Wet Film Thickness Wheel
An accurate gauge to check the wet film thickness of a paint film on
application.This is a simple instrument which performs a very important job. The
thickness of any paint film is a critical factor affecting the eventual
performance of the finished scheme and must be carefully controlled. Too little
paint will result in premature breakdown of the film whilst too much paint would
be expensive. The wheel type gauge illustrated is an effective way of
determining the film thickness in the wet stage immediately after application.
A calibrated wheel with eccentric rim is rolled across the film to determine
thickness. Available in 4 standard ranges, 0-100µm, 0-200µm, 0-500µm, 0-1000µm.
The instrument has three rims, the inner rim being eccentric to the two outer
rims. At zero the three rims are in line; at any position the level of the inner
rim will be the scale distance below the plane of the outer rims.
Method of Use
Immediately after application of the paint, the Wet Film Thickness Gauge is
placed on the surface at the point where the gap between the inner and outer rim
is greatest. It is then rolled along until zero point, i.e. where the inner and
outer rims are in line, is in contact with the surface. Examination of the inner
rim will show a point at which pick-up of the paint began. The scale reading on
the outer rim shown against this point represents the Wet Film Thickness of the
The scaling of the gauges is now in microns and the following ranges are
Care must be taken to select the gauge with the appropriate range when
carrying out a test. Gauges conform with British Standard Specification BS. 3900
Part C5 / ISO 2808 – Method 7A, ASTM D1212 Method ‘A’.
We can supply calibration certificates if requested at the time of ordering.