TAPPI SEC - Size Estimation Chart (Transparent)

The TAPPI Size Estimation Chart is a transparent chart used to measure the size of spots, defects, or inclusions over the range of 0.02 to 5.00 square millimeters in paper and other industrial materials such as textiles or plastics. Instructions for use of this transparency are outlined in TAPPI Test Method T 564. The chart can be used in a large number of applications where there is a need to estimate a size (area) by way of a direct comparison to a known circular area. A must for quality inspection professionals, these charts serve as quality assurance resources to determine the size of imperfections in the following applications.





Measure the size of defects in products


Inspect third-party packaging


Determine the size of imperfections in molded plastic products and medical tubing


Detect embedded specs


Measurement of visible ink spatter on printed surfaces


Estimation of the growth rate of bio-colonies


Detect air inclusions in transparent plastic castings and films








Consider the Calibrated Size Estimation Charts for quality assurance processes that require more exact measurement. This is the same transparent chart; however, it has been calibrated by an ISO-certified manufacturer. Each calibrated chart has 23 dots that are measured and documented within the specified tolerances and are exported to a Data Sheet with a unique serial number corresponding to the chart.