Figure 4 . - - Weighing 

 drying pan. 



TESTING PROCEDURE 

 Drying Test 



To determine the drying rates of the various retardants, each sample was weighed at 15- 

 minute intervals until it was essentially dry. The results were then plotted as drying curves. 



Nine runs were made, each with 18 treated samples: 



Variable Number of treatments 



Chemicals, including water 6 



Environments x3 



Application amounts x3 



Replications *3 



Total samples 162 



Before running any tests, we positioned a 20-compartment rack across the wind tunnel 

 test section to expose the treated pans to the environmentally conditioned airflow. The treat- 

 ment sequence and order of placement in the rack were determined by random number selection 

 before the test series began. 



Figure 5. --Weighing 

 burning tray. 



