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Unusual rubber formulations - A case study: High hardness EPDM

SpecialChem / Apr 7, 2004

EPDMs are generally used for the fabrication of rather soft goods ranging from 25 to 75 Shore A. Off the limits of the usual EPDM goods, is a growing demand of high hardness EPDM vulcanizates with Shore A of 80 and more or Shore D of 25 and more. One of the most important applications is the replacement of thermoplastics, thermosets and metals with high hardness rubbers of sufficient rigidity that brings: * Damping * Vibration absorption * Low noise transmission * Good sealing properties * Low and high temperature behaviours. High hardness profiles can be co-extruded and co-cured with soft profiles to ensure rigidity of the final profile. Highways for high hardness Theoretically, there are several simple routes (see Figure 1) but practically one hits a severe snag, the processing difficulty. Simple ways are: * Decrease or removal of plasticizers, processing aids and so on. * Use of high loading levels of low particle size carbon blacks and/or mineral fillers. * Use efficiency vulcanizing systems with high sulphur or peroxide level to make a dense network or semi-ebonite.

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