ASTM D Standard Test Method for Specular Gloss. ASTM D Standard test method for specular gloss ASTM International offers global access to standards development for over participating countries. 21 มี.ค. แจก ASTM D, Standard Test Method for Specular Gloss. Link down load: ire 6he8e9czn. The customer isn’t.
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The gloss value for glass of any other refractive index can be computed from the Fresnel equation 5. In obtaining the visual gloss ratings, however, it is customary to compare the specular reectances of two specimens having similar surface refractive indices.
d5233-89 Six somewhat different appearance attributes are shown to be variously associated with gloss. If the disparity is still more than one unit, do not use the instrument without readjustment, preferably by the manufacturer.
With a at piece of polished black glass or other front-surface mirror in the specimen position, an image of the source shall be formed 6. 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 d5523-89 each geometry.
To measure the correction, illuminate the specimen perpendicularly and view at the incident angle with the receiver aperture specied in 6. Never place standards face down on a surface that may be dirty or abrasive. The geometry of angles and apertures is chosen so that asm procedures may be used as follows: Therefore, as many as six different photometric scales may be required to handle all gloss measurement problems.
However, in many applications the gloss scales of this test method have provided discriminations between coated specimens that have agreed well with visual discriminations of gloss NOTE 2—Polarization—An evaluation of the impact of polarization on gloss measurement has been reported The tolerances are chosen so that errors in the source and receptor apertures do not produce an error of more than one gloss unit at any point on the scale 5.
The American Society for Testing and Materials takes no position respecting the validity astk any patent rights asserted in connection with any item mentioned in this standard. Since specular reection is, in general, spectrally nonselective, spectral corrections need to be applied only to highly chromatic, low-gloss specimens upon agreement awtm users of this test method.
NOTE 5—For some types of paint, particularly semi-gloss, the measured gloss is affected by method of lm preparation and drying conditions so that the reproducibility of results from such materials may be poorer than the values given in Table 3. What difference in gloss can a human see? This standard has been approved for use by agencies of the Department of Defense.
The magnitude of the polarization error depends on the difference between the refractive indices of specimen and standard, the angle of incidence, and the degree of polarization. The original values can be restored by optical polishing with cerium oxide. This standard is also available to be included in Standards Subscriptions.
For means of three determinations. Cylindrical Mandrel Bend X523-89. Rhopoint IQ Flex Clean the standards in warm water and a mild detergent solution brushing gently with a soft nylon brush. A wedge of high-purity quartz provides a more stable reference standard than glass. The dimensions and tolerance of the source and receptor shall be as indicated in Table 1. Need more than one copy? DIN Germany Reflectometer as a means for assessing the specular gloss of smooth painted and plastic surfaces.
Please first verify your email before subscribing to alerts. How do I choose a Gloss Meter? Place the rinsed standards in a warm oven to dry.
แจก ASTM D523-89, Standard Test Method for Specular Gloss.
Your Alert Profile lists the documents that will be monitored. The axis of the incident beam and the axis of the receptor shall be within 0. Test Method E includes techniques for the measurement of both distinctness-of-image gloss and reection haze.
Your comments will receive careful consideration qstm a meeting of the responsible technical committee, which you may attend. You may delete a document from your Alert Profile at any time.
A number in parentheses indicates the year of last reapproval. This paper is out of print. For specimens with brush marks or similar texture effects, place them in such a way that the directions of the marks are parallel to wstm plane of the axes of the incident and reected beams.
Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. How is Gloss Measured?
ASTM D – 89() Standard Test Method for Specular Gloss
DIN Testing of paper and board; reflectometer as means for gloss Assessment of paper and board. Specifies the primary standard as black glass of refractive index 1. If the range is greater than two gloss units, take additional readings and d5238-9 the mean after discarding ashm results as in the section on Test for Outliers of Practice D Very similar to ISO Similar to ISO Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters.
For larger specimens, take a proportionately greater number of readings. Summary of Test Method 4. Contains photographs depicting gloss characteristics of a variety of methods. Always hold standards at the side edges to d523-9 getting oil from the skin on the standard surface.
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The values given in parentheses are for information only. Opacity and Shade Meter.