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ASTM D ASTM D a. ASTM D A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. Scope 1. 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. Referenced Documents 2. Summary of Practices 3. This machine can 1 move the panel holder, with test panel, at a uniform speed through the atomized spray produced by a? A machine equipped with a programmable system can index the spray gun vertically for multiple passes and for multiple coats with selective time delay.
It is particularly important that it be used in the evaluation of metallic coatings for appearance properties, such as gloss and color.
Apparatus 5. The machine shall be designed to move the panel holder at a uniform speed past the? The panel holder or the gun mount traverse speed shall be adjustable from 7.
Typical machines are shown in Fig. Current edition approved Nov. Published January Originally published as D — 45 T.
Last previous edition D — 92a. Some examples are: a z-bar panel holder; indexing of the panel holder at right angles to the gun to provide uniform lapping; and automatic control of number of passes, time between passes, and lapping distance.
D 6. Preparation of Apparatus 6. Connect the air line hose from the regulator to the air pressure gage which in turn is connected to the air inlet of the spray gun.
Summary of Practice 9. Apparatus Suitable apparatus, is shown in Fig. Prior to withdrawal, the panel, attached to the cord, is lowered by hand into the container holding the material. NOTE 5—Rectangular containers F-style can with lid cut off are useful because the smaller exposed surfaces of the liquid coating reduces volatile loss. NOTE 3—Suitable traverse speeds for automative coatings usually range from Procedure 7.
Reduce the material to a viscosity suitable for spraying. Adjust the air pressure material? Further re? NOTE 4—The width of the spray pattern should be considerably wider than the width of the test panel to assure spray uniformity on the test panel.
Operate the spray gun so that it will begin spraying a few seconds before the test panel enters the spray pattern and continue spraying a few seconds after the test panel leaves the spray pattern. Report 8. NOTE 6—The test panels should not exceed mm 12 in. Use of a multiple hook will permit dipping several panels at one time. Procedure Measure the temperature of the material in the container at the time of application. NOTE 7—The operating conditions viscosity, percent of nonvolatile matter, and rate of withdrawal are speci?
Subsequent reproduction of the same operating conditions should give the same? Data are available3 on a variety of materials and?
The viscosity range for normal? Wind the cord once completely around the pulley of the correct size to give the desired rate of withdrawal. Bake, force-dry, or air-dry the coated panel, in accordance with its type, in a vertical position in a dust-free atmosphere in accordance with Speci?
If the coating thickness is too high, coat another panel using a faster rate of panel withdraw. Measure thickness on at least three different areas of the test panel to determine coating uniformity.
Hence, if the? Report Summary of Practice D FIG. It is more reliable for producing uniform? The base plate shall hold paper charts? The blade holder shall be designed to accommodate common types of applicator blades and to accept weights for loading the applicator blade. A mechanism shall be provided to stop the blade movement automatically at the end of the draw-down.
A suitable apparatus is shown in Fig. NOTE 9—Rigid panels shall be cleaned in an approved manner. Steel panels shall be prepared in accordance with the appropriate method in Practice D Insert the blade in the blade holder and load the holder with weights if needed.
Start the motor-drive and coat the test panel. NOTE 11—Paper charts should be taped down to prevent curling of the edges that causes the wet? NOTE 10—When?
If the coating thickness is too high, coat another panel using a smaller blade clearance. It is usually less reliable for producing uniform?
Preparation of Apparatus NOTE 13—The width of the spray pattern should be considerably wider than the width of the test panel to assure spray uniformity on the test panel. Hold the spray gun tip to mm 10 to 12 in. Begin by aiming the gun at right angles to the panel so that the spray pattern is just beyond the edge of the panel. Gradually make the spray pattern move across the panel at a traverse speed of to mm 10 to 15 in.
If the coating thickness is too high, coat another panel with fewer passes of the spray pattern or, if this is not feasible, reduce the material further with thinner. It is applicable to the coating of smooth cardboard and paper charts if some means is used to assure that these substrates are held?
Adjust the air pressure, material? Place the auxiliary bar in front of the pool of material see Fig. As the auxiliary bar is pushed by the applicator, it should press the substrate?
If the coating thickness is too high, select an applicator blade with a smaller clearance and coat another panel. Keywords 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. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phone , fax , or service astm.
ASTM D823 - 18
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