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