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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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. A number in parentheses indicates the year of last reapproval. A superscript epsilon indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense. It may also be used to assess the inclusion of particulates by a cleanliness or texture rating.
The values given in parentheses are for information only. It 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. Summary of Test Method 3. At some point in this path, particles or agglomerates, or both, will become visible. Current edition approved Feb. Originally approved in Last previous edition approved in as D — There are 2 delimited sections on this gage, each of 6.
A count is made of the particles deposited in the two delimited areas, and cleanliness texture reading is determined. Signicance and Use 4. 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. This test method describes a way of making this judgment. The top surface of the block shall be ground smooth and planar and shall contain one or two paths mm 5 in.
The path shall be tapered uniformly in depth lengthwise from about 4 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. Preferred calibrations are Hegman units and micrometers Note 1.
Three path widths are covered by this test method: No further reproductions authorized. NOTE 1—Several arbitrary scales and modications of the gage are used by industry.
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: Rounded to nearest 5 m or 0. C Federation of Societies for Paint Technology scale. The path will be cut to two different depths, each for half of its length. The two depths will be 3 mils, and 1 mil, or as agreed upon between the buyer and the seller. The two edges on the 3. 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.
Care of Gage 6. Use a solvent and a soft cloth. Keep the gage covered or encased at 2 5. D — 05 1-in. Replace or recondition unsatisfactory blades. 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 inspecting the contact edge by means of a strong light, placed behind the gage.
Rocking the scraper forward or back will reveal poor contact due to wear or warpage. Any light coming through between scraper and gage face shows that the scraper has been damaged and is not satisfactory for use.
Protect gages that lie idle for extended periods of time from rust with an oil coating or oil soaked wrap. Avoid tapping or scratching with other metal. The arrow in each drawing represents the end point reading for that distribution.
These patterns are to be used for notation of frequency of particles and should not be interpreted according to the size of the dots. Three ratings are indicated: A 0 to 8 specksB 9 to 15 specksand C 16 or more specks. Be sure the gage surface is free of lint.
To be sure of an accurate grind reading, specimens must be free of air bubbles. 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.
Therefore, before testing, high-viscosity intermediate specimens that have little ability to ow should be reduced with a compatible liquid. Reduction should be in approximately the same proportion as the intermediate will be reduced in practice. When using the double-path gage, place material in both paths. Exert upon the scraper only sufficient pressure to clean excess material from the face of the gage. Within 10 s of placing the specimen on the gage, make a reading as follows: 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 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. 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 When using the two-path gage, average the values in the two paths to the nearest 14 Hegman unit.
This average is considered one reading. The two protocols for reading the neness are: This is the neness reading. This process allows the two test readings to be made with limited time lapses between completion of drawdown and reading.
Do not consider any reading for the reported neness when the time lapse exceeds 10 s. Average the two readings to the nearest 14 Hegman units 5 m. Determine the point in the particle distribution that approximates a similar end point pattern to that of the pictorial standards.
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. 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 area is equal to 6. 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.
NOTE 7—It is suggested that each side be counted only to a maximum of Keeping the gage between the operator and the light source, make the angle between the face of the gage Report micrometer readings to the nearest multiple of 5 m and Hegman readings to the nearest 14 unit, Precision and Bias 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.
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ASTM D Fineness of Dispersion of Pigment-Vehicle Systems by Hegman-Type Scale
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