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| Name | Exterior view | Chemical composition | Complex carrier | Characteristics |
|---|---|---|---|---|
| First DBTU-75 |  |
Chemical composition: N,N'-Dibutylthiourea | Complex carrier: EPDM/SBR | Characteristics: This product is a fast-acting vulcanization accelerator specifically designed for chloroprene rubber, and it also enhances the curing process of natural rubber, styrene-butadiene rubber, butyl rubber, and ethylene-propylene-diene monomer (EPDM) rubber. DBTU exhibits performance comparable to ETU and DETU, making it ideal for rubber compounds cured at lower temperatures—resulting in products with superior physical properties. Additionally, DBTU provides moderate ozone resistance in various types of rubber, including natural rubber, chloroprene rubber, nitrile rubber, and styrene-butadiene rubber, making it suitable for use as an anti-ozonant additive. |
| First DPTU(CA)-75 |  |
Chemical composition: N-N'-Diphenylthiourea | Complex carrier: EPDM/SBR | Characteristics: Fast vulcanization accelerator for natural rubber and neoprene products; critical vulcanization temperature is 80°C—during mixing, care must be taken to prevent premature curing, as the product becomes highly active above 100°C. The resulting materials exhibit exceptional toughness, with excellent tensile strength and flex resistance, though they may undergo discoloration when exposed to light. It is also used as a heat stabilizer in emulsion polymerization of polyvinyl chloride, making it particularly suitable for soft PVC products. However, it should not be combined with stabilizers like lead or cadmium, as this could lead to discoloration of the final product. |
| First DETU-75 |  |
Chemical composition: Diethylthiourea | Complex carrier: EPDM/SBR | Characteristics: Chloroprene rubber exhibits unique vulcanization properties, resulting in products with minimal compression set and excellent aging resistance. In non-sulfur-modified chloroprene rubber vulcanization systems, it typically delivers superior curing performance when used in combination with zinc oxide and magnesium oxide. Additionally, it serves as an effective accelerator for butyl rubber and a vulcanizing activator for EPDM rubber. It also provides antioxidant protection for NR, CR, NBR, and SBR. While it can be activated by accelerators like ZDC and salicylic acid, DM and TMTD tend to inhibit its activity. In NR and SBR, it effectively enhances the activation of thiazole- and sulfonamide-based accelerators. At higher dosages, it enables rapid, high-temperature vulcanization, making it particularly well-suited for the continuous production of extruded rubber products. |
| First ETU (NA-22)-75 |  |
Chemical composition: 1,2-Ethylenethiourea (Ethylene Thiourea) | Complex carrier: EPDM/SBR | Characteristics: A general-purpose accelerator for halogenated rubber products such as CR, CSM, and CPE. In non-sulfur-modified chloroprene rubber vulcanization systems, zinc oxide and magnesium oxide are typically used as vulcanizing agents, often combined with this product to achieve superior curing performance. For low-sulfur or sulfur-free vulcanization of other diene rubbers, it can serve as both an activator and a secondary accelerator. |
| 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 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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