Vulcanizing Agents (Activators) for Plastic Compounds

Casilane HP-669 by Thomas Swan is a sulphur silane coupling agent. It acts as a chemical intermediate and crosslinking agent. It also acts as a vulcanizing agent and activator in the rubber industry due to the presence of four sulphur atoms in its structure.

• It enhances performance by incorporating fillers like silica, fiberglass, talc, mica, and clay, boosting filler–rubber interaction to increase abrasion resistance and overall durability.
• It is suitable for use in NR, IR, SBR, BR, NBR, and EPDM rubber compounds.
• It features poly-sulphidic alkyl structures that align with sulphur deoxidation rates, resisting oxidative degradation while improving heat resistance and crack fatigue performance.
• It reduces puncture risk, rolling resistance, fuel consumption, and carbon-dioxide emissions, supporting carbon reduction efforts and ensuring environmental compliance.
• It acts as a reinforcing agent, enhancing filler performance and significantly improving rubber’s abrasion resistance.
• Casilane HP-669 boosts cut and pressure resistance while reducing hysteresis loss and moisture absorption, thereby enhancing mechanical strength, adhesion, thermal aging resistance, modulus, and flex life.
• It strengthens the bond between substrates and adhesives or coatings, resulting in products that are more durable, reliable, and long-lasting.
• It enhances mechanical properties like tensile strength, modulus, and elongation, making materials tougher, more flexible, and resilient.
• It improves chemical resistance, increasing stability, consistency, and product lifespan.
• It is used in the manufacturing of tires, hoses, rollers, belts, cables, footwear, and molded rubber parts.
• Recommended dosage is 1.0-4.0 PHR.
• It has a shelf life of over 2 years.

Dynamar™ RC 5251Q by 3M is sodium carbonate cure activator and acid receptor for ECO compounds. It is used as part of a cure system for vulcanizing polyepichlorohydrin elastomers. This additive provides excellent scorch resistance, significant rheological flexibility, good heat aging and good compression set resistance. Dynamar™ RC 5251Q is used in veneer fuel and filler hose constructions. Recommended for rubber and plastic industry.

Luperox® DCP by Arkema acts as a polymerization initiator, vulcanizing and crosslinking agent. It is dicumyl peroxide (DCP). It is compatible with thermoplastic elastomer vulcanizates, polypropylene and expandable polystyrene.

• It is suitable for use as finisher and as synergist for fire retardant EPS applications.
• Luperox® DCP can be processed at temperatures up to 250°F (121°C) and can be cured at temperatures above 300°F (149°C).
• It is recommended for general & renewable energy applications such as wire and cable.

ZOCO 104 by Zochem acts as a mixed metal stabilizers (Ba/Zn and Ca/Zn) for PVC plastisols and also as an activator in the vulcanization or curing process. It adds strength to rubber compounds, improves their resistance to heat and abrasion and helps guard against ultraviolet degradation. It is a fine white odorless powder with high purity as well as it is excellent for applications where low surface area reactivity intermediate to ZOCO 103 and ZOCO 100 is required. ZOCO 104 is recommended for tire, resins and most general rubber applications. For rubber, it is used in food, pharmaceutical and other specialized applications.

STRUKTOL® Aktivator 74 by Struktol is a vulcanization activator. It is a blend of zinc soaps of aliphatic and aromatic carboxylic acids. This cure additive is used in sulfur cure systems in many diene rubbers. When used in NR containing compounds an increased reversion resistance is obtained. It improves physical properties results in higher state of cure and increased modulus. It has a beneficial influence of dynamic properties, lower tan delta has been observed and a reduced heat build up on flexing due to better resistance to reversion may be obtained. It enhances processability, improves flow properties in NR containing compounds. It is also an effective peptizer for the mastification of natural rubber. It can partly or totally replace conventional activators based on fatty acids like stearic acid, zinc stearate, and zinc 2-ethylhexanoate. Recommended dosage level is 2-4 phr. The shelf life of STRUKTOL® Aktivator 74 product is 24 months.

STRUKTOL® Activator 73 A by Struktol is a multifunctional cure activator. It is a mixture of zinc salts of aliphatic and aromatic carboxylic acids. It is effective for the sulfur vulcanization of diene rubber, especially natural rubber. STRUKTOL® Activator 73 A can partly or totally replace conventional activators based on fatty acids, e.g., stearic acid, zinc stearate, and zinc 2-ethylhexanoate. It offers prolonged reversion time, higher modulus, less heat buildup under dynamic load and reduced compression set at elevated temperatures. It provides improved properties at high-temperature cures and viscosity reduction at high shear. It is used as an effective physical peptizer for the mastication of natural rubber. It improves processability in mixing, extrusion and molding. Recommended dosage level is 2-5 phr, in combination with 2-5 phr zinc oxide. The shelf life of this product is 2 years.

STRUKTOL® ZEH-DL by Struktol is an activator for rubber. It is a dry liquid of STRUKTOL® ZEH. This free flowing powder is used for masticating natural rubber. STRUKTOL® ZEH-DL can partly replace stearic acid in synthetic rubber like SBR and NBR. Recommended dosage level is 1.5-4.5 phr. The shelf life of this product is 2 years.

STRUKTOL® Activator 73 LM by Struktol is a multifunction cure activator for the sulfur vulcanization of diene rubber, especially natural rubber. It is a mixture of zinc salts of aliphatic and aromatic carboxylic acids. It offers improved properties at high temperature cures, viscosity reduction at high shear, higher modulus and less heat buildup under dynamic load. STRUKTOL® Activator 73 LM provides prolonged reversion time and reduced compression set at elevated temperatures. It can partly or totally replace conventional activators based on fatty acids, e.g., stearic acid, zinc stearate, and zinc 2-ethylhexanoate. It is an effective physical peptizer for the mastication of natural rubber. It improves processability in mixing, extrusion and molding. It is designed for low shear and low temperature mixes. Recommended dosage level is 2-5 phr, in combination with 2-5 phr zinc oxide. The shelf life of this product is 2 years.

STRUKTOL® ZEH by Struktol is zinc 2-ethylhexanoate-based activator for natural rubber. It reduces stress relaxation and primary creep of NR-vulcanizates, especially in combination with soluble EV-systems. STRUKTOL® ZEH offers heat stability (reversion resistance) in natural rubber compounds containing normal levels of sulfur, particularly with thiazole accelerators. It is used for masticating natural and synthetic rubber. It can partly replace stearic acid in synthetic rubber like SBR and NBR. Tensile strength and elasticity can be achieved caused by the good dispersion of the soluble activator. The recommended dosage level is 1-3 phr. The shelf life of this product is 2 years.

Rhenofit® D/A by Rhein Chemie Additives (Lanxess Group) is a vulcanization activator for polychloroprene rubber. It improves the processing safety of CR-, CSM-, CM- and CIIR-based rubber compounds by raising the critical temperature of basic accelerators. It reduces the tendency of rubber compounds to scorching, while it lowers the necessary activation temperature for acid accelerators. In polymers containing halogen, it acts as an acid acceptor, thereby enhancing aging properties. Rhenofit® D/A increases moduli and in cold-cured fabric proofing, it serves to neutralize traces of acid. It is applied in extruded and injection molded technical articles, bladders, roofing and compounds with chlorinated paraffin, cork and sulfur chloride factice (erasers, swimming caps and rubberized sheets). Recommended dosage level is 3-5 phr and has a shelf life of 1 year.