Ebonite media

Ebonite media are manufacmred from partially vulcanized rubber, which is crushed, pressed and vulcanized. These media are resistant to acids, salt solutions and alkalies. They may be used for filtration at temperamres ranging from -10 to + 110 C. 

The reaction medium consists of molten sulfur/accelerator (N,N-dicyclohexyl-2-benzo-thiazolylsulfenamide)/zinc stearate in the weight ratio 90/5/5. Small pieces of the cord are cut from the tire carefully trimming some of the rubber but leaving a thin, undisturbed surface layer. Eight hours are required for the reaction at 120°C. Samples are removed, scraped off and placed in a 120°C oven to remove the excess ebonite. The treated cords are embedded and sectioned with a diamond knife to reveal the interfaces that relate to the adhesive coating and the tire cord adhesion. The fiber-RFL-rubber interfaces are all observed in the tire cord cross section (Fig. 4.14). A more complete description of this type of study is described in Chapter 5. 

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