ASTM D(). Standard Test Method for Fineness of Dispersion of Pigment-Vehicle Systems by Hegman-Type Gage. standard by. ASTM D(细度) – Designation: D – 05 (Reapproved ) Standard Test Method for Fin. ASTM D Fineness of Dispersion of Pigment-Vehicle. Systems. Test Specimen At least grams of uniformly mixed solder paste. Equipment/.
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Calculate the texture cleanliness of the material using the following formula that weights the coarse fraction 3-mil side of gage 4 times heavier than the ne fraction 1-mil side. D — 05 1-in. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn. Average the two readings to the nearest 14 Hegman units 5 m.
No further reproductions authorized. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. The two depths will be 3 mils, and 1 mil, or as agreed upon between the buyer and the seller. NOTE 5—For this test method to function properly, the pigment particles in the specimens to be tested should be free to settle to the bottom of the gage channel after the drawdown.
There are 2 delimited sections on this gage, each of 6.
ASTM D – Zehntner GmbH
It is preferable to scan from the shallow end toward the deep end, since this allows the operator to just decide when the dense pattern breaks, rather than trying to decide whether Copyright by ASTM Int’l all rights reserved ; Sun Jul 4 Permission rights to photocopy the standard may also be secured from the ASTM website www.
Reduction should be in approximately the same proportion as the intermediate will be reduced in practice. This test method describes a way of making this judgment.
Keeping the gage between the operator and the light source, make the angle between the face of the gage and the line of vision so that the image of the uorescent tube appears in the material on the gage. NOTE 1—Several arbitrary scales and modications of the gage are used by industry. Any light coming through between scraper and gage face shows that the scraper has been damaged and is not satisfactory for use. Within 10 s of placing the specimen on the gage, make a reading as follows: NOTE 6—Clear nishes may have to be viewed at a lower angle or they may have to be opacied with a nely ground colorant or dye in order to see the particles better.
This average is considered one reading. Keep the gage covered or encased at 2 5. This process allows the two test readings to be made with limited time lapses between completion of drawdown and reading. The two protocols for reading the neness are: NOTE 7—It is suggested that each side be counted only to a maximum of Report micrometer readings to the nearest multiple of 5 m and Hegman readings to the nearest 14 unit, A viewing box is not mandatory for illumination, but if one is desired, a proposed design for a viewing box is contained in Appendix X1.
The path shall be tapered uniformly in depth lengthwise from about d120 mils m at 10 mm from one end to zero depth at the other with intermediate calibrations in accordance with the depth at those points.
Rocking the scraper forward or back will reveal poor contact due to wear or warpage. To be sure of an accurate grind reading, specimens must be free of air bubbles.
Last previous edition approved in as D — NOTE 4—Clear nishes may have to be viewed at a lower angle or they may have to be opacied with a nely ground colorant or dye in order to see the particles better. NOTE 2—Wear or warpage of the scraper may be noted by facing the edge of the scraper down on the smooth level face of the gage, then r1210 the contact edge by means of a strong light, placed behind the gage.
Signicance and Use 4. The interlaboratory test results from the previous revision of this method are valid, but because of the discrete nature of the data, a new analysis of the values needs to be done. NOTE 3—For this test method to function properly, the pigment particles in the specimens to be tested should be free to settle to the bottom of the gage channel after the drawdown. Exert upon the d121 only sufficient pressure to clean excess material from the face of the gage.
Protect gages that lie idle for extended periods of time from rust with an oil coating or oil soaked wrap. The two edges on the 3. Therefore, before testing, high-viscosity intermediate specimens that have little ability to ow should be reduced with a compatible liquid. F1210 is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
At this stage, it is necessary to be able to judge if the pigment agglomerates have been sufficiently broken up so as not to interfere with the smoothness of the nished coating lm. A count is made of the particles deposited in the two delimited areas, and cleanliness texture reading is determined. A superscript epsilon indicates an editorial change since the last revision or reapproval.
The arrow in each drawing represents the end point reading for that distribution.
Rounded to nearest 5 m or 0. Users of this standard are expressly advised that determination of e1210 validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. D — 05 Reapproved Standard Test Method for Fineness of Dispersion of Pigment-Vehicle Systems by Hegman-Type Gage1 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.
Summary of Test Method 3. In order that readings obtained with these arbitrary scales and modications can be reported in the preferred units, the approximate relationship of these scales to gage depth is shown in the following example: This is the neness reading.
The top surface of the block shall be ground smooth and planar and shall contain one or two paths mm 5 in. A 0 to 8 specksB 9 to 15 specksand C 16 or more specks.
Be sure the gage surface is free of lint. C Federation of Societies for Paint Technology scale.