ASTM D823 PDF
ASTM D Standard Practices for Producing Films of Uniform Thickness of Paint, Varnish, and Related Products on Test Panels. Standard Practices for. ASTM D – Designation: D – 95 (Reapproved ) Standard Practices for Producing Films o. Standard ASTM D The following devices are in accordance with ASTM D : ZAA Automatic Film Applicator Coater.
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Preparation of Apparatus 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. Wind the cord once completely around the astk of the correct size to give the desired rate of withdrawal.
Standard ASTM D823
Summary of Practice Suitable apparatus, is shown in Fig. Start the motor-drive and coat the test panel. Measure thickness on at least three different areas of the test panel to determine coating uniformity. It is particularly important that it be used in the evaluation of metallic coatings for appearance properties, such as gloss and color.
ASTM D – Zehntner GmbH
Insert the blade in the blade holder and load the holder with weights if needed. A suitable apparatus is shown in Fig. It is usually less reliable for producing uniform? Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters.
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. 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.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. 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. NOTE 6—The test panels should not exceed mm 12 in.
Use of a multiple hook will permit dipping several panels at one time. Current edition approved Nov. The panel holder or the gun mount traverse speed shall be adjustable from 7. Place the auxiliary bar in front of the pool of material see Fig. Begin by aiming the gun at right angles to the panel so that the spray pattern is just beyond the edge of the panel.
A machine equipped with a programmable system can index the spray gun vertically for multiple passes and for multiple coats with selective time delay. This standard has been approved for use by agencies of the Department of Defense. Originally published as D — 45 T.
This machine can 1 move the panel holder, with test panel, at a uniform speed through the atomized spray produced by a? It is more reliable for producing uniform? The base plate shall hold paper charts? NOTE 9—Rigid panels shall be cleaned in an approved manner. Axtm values given in parentheses are for information only. Adjust the air pressure material? Gradually make the spray pattern move across the panel at a traverse speed of to mm 10 to 15 in.
The machine shall be designed to move the panel holder at satm uniform speed past the? It is the responsibility of the user of this standard to establish appropriate safety and health f823 and determine the applicability of regulatory limitations prior to use. NOTE 11—Paper charts should be taped down to prevent curling of the edges that causes the wet?
Steel panels shall be prepared in accordance with the appropriate method in Practice D A mechanism shall be provided to stop the blade movement automatically at the end of the draw-down. Summary of Practices 3. If the coating thickness is too high, wstm another panel with fewer passes of the spray pattern or, if this ast not feasible, reduce the material further with thinner. Preparation of Apparatus 6. It is applicable to the coating of smooth cardboard and paper charts if some means is used to assure that these substrates are held?
Connect the air line asstm from the regulator to the air pressure gage which in turn is connected to the air inlet of the spray gun. If the coating thickness is too high, select an applicator blade with a smaller clearance and coat another panel.
As the auxiliary bar is pushed by the applicator, it should press the substrate? The viscosity range for normal? Summary of Practice 9. Data are available3 on a variety of materials and? A superscript epsilon e indicates an editorial change since the last revision or reapproval.
Adjust the air pressure, material? The blade holder shall be designed to accommodate common types of applicator blades and to accept weights for loading the applicator blade. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
Prior to withdrawal, the panel, attached to the cord, is lowered by hand into the container holding the material. 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.