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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This standard has been approved for use by agencies of the Department of Defense. NOTE 2—Polarization—An evaluation of the impact of polarization on gloss measurement has been reported Do not use soap solutions to clean standards, because they can leave a lm.
The following are technically similar to ISO Part 28 Testing coated fabrics – determination of specular gloss. 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.
The angular dimensions of the receptor eld stop are measured from the receptor lens in a collimated-beam-type instrument, as illustrated in Fig. D532-89 dimensions and tolerance asm the source and receptor shall be as indicated in Table 1. Please first verify your email before subscribing to alerts. The axis of the receptor shall be at the mirror reection of the axis of the incident beam.
Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. This does not include variability due to preparation of panels in different laboratories.
แจก ASTM D523-89, Standard Test Method for Specular Gloss.
Rhopoint IQ Flex Therefore, as many as six different photometric scales may be required to handle all gloss measurement problems. Because the specimen and standard are generally quite similar optically, measured gloss values are little awtm by polarization. Please first log in with a verified email before subscribing to alerts.
This standard is subject to revision at any time by the responsible technical committee wstm must be reviewed every ve years and if not revised, either reapproved or withdrawn.
Gloss Introduction – Page 5 What is Gloss? Cone and Plate Viscometer. Gloss Meter for Curved Surfaces. To apply the correction, 3 Sold to: Since the instrumental ratings are affected more than the visual ratings by changes in surface refractive index, non-agreement between visual and instrumental gloss ratings can occur when high gloss specimen surfaces differing in refractive index are compared.
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. Measurements by this test method correlate with visual observations of surface shininess made at roughly the corresponding angles.
Pt 5, Method A Methods of testing plastics – optical and colour properties, weathering – determination of specular gloss. Subscription pricing is determined by: The original values can be restored by optical polishing with cerium oxide. Has unusual converging beam geometry. 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 Since specular reectance depends also on the surface refractive index of the specimen, the measured gloss ratings change as the surface refractive index changes.
The values given in parentheses are for information only. This paper is out of print. Six somewhat different appearance attributes are shown to be variously associated with gloss. Need more than one copy?
To measure the correction, illuminate the specimen perpendicularly and view at the incident angle with the receiver aperture specied in 6. You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. D523-9 Standards, Vol 18, No.
The geometric conditions of test later incorporated in Test Method D are recommended. 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 astn materials may be poorer than the values given in Table 3.
The luminous ux entering the receiver aperture from the perfect white diffusor would give the following astj indications for each of the geometries: Signicance and Use 5. We have no amendments or corrections for this standard.
Squares with sides equal to the shorter sides of the rectangles are also recommended. Preparation and Selection of Test Specimens 8.
Summary of Test Method 4. Very similar to ISO You may delete a document from your Alert Profile at any time.
ASTM D – 89() Standard Test Method for Specular Gloss
The gloss value for glass of any other refractive index can be computed from the Fresnel equation 5. Since specular reection is, in general, e523-89 nonselective, spectral corrections need to be applied only to highly chromatic, low-gloss specimens upon agreement of users of this test method.
A comparison is made of several geometrically different photometric scales for separating paint nishes for gloss. The data are analyzed by multidimensional scaling. What difference in gloss can a human see? History of Test Method D Such standards should be checked periodically for constancy by comparing with primary standards. Similar to ISO Already Subscribed to this document.
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