A slot is cut lengthwise on one side of the tube to act as a guide for a cylindrical weight that? Summary of Test Method 4. 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. Originally approved in NOTE 3—The copper sulfate solution will not perform properly on zinc-phosphate-treated metal unless the conversion coating cracks. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. A number in parentheses indicates the year of last reapproval.
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Standard ASTM D2794
Interlaboratory agreement is improved when ranking is used in place atm numerical values. Test astm d2794 a random fashion so that all impacts from one height are not made in succession or on one panel. We also built a six-foot tall tester for custom testing. Prepare a minimum of four astm d2794 panels for the material. Once visible cracks have been identified, the test is repeated five times at that level, as well as five times above and below that level.
Precision and Bias Your comments will receive careful consideration at a meeting of the astm d2794 technical committee, which you may attend. In its atm over many years, this test method for impact resistance has been found to be useful in predicting the performance of organic coatings for their ability to resist cracking caused by impacts.
Films generally fail by cracking see bottom photowhich is made more visible by the use of a magnifier, by the application of a copper sulfate CuSO4 solution on zstm, by the use of a astm d2794 hole detector, or by a tape-pull test to determine the amount of coating removed. NOTE 4—Because of the poor reproducibility of this method, the reporting of inch-pounds kilogram-metres in comparing coatings asmt impact resistance should be restricted to one laboratory.
The presence of cracks will be indicated by an r2794 alarm. By gradually increasing the distance the weight drops, the point at which failure usually occurs can be determined.
ASTM D – Zehntner GmbH
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. The organic coatings under test are applied to four or more suitable thin metal panels. The head rests on the test panel and the punch is held vertically by a guide ring. The indentation asmt be either an intrusion or an extrusion.
Historical Version s – view previous versions of standard Translated Version s: Users of this standard are expressly advised that determination of v2794 validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Moisten the probe sponge with tap water and astm d2794 draw the probe over the impact area. Coatings attached to substrates are subjected to damaging impacts during the manufacture astm d2794 articles and their use in service.
Universal Impact Testing – ASTM D2794
It is the responsibility of the user of this standard astm d2794 establish appropriate safety astm d2794 health practices and determine the applicability of regulatory limitations prior to use. Link astm d2794 Active This link will always route to the current Active version of the standard.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? By gradually increasing the distance the weight drops, generally 1 inch 25 mm at a time, the point at which failure usually occurs can be determined. Place the test panel in the apparatus with the coated side either up or down as speci? Touchstone Research Laboratory, Ltd.
Other gage steel panels may aztm used if agreed upon between the producer and the user. For interlaboratory comparisons, rankings of coatings for impact resistance should be reported. Raise the weight up the tube to a height where it is expected that no failure will occur. Summary of Test Method 4. If no cracks are evident, repeat the procedure at a greater height, increasing 1 in. Films generally fail by cracking, which is made more visible by the use of a magni?
After the coatings have cured, a standard weight is dropped a d27794 to strike an indenter that deforms the coating and the substrate. Interlaboratory agreement is improved when ranking is used in place of numerical values.
NOTE 1—The coatings should be applied in accordance with Practices Dor as agreed upon between the producer and the user.