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Need to eliminate reversion in thick natural rubber parts and improve steel cord adhesion? First® TBSI‑75 replaces TBBS+PVI with a single accelerator. No reversion, water‑stable, and significantly boosts heat‑aged adhesion to brass‑plated steel. Ideal for heavy truck tires, earthmover treads, and conveyor belts.
Need a drop‑in replacement for NOBS without nitrosamine risk? First® TBBS‑80 is the “standard accelerator.” No nitrosamines, same scorch safety and fast cure. Ideal for high‑alkalinity carbon black compounds. REACH compliant.
First Rubber MBTS(DM) is a general-purpose thiazole accelerator, chemically known as dibenzothiazole disulfide or 2,2'-dithiobis(benzothiazole). It provides a medium-fast cure rate with excellent processing safety and non-staining characteristics. MBTS is compatible with natural rubber (NR) and most synthetic rubbers including SBR, BR, NBR, and EPDM. It can be used alone or synergistically with aldehyde amines, thiurams, dithiocarbamates, and guanidines to increase cure rates. It also functions as a retarder and plasticizer in polychloroprene (CR) compounds. Recommended dosage: 0.5-2.0 phr.
First Rubber MBT-75 is a pre-dispersed thiazole accelerator masterbatch with 75% 2-mercaptobenzothiazole active content. It provides very fast cure speed and a low vulcanization temperature of approximately 125°C, making it ideal for efficient, high-productivity rubber processing. Compatible with NR, SBR, NBR, EPDM, and CR. Non-staining and non-discoloring. Can be used alone or synergistically with secondary accelerators (guanidines, thiurams, dithiocarbamates). Also acts as a retarder in sulfur-free CR compounds. Dosage: as primary 0.5-3.0 phr; as secondary 0.2-0.8 phr.
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