slurry formed was pumped through 4 u00d7 12 7 cm long 22 mm internal diameter connected tubes fitted with mesh at the outlet end the fluid flowed through the mesh leaving a pack of 20 40 proppant sand and novoloid fiber residual solution was then washed from the pack for 30 minutes using a flow of tap water the four tubes were then separated and a washer with a 1 27 cm diameter hole was fixed in position at one end of each of the four tubes water was then flowed through each tube exiting each tube at the end with the washer the flow rate was gradually increased until the sand fiber pack failed and the pressure drop across the tube and flow rate were recorded when the sand fiber pack failed the results from the four tubes were averaged the pack failed at an average flow rate of 5 3 liters min and an average flowing pressure drop of 46 psig across the tube the procedure of experiment i was repeated except that only three sand pack tubes were tested and no fibers were used the pack failed at an average flow rate of 0 35 liters min and an average flowing pressure drop of 0 75 psig across the tube the procedure of experiment i was repeated but the novoloid fibers used were 10 mm long by 15 microns in diameter the pack failed at an average flow rate of 3 7 1.