Developed from and based on the TAPPI Dirt Estimation Chart, this custom transparency is 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 area disk or rectangle. Applications may include, but are not limited to, the measurement of visible ink spatter on printed surfaces, the estimation of the growth rate of bio-colonies, air inclusions in transparent plastic castings and films, etc. The chart must NOT be used to estimate the equivalent black area (EBA) of dirt or other colored specks (use the TAPPI Dirt Estimation Chart in conjunction with T 213 or T 437 or use image analysis, T 563, for EBA measurement).

The charts are manufactured from an original negative produced on DuPont CRR film. A rapid-access processor using Kodak/Fujifilm chemistry is used for processing the transparencies. Each film positive is produced on Kodak Contact 2000 CA7 film, using a NuArc contacting frame with a NuArc light source and built-in integrators which control the exposure.

What makes a Calibrated Size Estimation Chart so special?

• These charts are ideal for quality assurance processes that require more exact measurement.
• Each chart has 23 dots that are calibrated using both a microscope and the industry measurement standard (NIST traceable reticule). It has been prepared with consistency and precision.
• Each Calibrated SEC comes with its own data sheet that provides an actual dot measurement area (expressed in squared mm) to correspond with the increments (dots) on the chart.
• Each Calibrated SEC is individually prepared and bears a tamper evident security hologram with its own serial number to assure authenticity to users.

What it can mean for you:

• You no longer have to calibrate your own charts. You can save time and effort!
• You can feel confident knowing that the each Calibrated Size Estimation Chart is prepared with care and precision to allow you to better serve your customers.