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TAPPI T 653 Gloss (20°)

Standard:

TAPPI

Method:

TAPPI T 653

Title:

Specular gloss of paper and paperboard at 20 degrees

Scope

TAPPI T 653 Gloss is for the measurement of the specular gloss of high-gloss papers at 20° (70° from the plane of the paper).

This method is suitable for high-gloss coated, cast-coated, lacquered, highly varnished or waxed papers, and high-gloss ink films. For the measurement of low- to moderate-gloss coated and uncoated papers and low- to moderate-gloss ink films, TAPPI T 480 “Specular Gloss of Paper and Paperboard at 75 Degrees” is preferred. Neither method is a measure of image reflecting quality.

Summary

This method involves the measurement of reflectance using a scale on which a polished black glass with a refractive index of 1.540 measures 100 units. The angles of incidence and reflectance are each 20°, the receptor or viewing window is round and its diameter subtends an angle of 5° with respect to an apex at the center of the illuminated area in the plane of a specimen opening. These geometric conditions establish a gloss scale which provides optimum discrimination for high gloss papers.

Significance

This method gives good correlation with visual gloss or shininess provided the sample is flat. The degree of correlation decreases as the sample deviates from being flat.

 

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