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| Name | Exterior view | Chemical composition | Complex carrier | Characteristics |
|---|---|---|---|---|
| First IS90-80 |  |
Chemical composition: Insoluble sulfur | Complex carrier: EPDM/SBR | Characteristics: It serves as a vulcanizing agent for both natural and synthetic rubber; offering superior thermal stability, it helps prevent sulfur migration during processing and storage, while also reducing the tendency of accelerators (such as thiazoles) to cause "sulfur blooming." Additionally, it enhances the adhesion between the rubber compound and other reinforcing materials. This product is suitable for applications in tires, hoses, belts, footwear, and various industrial products. |
| First MAC-1489 |  |
Chemical composition: Highly Effective Anti-Yellowing Promoter | Complex carrier: EPDM | Characteristics: Outstanding yellowing resistance, achieving grades 4.0 to 5 under stable conditions with other ingredients in the formulation; exhibits a moderate vulcanization speed, resulting in wear resistance, tensile strength, and tear resistance that are comparable to those of standard accelerator-enhanced products. Additionally, it is free from contamination and discoloration, ensuring consistent color stability in rubber products—particularly making it ideal for use in rubber shoe soles. This product also boasts excellent scorch resistance when compounded into rubber, allowing it to remain stable at room temperature for 3–5 days, thus overcoming the common issue of short scorch times associated with conventional yellowing-resistant accelerators. It is primarily used in white and light-colored rubber shoe soles, as well as other rubber products. |
| First EM33-75 |  |
Chemical composition: EPDM Comprehensive Accelerator | Complex carrier: EPDM | Characteristics: A comprehensive accelerator specifically designed for EPDM, offering high vulcanization efficiency and excellent vulcanization flatness. It can be used alone or combined with ZDBC and ZDEC for even faster curing rates. This product is non-staining, does not cause discoloration, and disperses easily, making it ideal for white or light-colored rubber products. It is commonly employed in EPDM-based sealing strips, hoses, molded components, and other similar applications. |
| First MAC-3108 |  |
Chemical composition: Environmentally friendly, highly efficient promoter without a thiazole structure | Complex carrier: EPDM/SBR | Characteristics: A comprehensive eco-friendly accelerator suitable for NR, SBR, BR, EPDM, IIR, and other rubbers; it can be used as the primary accelerator on its own or combined with small amounts of TBzTD-75, ZBEC-75, ZDTP-50, and other components to create an environmentally friendly vulcanization system. This system delivers rapid curing speeds while completely eliminating the thiourea structure, ensuring a non-bitter taste. Importantly, no nitrosamine carcinogens are produced during the vulcanization process. During storage, the product may gradually change from pale yellow to gray, though it remains non-staining to rubber. |
| First ZBEC (ZTC)-75 |  |
Chemical composition: Zinc dibenzyl dithiocarbamate | Complex carrier: EPDM | Characteristics: An ultrafast accelerator for synthetic rubbers such as NR, EPDM, IR, SBR, NBR, and IIR; it belongs to the class of secondary amine dithiocarbamate accelerators and does not generate nitrosamines during vulcanization. Typically used in conjunction with products like TBBS-80 and TBzTD-75, it forms an environmentally friendly vulcanization system. Among all zinc dithiocarbamate accelerators, this one exhibits the best scorch resistance. |
| First TBzTD-75 |  |
Chemical composition: Tetrabenzyl tetraurea | Complex carrier: EPDM | Characteristics: Fast-acting vulcanization accelerators and sulfur carriers in both natural and synthetic rubber are primarily used as a replacement for TMTD. During the vulcanization process, they do not generate or release carcinogenic nitrosamine compounds, thereby complying with Germany’s "Technical Rules for Hazardous Substances" TRGS 552 regarding nitrosamine toxicity. TBzTD-75GE offers a longer scorch time compared to TMTD-75GE. It is occasionally employed as a PVC rubber vulcanization inhibitor. Additionally, TBzTD-75 can serve as a delayed-action agent when used alongside ETU-75 in mercaptan-modulated chloroprene rubber compounds. |
| First TBSI-75 |  |
Chemical composition: N-tert-Butyl-bis(2-benzothiazolyl) sulfenimide | Complex carrier: EPDM/SBR | Characteristics: Natural rubber and synthetic rubber's post-curing, eco-friendly accelerators—particularly suited for carbon black compounds with high alkalinity—offer excellent scorch resistance, ensuring safe handling even at elevated temperatures. They also promote faster vulcanization while maintaining outstanding resistance to reduction. These accelerators can effectively replace the TBBS + PVI system in large-scale, thick natural rubber products. With their high molecular weight, elevated melting point, and superior thermal stability, they remain stable even when exposed to water. Additionally, they enhance the heat resistance and durability of steel cord-to-rubber adhesion, making them an ideal choice for demanding applications. |
| 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 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 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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