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| Name | Exterior view | Chemical composition | Complex carrier | Characteristics |
|---|---|---|---|---|
| First ZDBC (BZ)-75 |  |
Chemical composition: Zinc dibutyl dithiocarbamate | Complex carrier: EPDM | Characteristics: Accelerator for both natural and synthetic rubber—exhibiting higher activity and solubility compared to ZDEC, making it ideal for vulcanization temperatures between 90°C and 110°C. It serves as an excellent activator when used alongside thiazole-based accelerators, enhancing the aging resistance of vulcanized rubber. Additionally, it remains colorless, non-polluting, and easily dispersible—perfect for applications requiring high transparency or light-colored rubber products. |
| First ZDMC (PZ)-75 |  |
Chemical composition: Zinc dimethyldithiocarbamate | Complex carrier: EPDM | Characteristics: Natural rubber and synthetic rubber ultra-accelerators—specifically designed for butyl rubber, which demands excellent resistance to compression set, and nitrile rubber, known for its outstanding aging resistance. Also suitable for use with ethylene propylene diene monomer (EPDM) rubber. Commonly employed as a secondary accelerator in combination with thiazole and sulfonamide accelerators. When used in tandem with DM, the scorch resistance improves significantly as the amount of DM increases. It features easy dispersion, precise dosing, is odorless, non-staining, and does not cause discoloration. Additionally, this product has been approved by the FDA in the U.S., making it ideal for applications in adhesive tapes, as well as food and pharmaceutical-grade rubber products—particularly suited for producing transparent, light-colored, and vibrant-hued rubber articles. |
| First HMMM-50 |  |
Chemical composition: Hexamethoxymethylmelamine | Complex carrier: EPDM/SBR | Characteristics: In the "meta-methyl white (HRH)" system, the rubber adhesive reacts with methylene acceptors at vulcanization temperatures, effectively bonding rubber and reinforcing materials. When used as a curing agent, it reacts with non-reactive phenolic resins to form thermosetting resins, significantly enhancing the rubber's strength, modulus, hardness, and tear resistance. Compared to HMT, this product is more environmentally friendly, with extremely low formaldehyde content. |
| First HMT(H)-80 |  |
Chemical composition: Hexamethylenetetramine | Complex carrier: EPDM/SBR | Characteristics: A slow, weak accelerant for rubber, often used as a secondary accelerator; it has a critical vulcanization temperature of 140°C—below this temperature, its activity is very poor, but it poses minimal scorch risk. Zinc oxide enhances its effectiveness, while clay and carbon black tend to inhibit it. The compound disperses easily in rubber compounds without causing contamination or discoloration. It is primarily used in the production of light-colored, transparent, and thick products. Additionally, when combined with HMT, resorcinol, and white carbon black to form the "Meta-White (HRH)" system, it significantly boosts the adhesion strength between rubber and fibrous materials. |
| First MTT-80 |  |
Chemical composition: 3-Methyl-2-thiazolethione | Complex carrier: EPDM/SBR | Characteristics: This product is an environmentally friendly accelerator based on a thiazole heterocyclic compound, containing active sulfur atoms that induce crosslinking in halogen-containing polymer materials. It is particularly well-suited for use in chlorinated butyl rubber and chloroprene rubber, serving as a highly effective accelerator specifically for chloroprene rubber. Compared to ETU, it retains the excellent physical properties and superior aging resistance characteristic of ETU-cured chloroprene rubber, while also enhancing scorch resistance and improving processing safety. Additionally, it offers a faster vulcanization rate without compromising overall performance. |
| 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 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 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. |
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