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NIST Traceable Scratch Dig Standards

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.

Technical Information

Plate 1
Grade No. Circ. Diameter (μm) Dim. of Scratch (μm) Freq. Block (lp/mm) Grid Block Line W (μm) Grid Block Line Spacing (μm)
0.004 4.5 1 x 16 500 1 4.5
0.006 7 1.6 x 25 312.5 1.6 7
0.010 11 2.5 x 40 200 2.5 11
0.016 18 4 x 63 125 4 18
0.025 28 6.3 x 100 80 6.3 28
0.040 45 10 x 160 50 10 45
Plate 2
Grade No. Circ. Diameter (μm) Dim. of Scratch (μm) Freq. Block (lp/mm) Grid Block Line W (μm) Grid Block Line Spacing (μm)
0.040 45 10 x 160 50 10 45
0.060 70 16 x 225 31.25 10 70
0.100 110 25 x 400 20 10 110
0.160 180 40 x 630 12.5 10 180
0.250 280 63 x 1000 8 10 280
0.400 450 100 x 1600 5 10 450

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