Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact) ASTM D 2794

Coatings attached to substrates are subjected to damaging impacts during the manufacture of articles and their use in service. In its use 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.
This test method covers a procedure for rapidly deforming by impact a coating film and its substrate and for evaluating the effect of such deformation.
This test method should be restricted to testing in only one laboratory when numerical values are used because of the poor reproducibility of the method. Interlaboratory agreement is improved when ranking is used in place of numerical values.
The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

Let us see the testing procedure of Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact) as per ASTM D 2794:

The TQC Impact Test is used to determine the impact resistivity and flexibility of coatings. The dual scale instrument is equipped with a special guidance which assures that the distance between each impact is always according to the standard. For correct positioning a spirit-level is built-in. Each Impact test comes as a complete set (instrument and accessoires) to perform a test according DIN/ISO 6272, ASTM D2794 and ASTM G14 

Mandatory test in Qualicoat, QIB and GSB accredited laboratories. 

SP1880 TQC Impact Test according to ISO 6272-2 and ASTM D2794 Type: Indirect Impact Tester Content: Base plate assembly, guide tube, release collar, punch Ø12.7 mm , punch Ø15.9 mm, weight 1 kg, die Ø16.3 mm 

SP1895 TQC Impact Test according to ASTM G14 Type: Direct Impact Tester Content: Base plate assembly, guide tube, release collar, punch Ø15.9 mm, weight 1.361 kg and a V-notch vise with spring clamp to hold the pipe 

SP1890 TQC Impact Test according to ISO 6272-1 Type: Direct Impact Tester Content: Base plate assembly, guide tube, release collar, clamp device, ball Ø20 mm, die 27mm, weight 1 kg 

SP1891 TQC Impact Test according to ISO 6272-1 and ASTM D2794 (before 1993) Type: Direct Impact Tester Content: Base plate assembly, guide tube, release collar, clamp device, ball Ø20 mm, die 27mm, weight 1 kg, ball Ø15.9 mm, die 16.3mm, weight 0.9 kg


As per IS 101 Part 5 Sec 2 - it is explained to test the impact resistance of METHODS OF SAMPLING AND TEST FOR PAINTS, VARNISHES AND RELATEDPRODUCTS - by 2 diffecent methods. Method A using ball Ø15.9 mm, die 16.3mm, weight 0.9 kg and method B using ball Ø20 mm, die 27mm, weight 1 kg.

This observation does not helps to decide the product is good or bad. But at site level, we can drop the particular object from required height and observe the effect on the applied coating or flooring products.


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