ASTM D2794-93 PDF

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Touchstone offers various kinds of impact testing including Charpy and Izod impact testing and micro-scale impact tests performed inside a scanning electron microscope. An impact test which is useful for testing paint and coating adhesion is ASTM D, the drop test performed on a universal impact tester see top photo.

We have two impact testers to evaluate a variety and sizes of materials — a tabletop tester shown on the left, and a foot tall model. We also built a six-foot tall tester for custom testing. As coatings such as paint, varnish, conversion coatings, and related coating products are subjected to impact damage during their manufacturing and useful life, this test method for impact resistance has been found to be useful in predicting coating resistance to impact.

ASTM D provides a procedure for rapidly deforming by impact a coating film and its substrate and for evaluating the effect of such a deformation.

The organic coatings under test are applied to four or more suitable thin metal panels. After the coatings have cured, a standard weight is dropped a distance to strike an indenter that deforms the coating and the substrate.

The indentation can be either an intrusion or an extrusion. 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. Films generally fail by cracking see bottom photo , which is made more visible by the use of a magnifier, by the application of a copper sulfate CuSO4 solution on steel, by the use of a pin hole detector, or by a tape-pull test to determine the amount of coating removed.

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. Of course, these confirmation tests are conducted in a random order so successive tests are not conducted at the same height or on the same panel. Touchstone Research Laboratory, Ltd. Universal Impact Testing — ASTM D Touchstone offers various kinds of impact testing including Charpy and Izod impact testing and micro-scale impact tests performed inside a scanning electron microscope.

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Touchstone offers various kinds of impact testing including Charpy and Izod impact testing and micro-scale impact tests performed inside a scanning electron microscope. An impact test which is useful for testing paint and coating adhesion is ASTM D, the drop test performed on a universal impact tester see top photo. We have two impact testers to evaluate a variety and sizes of materials — a tabletop tester shown on the left, and a foot tall model. We also built a six-foot tall tester for custom testing.

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Universal Impact Testing – ASTM D2794

ASTM B 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. Scope 1. Interlaboratory agreement is improved when ranking is used in place of numerical values.

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ASTM D2794 - 93(2019)

Interlaboratory agreement is improved when ranking is used in place of numerical values. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 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. Your Alert Profile lists the documents that will be monitored. If the document is revised or amended, you will be notified by email.

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