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First EM33-75
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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.
Product Categories:
Accelerator
Comprehensive Promoter
Keywords:
- Chemical composition: EPDM Comprehensive Accelerator
- Complex carrier: EPDM
- Characteristics: A comprehensive accelerator specifically designed for EPDM, offering high vulcanization efficiency and excellent vulcanization flatness. It can be used alone or combined with ZDBC and ZDEC for even faster curing rates. This product is non-staining, does not cause discoloration, and disperses easily, making it ideal for white or light-colored rubber products. It is commonly employed in EPDM-based sealing strips, hoses, molded components, and other similar applications.
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- Product Description
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What is the most frustrating thing in EPDM compounding? Blooming. You spend hours fine‑tuning the colour, and a few days later a white powder appears on the surface. Customers reject it. EM33-75 was developed specifically to solve this problem. It is not a single accelerator. It is a composite blend of accelerators and auxiliaries, pre‑dispersed in an EPDM carrier as a masterbatch. Used in EPDM compounds, the biggest advantage is: no blooming, non‑staining, and low odour. Light‑coloured, white, and coloured products can be made without worrying about surface whitening or discoloration. Scorch safety is also much better than conventional systems. Mixed compounds can sit at room temperature for 3–5 days and still be perfectly usable for moulding or extrusion. This gives manufacturers real flexibility in production scheduling. Cure speed is moderate, with good vulcanisation flatness. Abrasion resistance, tensile strength, and tear strength are comparable to traditional accelerator systems — no sacrifice on performance. Typical dosage is 2.0–3.5 phr, together with an appropriate amount of sulphur. EM33-75 is mainly used in automotive weather seals, hoses, gaskets, shoe soles, and roofing membranes. The granule form is dust‑free, easy to weigh, and suitable for automated feeding lines. If you have ever struggled with blooming, or if you want to simplify your EPDM formulation and reduce the number of accelerator types, EM33-75 is well worth trying. Typical reference data: - Product type: EPDM‑specific composite accelerator masterbatch - Carrier: EPDM / EVA - Appearance: Light yellow to grey‑white granules - Key features: Non‑blooming, non‑staining, low odour, good scorch safety - Recommended dosage: 2.0–3.5 phr (as primary accelerator) - Packaging: 25 kg paper bag or carton with inner PE liner - Storage stability: 12 months in unopened packaging under cool, dry conditions Samples and technical data sheets are available. No hard selling — just for your evaluation.
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