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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d1201 Any light coming through between scraper and gage face shows that the scraper has been damaged and is not satisfactory for use. Rocking the scraper forward or back will reveal poor contact due to wear or warpage.
This process allows the two test readings to be made with limited time lapses between completion of drawdown and reading. 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. Do not consider any reading for the reported neness when the time lapse exceeds 10 s.
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Within 10 s of placing the specimen on the gage, make a reading as follows: This area is equal to 6. Protect gages that lie idle for extended periods of time from rust with an oil coating or oil soaked wrap. There are 2 delimited sections on this gage, each of 6.
Average the two readings to the nearest 14 Hegman units 5 m. It may also be used to assess the inclusion of particulates by a cleanliness or texture rating. Last previous edition approved in as D — Use a solvent and a soft cloth. Be sure the gage surface is free of lint. 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.
Care of Gage 6.
Precision and Bias Determine the point in the particle distribution that approximates a similar end point pattern to that of the pictorial standards. A superscript epsilon indicates an editorial change since the last revision or reapproval. Exert upon the scraper only sufficient pressure to clean excess material from the face of the gage. Replace or recondition unsatisfactory blades.
C Federation of Societies for Paint Technology scale. Current edition approved Feb. Avoid tapping or scratching with other metal. Originally approved in Calculate the texture cleanliness of the material using d121 following formula that weights the coarse fraction 3-mil side of gage 4 times heavier than the ne fraction 1-mil side. Keeping the gage between aatm operator and the light d121, 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, These patterns are to be used for notation of frequency of particles and should not be interpreted d120 to the size of the dots.
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. A 0 to 8 specksB 9 to 15 specksand C 16 or more specks.
The path will be cut to two different depths, each for half of its length. 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: 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.
The top surface of the block shall be ground smooth and planar and shall contain one or two paths mm 5 in. When using the two-path gage, average the values in the two paths to the nearest 14 Hegman unit.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Standard ASTM D1210
Summary of Test Method 3. Individual reprints single or multiple copies of this standard may be obtained d12110 contacting ASTM at the above address or at phonefaxor service astm.
NOTE 7—It is suggested that each side be counted only to a maximum of This test method describes a way of making this judgment. 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. NOTE 1—Several arbitrary scales and modications of the gage are used by industry. 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. This average is considered one reading. The values given in parentheses are for information only.
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. Rounded to nearest 5 m or 0. A count is made of the particles deposited in the two delimited areas, and cleanliness texture reading is determined. 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.