Table 7.4. Directions For Preparing Simulated Fat And Bone Materials
For 915 and 2450 MHz (Guy, 1971a; Chou et al., 1984)
  1. Weigh all ingredients and determine percentages by weight.

  2. For a small quantity, place everything but the catalyst in a 1-qt round ice-cream carton with a fitted aluminum base and stir until blended. Use a small drill press as a stirring machine, a drill stand for 1/4 - and 3/4 - in. drills, a 1000-rpm 1/4-in. drill, a 2-in. shear stirrer, and a vertically oscillating-rotating table. The period of vertical oscillation and rotation is about 1 s. When the ingredients are blended, add the catalyst and continue stirring for 20 min.; then pour the mixture. For large mixtures, use a 4-in. shear stirrer, a larger (industrial size) drill press, a stainless-steel can 8 in. in diameter and 12 in. high, and a heavier vertically oscillating-rotating table. Table rotation is 40 rpm, and vertical oscillation 50 rpm.

  3. Coat molds with paraffin wax to ease removal. Due to internal heat, excess wax will melt and float on the model. After 3 h of setting, the models will be firm and can be removed from the molds. Machine the top and bottom of the final casting to remove air pockets and settled aluminum powder.