Elcometer 2020 User Manual page 5

3 TEST PROCEDURE (continued)
1 Place the gauge on a flat, horizontal and non-slip surface, with
the zero mark on the scale closest to the user.
2 Place a suitable amount of the material in the deep end of each
groove.
3 Place the scraper on the surface of the gauge behind the
material. Use both hands to hold the scraper.
4 Pull the scraper along the length of the gauge at a constant
a
speed . Stop at a point beyond the zero depth. This operation
should take approximately 1 to 2 seconds.
5 View the drawn out material within the next 3 seconds. This avoids
inaccurate testing due to evaporation of the material. The material
should be viewed at right angles to the length of the groove and at
an angle of 20° to 30° with the surface of the gauge.
6 Elcometer 2020 and 2050: Find a band
across the groove(s) 3mm (1/8") wide which
contains 5 to 10 particles of the material.
Read the position of the upper limit of this
band on the scale and record this value.
Elcometer 2070: Find the first position in the
material where a given number of scratches
can be seen. Read the scale and record this
value.
7 Use a suitable solvent to clean the gauge and scraper.
8 Perform two more tests and calculate the average value of the
results. The average value is the fineness of grind of the
material.
a
Apply sufficient downward pressure to clean excess material from the edges of the gauge. Avoid the
formation of air bubbles.
b
A recommended method is to record 2 values: Position one - where there are 4 scratches, and Position
two - where there are 10 scratches.
en-3
R
b
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3 mm (1/8")