and acids.

Frequently Asked Questions

What is the difference between TMTD and TMTM?

TMTD is the disulfide and acts as both an ultra-accelerator and a sulfur donor; TMTM is the monosulfide and acts only as an accelerator.

Is TETD the same as TMTD?

No. Both are thiuram disulfides and both can donate sulfur, but they are different molecules (TETD is the diethyl compound) with different cure behaviour.

Should I use TMTD or CBS?

Use TMTD for a very fast cure and/or as a sulfur donor in an EV system; use CBS where processing safety and a delayed cure are needed (tyres and technical goods).

Can thiurams be used alone?

Rarely – their scorch times are short. They are normally blended with a thiazole or sulfenamide.