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| Name | Exterior view | Chemical composition | Complex carrier | Characteristics |
|---|---|---|---|---|
| First DPTT(TRA)-75 |  |
Chemical composition: Tetra(6)-thiobispentamethylene thiuram | Complex carrier: EPDM | Characteristics: Accelerators and vulcanizing agents for natural rubber and synthetic rubber—ideal as primary accelerators in CSM, SBR, and IIR. With an effective sulfur content of 18.75%, this product serves as a safe vulcanizing agent at processing temperatures, delivering superior heat resistance and aging performance in the cured rubber. When used in combination with thiazole-based accelerators, it is particularly well-suited for nitrile rubber, enhancing both compression set and thermal stability of the vulcanized compound. Compared to other dithiocarbamate accelerators, this product offers enhanced processing safety, higher cross-link density, reduced sulfur migration during curing, and improved overall thermal stability. |
| First TiBTD-75 |  |
Chemical composition: Tetrakis(isobutylthio)guanidine | Complex carrier: EPDM | Characteristics: Accelerator suitable for NR, IR, BR, SBR, IIR, NBR, and EPDM; exhibits no rubber staining, is easy to weigh and disperse, and leaves no contamination behind. Its performance closely resembles that of TT and TETD, while also ensuring nitrosamine-free vulcanization. It delivers excellent curing properties yet maintains low tensile strength. Even in sulfur-free formulations, it still provides strong vulcanization effects, along with superior heat resistance and zero foaming characteristics, resulting in products that are highly resistant to compression. |
| First TBTD-50 |  |
Chemical composition: Tetrabutyl tetrahydrothiuram disulfide | Complex carrier: EPDM | Characteristics: Used as a superaccelerator in both natural and synthetic rubber; the optimal vulcanization temperature ranges from 95 to 110°C, with high solubility in the rubber compound. When used in combination with TMTD, it helps minimize frosting while maintaining normal vulcanization activity. Additionally, TBTD boasts an effective sulfur content of approximately 7.5%, making it suitable as a curing agent in sulfur-based vulcanization systems. |
| First TETD-75 |  |
Chemical composition: Tetraethyl thiuram disulfide | Complex carrier: EPDM | Characteristics: Used as a superaccelerator in both natural and synthetic rubber; TETD offers better scorch safety compared to TMTD and is widely applied in rubber injection-molding products. It is commonly employed as an auxiliary accelerator for thiazole, guanidine, and aldimine-based accelerators. With an effective sulfur content of approximately 8.25%, TETD can also serve as a vulcanizing agent in sulfur-curing systems. When used in combination with TMTD, TETD helps minimize frosting while maintaining optimal vulcanization activity. |
| 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 TMTD (TT)-75 |  |
Chemical composition: Tetramethylthiuram disulfide | Complex carrier: EPDM | Characteristics: Acts as a superaccelerator for both natural and synthetic rubber; features an effective sulfur content of approximately 9.98%, making it suitable for use as a vulcanizing agent in low-sulfur and EV systems. It exhibits a critical vulcanization temperature of 100°C and is commonly employed—either as a primary or secondary accelerator—in diene rubbers such as NR, SBR, IR, BR, and NBR, often combined with CTP to enhance scorch safety in the compound. When used as a primary accelerator, it must be paired with zinc oxide and stearic acid; alternatively, it frequently serves as a secondary accelerator alongside thiazole-based accelerators. Additionally, it can be integrated into continuous vulcanization systems when combined with other accelerators. It also functions as a scorch retardant for non-sulfur-modified chloroprene rubber (CR). |
| First TMTM(TS)-80 |  |
Chemical composition: Tetramethylthiuram monosulfide | Complex carrier: EPDM | Characteristics: Used as an ultrafast vulcanization accelerator in both natural and synthetic rubber; its critical vulcanization temperature is approximately 121°C, and it exhibits about 10% lower vulcanization activity compared to TMTD, while offering excellent scorch safety. Additionally, it imparts outstanding anti-aging performance in low-sulfur vulcanized products. It can be used alone, though its activity can be enhanced when combined with guanidine or aldehyde-amine compounds. Typically, it serves as a secondary accelerator alongside thiazoles and sulfonamides. It is also suitable for use as a scorch-delaying agent in non-sulfur-modified chloroprene rubber (CR). |
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