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NIST Traceable Scratch Dig Standards

NIST Traceable Scratch Dig Standards

These Surface Quality standards are ideal for qualifying the scratch and dig surface defects on optical components. In addition to the Scratch Dig markings, there is a 60mm scale, 6 grids varying in size and 6 blocks of lines with varying frequencies on each plate. The grids can be used to measure the area of irregularly shaped defects. The square root of the total defect area for a region is the grade number for that region. The standards are offered as sets of two plates. Plate 1 includes grade numbers ranging from 0.004 to 0.040 while Plate 2 includes 0.040 to 0.400. The first surface sets have the features marked on the top of the glass substrate. The second surface set has the features marked on the bottom of the glass substrate. The features on the positive set are opaque on a clear background. The features on the negative set are clear on an opaque background.

Note: Certificate of Compliance is included with each product.

Common Specifications

Scale Divisions:
Every 0.025
Substrate:
Float Glass
Scale Length (mm):
60 ±0.002
Surface Flatness:
3 - 4λ
Thickness (mm):
1.5

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