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| Name | Exterior view | Chemical composition | Complex carrier | Characteristics |
|---|---|---|---|---|
| First ZnEPDC (PX)-75 |  |
Chemical composition: Zinc ethylphenyl dithiocarbamate | Complex carrier: EPDM | Characteristics: A highly effective accelerator that is relatively safe to use with natural rubber, styrene-butadiene rubber, and nitrile rubber; it features a low critical vulcanization temperature and exhibits higher activity compared to thiazole accelerators. Vulcanization can be carried out at temperatures ranging from 80°C to 125°C, and it is also suitable for room-temperature curing. ZnEPDC-75 is non-polluting, does not cause discoloration, is odorless, tasteless, non-toxic, easily dispersible, and simple to weigh. It can be used in the production of products intended for food contact, as well as transparent and brightly colored items, medical devices, adhesive tapes, self-vulcanizing adhesives, and more. |
| 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 ZDEC (EZ)-75 |  |
Chemical composition: Zinc diethyl dithiocarbamate | Complex carrier: EPDM | Characteristics: A leading example of zinc dithiocarbamate salts, widely used as an ultrafast accelerator for both natural and synthetic rubber; it serves as an excellent activator when combined with thiazole- and sulfonamide-based accelerators. Adding small amounts of DM, TMTD, PVI, along with the antioxidant MB, can significantly enhance the storage stability of the rubber compound and delay vulcanization. This product is non-staining, does not cause discoloration, and is odorless, tasteless, non-toxic, and easily dispersible. It is particularly well-suited for white and brightly colored products, as well as transparent applications, and is primarily employed in the manufacture of tires, inner tubes, medical devices, adhesive tapes, and self-vulcanizing products. |
| 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. |
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