ASTM D523-89 PDF

Arashigore Because the specimen and standard are generally quite similar optically, measured gloss values are little affected by polarization. For small differences in refractive index, however, the gloss value is a linear function of index, but the rate of change of gloss with index is different for each geometry. To measure the correction, illuminate the specimen perpendicularly and view at the incident angle with the receiver aperture specied in 6. Subscription pricing is determined by: Six somewhat different appearance attributes are shown to be variously associated with gloss.

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More E Measurements by this test method correlate with visual observations of surface shininess made at roughly the corresponding angles. Since specular reflectance depends also on the surface refractive index of the specimen, the measured gloss ratings change as the surface refractive index changes.

In obtaining the visual gloss ratings, however, it is customary to compare the specular reflectances of two specimens having similar surface refractive indices.

Test Method E includes techniques for the measurement of both distinctness-of-image gloss and reflection haze. Test Method D provides an alternative procedure for measuring reflection haze. However, in many applications the gloss scales of this test method have provided instrumental scaling of coated specimens that have agreed well with visual scaling Scope 1.

The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

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Nezil Proceed to Checkout Continue Shopping. Part 28 Testing coated fabrics — determination of specular gloss. Do not use soap solutions to clean standards, because they can leave a lm. Pt 5, Method A Methods of testing plastics — optical and colour properties, weathering — determination of specular gloss.

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ASTM D523-89 PDF

Copyright ASTM Standard Test Method for Specular Gloss1 This standard is issued under the xed designation D ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense.

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