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First MBT(M)-75
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- Chemical composition: 2-Thiobenzothiazole
- Complex carrier: EPDM/SBR
- Characteristics: A general-purpose accelerator for both natural and synthetic rubber. It offers rapid vulcanization rates, requires low vulcanization temperatures (as low as 125°C), and provides a wide vulcanization plateau. Used in sulfur-free or low-sulfur systems, as well as in chloroprene rubber, it functions effectively as an anti-scorch agent and a vulcanization retarder. Additionally, it helps plasticize and soften raw rubber.
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Pain point you may have faced
MBT powder has been a industry standard for decades – but it comes with trade‑offs. The powder is dusty, hard to weigh accurately, and tends to agglomerate in humid storage. Worse, MBT is known to be “scorchy.” In compounds with high furnace black loadings, the scorch safety window can be dangerously narrow, forcing you to slow down mixing or risk bin‑cure. You need the proven performance of MBT without the handling headaches and scorch anxiety.Why MBT‑75 is different
First® MBT‑75 (2‑Mercaptobenzothiazole) is a general‑purpose thiazole accelerator for natural and synthetic rubbers, pre‑dispersed in an EPDM carrier as dust‑free granules. It delivers the same fast vulcanization speed and low activation temperature (125 °C) as traditional MBT powder, but with none of the dust, caking, or weighing errors. The granule form also ensures more uniform dispersion, eliminating the local over‑concentration that often triggers scorch with powder forms.What you gain
Fast cure at low temperature – ideal for thick sections or heat‑sensitive compounds.
Broad vulcanization plateau – forgiving cure window, less sensitive to over‑cure.
Improved scorch management – while MBT is inherently scorchy, the pre‑dispersion helps avoid hot spots; for extra safety, use secondary accelerators like thiurams or guanidines to boost activity without sacrificing latency.
Versatility – works as a primary accelerator for general rubber goods, or as a secondary accelerator to fine‑tune cure systems.
Clean handling – no airborne dust, no sticky residue on mixing equipment.
Real‑world result
An EPDM profile extruder relied on powdered MBT for their general‑purpose compound. Dust plagued the weighing area, and occasional scorch occurred when factory temperatures rose in summer. After switching to First® MBT‑75 granules at the same dosage (1.2 phr), the shop floor became visibly cleaner. Scorch complaints dropped by 70%, and the production manager noted that the granules flowed freely through their automated weighing system.Typical specifications
Appearance: yellow to light yellow granules
Active ingredient: 2‑Mercaptobenzothiazole (approx. 75%)
Carrier: EPDM/SBR
Vulcanization temperature: active above 125 °C
Recommended dosage: 0.5–2.0 phr (as primary accelerator; reduce when used as secondary)
Packaging: 25 kg carton with inner PE liner
Storage: 12 months in unopened packaging, cool and dry (below 40 °C)
Samples and technical data sheets are available. No hard selling — just for your evaluation.
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