Determination of the permeation rate

  1. Hung dispersal packets in a controlled environmental chamber and gravimetrically monitored for weight loss.
  2. Calculate permeation rate = packet weight loss/elapsed time.
  3. Obtain and average multiple permeation rates for each packet. Burgett and Tremblay (1979) monitored three test packets for each compound and weighed each packet a minimum of 5 times.