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T (in-lb)
1.5 × L (in.) × W (in.)
EP Block – Good Seizure Scarring
2. To calculate the pressure on the block:
a. Compute the total area of the scar on the block. Multiply the width of
the scar (in inches) by the length of the scar (in inches). If the scar is
trapezoidal in shape, use the average width of the scar.
b. Calculate the force acting on the scar area. Divide the torque meter
dial reading (in inch pounds) at which a Pass was obtained by 1.5 (1.5
is the travel distance of the arm).
c. Calculate the pressure on the test block at the time the test was
stopped. Divide the force acting on the scar (B above) by the area of
the scar (A above). This pressure is the lm strength of the uid.
In equation form it is as follows:
P =
Where:
P = Film Strength (psi)
T = Torque Meter Dial Reading (in-lb)
W = Scar Width (inches)
L = Scar Length (inches)
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