Abstract
The relative effects of changes in temperature, pressure and weight percentage filler on ultrasonic velocity through static samples of magnesium hydroxide filled low density polyethylene (LDPE) melt have been determined for a range of temperatures and pressures. Ultrasonic velocity was found to be most sensitive to change in temperature and least sensitive to change in pressure. Using these data and data obtained during extrusion of unfilled LDPE, the amount of magnesium hydroxide present (weight percentage) in LDPE was determined. Values of weight percentage calculated from extrusion data were compared with values obtained from the thermogravimetric analysis of extrudate. Variations in weight percentage of filler between the two sets of data followed the same trend with time of extrusion.
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