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First Rubber MAC-1489 is a highly effective anti-yellowing accelerator masterbatch on EPDM carrier. Specifically designed for white and light-colored rubber goods, it delivers outstanding yellowing resistance, achieving grades 4.0 to 5.0 under stable formulation conditions. The product offers a moderate vulcanization speed, with wear resistance, tensile strength, and tear resistance comparable to standard accelerator systems. MAC-1489 is non-staining and non-discoloring, ensuring consistent color stability throughout the product's life. A key advantage is its excellent scorch resistance, allowing compounded rubber to remain stable at room temperature for 3-5 days—overcoming a common limitation of conventional yellowing-resistant accelerators. Recommended dosage: 1.0-3.0 phr with 0.5-2.5 phr sulfur.
First Rubber EM33-75 is a pre-dispersed composite accelerator masterbatch specially formulated for ethylene propylene diene monomer (EPDM) compounds. As a comprehensive accelerator, it eliminates the need for complex blending of multiple single accelerators, simplifying the mixing process and reducing the risk of compounding errors. EM33-75 offers an excellent balance of fast cure speed, long scorch time, and outstanding vulcanization flatness. Its non-blooming, non-staining, and low-odor characteristics make it particularly suitable for light-colored and white rubber goods such as automotive weather seals, hoses, gaskets, and shoe soles. The pre-dispersed masterbatch form ensures dust-free handling, excellent dispersion, and consistent performance. Recommended dosage: 2.0-3.5 phr.
Yellowing ruining your white or light‑colored rubber exports? First® MAC‑1489 is a high‑efficiency anti‑yellowing accelerator masterbatch. Delivers yellowing resistance grade 4.0–5.0, moderate cure speed, excellent scorch safety (3–5 days storage), non‑staining. Perfect for shoe soles, sidewalls, seals, toys.
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