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By Smithers Rapra

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The basic data was measured using test slabs and dumbbells. All tests were performed under the same test conditions. This may cause a difference in comparing the data with the official TDS of the makers. (The accuracy is same as usual for all tests (last digit +/-1) and at EB up to +/-5%). During our development we made ACM-TPV materials of 70 ShA to 95 ShA by varying the ratio of elastomer phase to thermoplastic phase. The materials evaluated in the following tests had a hardness of about 80 ShA.

At concentrations above the percolation threshold the resistance approaches that of the pure additive (Fig. 1). Paper 5 – Christian Berg Page 4 of 6 pages TPE 2013 15-16 October, 2013 – Dȕsseldorf, Germany Figure 1: Specific resistance as function of carbon black concentration. It is very difficult to adjust the resistance of a material in the region of the percolation threshold (106 to 1014 Ωm) with a conductive additive since the resistivity is very sensitive to variations in concentration and homogeneity of the carbon black.

For media resistance we used hot air and engine/gear oil, up to 150°C was tested and results have been shown. Finally the basis physical parameters starting from tear resistance ranging from 2-8 N/mm, 10-15 MPa with 150300% Elongation. From this data, predictions can be made on the expected performance in actual applications. Therefore, likely applications might be bellows, pressurized oil hoses, grommets, air intake hoses, axle boots, specialty seals, ducts, etc. The present new material fulfills more of the required conditions in engine and gearbox sealing, housing and piping applications than other state of the art TPV resins.

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