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| Name | Exterior view | Chemical composition | Complex carrier | Characteristics |
|---|---|---|---|---|
| First OTOS-80 |  |
Chemical composition: N-Oxydiethylene thiocarbamoyl-N'-oxydiethylene sulfenamide | Complex carrier: EPDM/SBR | Characteristics: A delayed primary accelerator for common rubbers such as NR, SBR, NBR, and EPDM; it offers superior delaying effects and processing safety compared to other benzothiazole and sulfenamide accelerators like M and DM. Ideal for high-temperature vulcanization, this accelerator exhibits significant activity above a critical sulfurization temperature of 149°C. When used in natural rubber at elevated temperatures, it demonstrates excellent resistance to reduction, resulting in products with outstanding heat resistance and minimal compression set. |
| First NOBS(MBS)-80 |  |
Chemical composition: N-Oxydiethylene-2-benzothiazole sulfonamide | Complex carrier: EPDM/SBR | Characteristics: Suitable for natural rubber, styrene-butadiene rubber, cis-polybutadiene rubber, and other synthetic rubbers; it acts as a delayed-action vulcanization accelerator with lower activity but greater delay, resulting in shorter curing times and excellent scorch resistance. It ensures safe processing and prevents surface blooming, making it ideal for tire products. Due to growing environmental concerns, TBBS (NS) is now commonly used as a more eco-friendly alternative. |
| First CBS(CZ)-80 |  |
Chemical composition: N-Cyclohexyl-2-benzothiazole sulfenamide | Complex carrier: EPDM/SBR | Characteristics: Common post-curing accelerators for both natural and synthetic rubber offer excellent scorch resistance, ensure safe processing operations, and promote rapid vulcanization. They are particularly well-suited for carbon black compounds produced via the oil furnace method, which tend to have higher alkalinity levels. In synthetic rubber applications, these accelerators are often used in combination with other accelerators such as TMTM, TMTD, PZ, DPG, or other alkaline-based promoters. Additionally, they can be activated by M or DM, effectively enhancing the set stress and tensile strength of the vulcanized rubber. While exhibiting slight discoloration, they do not bleed to the surface, and the resulting vulcanizates demonstrate outstanding mechanical properties and superior aging resistance. |
| First TBBS(NS)-80 |  |
Chemical composition: N-tert-Butyl-2-benzothiazole sulfonamide | Complex carrier: EPDM/SBR | Characteristics: Post-effect accelerators for natural rubber, synthetic rubber, and reclaimed rubber—particularly well-suited for carbon black compounds with high alkalinity. They ensure safety at processing temperatures, exhibit excellent scorch resistance, promote rapid vulcanization, deliver high tensile strength, and allow for increased incorporation of synthetic rubber. Importantly, these accelerators do not generate nitrosamines, the carcinogenic byproducts typically associated with vulcanization, making them an ideal NOBS replacement while also offering outstanding overall performance—they’re often referred to as the "standard accelerator." Additionally, they can be used in combination with thiazole, guanidine, and aldehyde-amine accelerators to enhance activity, and when paired with the scorch inhibitor PVI, they form a highly effective vulcanization system. |
| First MDB-75 |  |
Chemical composition: 2-(4-Morpholinothio)benzothiazole | Complex carrier: EPDM/SBR | Characteristics: Post-accelerators and vulcanizing agents for natural rubber and synthetic rubber. When used as an accelerator, it exhibits performance similar to CZ in NR and SBR. As a vulcanizing agent, its application is comparable to TMTD, yet it offers superior scorch resistance. However, when used alone, it cures relatively slowly; therefore, it’s advisable to add a small amount of thiazole or dithiocarbamate accelerators to enhance the process. |
| First MBTS(DM)-75 |  |
Chemical composition: Dibenzothiazole dithide | Complex carrier: EPDM/SBR | Characteristics: A general-purpose accelerator for natural rubber, synthetic rubber, and reclaimed rubber—offers excellent flatness, moderate vulcanization speed, a relatively high critical vulcanization temperature, significant post-cure effects, prevents premature curing, and ensures safe handling. |
| First ZMBT (MZ)-80 |  |
Chemical composition: Zinc 2-mercaptobenzothiazole salt | Complex carrier: EPDM/SBR | Characteristics: High-speed vulcanization accelerators for natural and synthetic rubber, free from rubber staining properties. MZ exhibits the same performance as M, with a critical vulcanization temperature of 138°C, outstanding scorch resistance, enhanced operational safety, minimal risk of premature curing, and an exceptionally wide vulcanization plateau. |
| First MBT(M)-75 |  |
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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