When using lightweight fillers you will see that you run at a higher resin percentage. You will also seem to have a lower maximum output. The appearance of this is a little misleading, here is why. For the purpose of demonstrating the effects we'll us an AutoCaster but the same symptoms are experienced using other methods. The Autocaster displays and measures material in pounds but now your using a material that is lighter giving less weight at the same volume. With the overall weight being lighter for the same volume the percentage of total weight that is resin will be higher even if the same amount of resin by volume is used. The fact that the material is lighter also means that your max output although it's the same amount in volume is now less in weight (Lbs/Min).

Here is an example using typical material amounts.

		All Cal Carb		50% Lightweight (vol)
Item	Motor Speed	Pct.	Weight	Pct.	Weight
Resin	30	19.34	12.9	29	12.9
Filler 1	23	50	26.9	15	4.71
Filler 2	23	50	26.9	85	26.9
Total Lbs/Min			66.7		44.51

This example demonstrates the diference between All Cal Carb and 50% Lightweight by volume running on a 2 hopper AutoCaster. As you can tell from the motor speeds and resin weight the same amount of material is dispensed in each case and although the resin percentage rose from 19.34% to 29% the actual amount of resin is still 12.9 Lbs/Min. Filler hopper # 1, although running at the same rate of 23% of full motor speed is now dispensing only 4.71 Lbs/Min instead if 26.9 Lbs/Min. This difference is due to the lighter material so the volume remains the same. As shown by the total Lbs/Minute a machine producing 44.5 Lbs/Min with 50% lightweight is filling your moulds at the same rate as a machine using only Cal Carb at 66 Lbs/Min.