Rubber chemicals: Characteristics
Why tyre makers want dust-free granules, not powder
What this tab covers The physical and chemical properties that set its grade, price and uses, with the commercial grades and the standards that define them.Tyre makers buy on purity, melting point, particle form (dust-free granules), scorch safety and cure rate in their compounds, and qualify each supplier over months.
Properties that matter commercially
| Property | Value / specification | Why it matters | Source |
|---|---|---|---|
| Purity / assay | typically 95-99% depending on product (indicative) | consistent cure | indicative |
| Form | granules or pastilles rather than powder | dust and dosing | indicative |
| Scorch time | product-specific (delayed action for sulphenamides) | processing safety | indicative |
Commercial grades
- MBT, MBTS
- CBS, TBBS, MBS sulphenamides
- TMTD, ZDEC dithiocarbamates
- DPG
- 6PPD, IPPD
- TMQ/TDQ
- Insoluble sulphur
- PVI retarder