ASTM D2794 and ASTM G16

Introducing ASTM D2794 and ASTM G16– Industrial Physics 

ASTM D2794 and ASTM G16 are international ASTM testing methods to evaluate the impact resistance and corrosion resistance of organic coatings.  

The ASTM D2794 paint impact test is often carried in conjunction with tests like ASTM G16, which helps you to analyze corrosion data.   

The American Society for Testing Materials (ASTM) is one of the most influential standard bodies in existence. Established in 1898, ASTM international exists to develop standardized test methods, specifications, practices, guides, classification, and terminology across a range of subject areas. 

When you coat substrates with paints or varnishes, they will naturally endure damage from the environment or their use in service over the years. The ASTM D2794 impact resistance test is useful for predicting the performance of organic coatings for their ability to resist cracking caused by impacts. 

The ASTM D2794 impact testing process

The ASTM D2794 impact testing method covers a procedure for rapidly deforming and measuring how a coating film and its substrate respond to the force deployed.  

This ASTM test involves applying organic coatings to metal panels and dropping a standard weight from a specified distance. The aim of this is to deform and induce an indent to the coating and substrate.  

By increasing the distance that the weight is dropped from, and repeating the test, you can determine the point where failure occurs. You’ll typically find that paint films crack when they break, and you can enhance your ability to visualize and analyze the damage by using a magnifier. This can include copper sulfate or a pin-hole detector. You can also use stereoscopic evaluations to gain a clearer and more complete understanding.  

When you’re impact testing through ASTM D2794 and using numerical values then you should do all your tests in one laboratory. This is because of the poor reproducibility of the method. Interlaboratory agreement is improved when ranking is used in place of numerical values. 

The ASTM G16 corrosion testing standard 

As stated earlier the ASTM D2794 test is sometimes accompanied by additional tests, such as corrosion testing. The ASTM G16 standard describes accepted methods of statistical analyses, which are useful to interpret corrosion test results. It doesn’t cover detailed calculations and methods but provides a range of corrosion testing approaches.  

Corrosion test results often show more scatter than many other types of tests because of a variety of factors including the fact that minor impurities often play a decisive role in controlling corrosion rates. Statistical analysis helps you to interpret results, especially in determining when test results differ from one to another significantly. This can be a difficult task when a variety of materials are under test, but statistical methods provide a rational approach to this problem. 

Industrial Physics ASTM D2794 testing and G16 testing equipment

So, how can Industrial Physics improve your ASTM D2794 testing?  

TQC Sheen Ball Ø 15.9 for impact test (ISO)
Ball Ø 15.9 for impact test (ISO) 

Be sure to check out some of the other impact testing solutions we offer across our whole portfolio. 

Need impact testing solutions? Get in touch

We’ve learnt a thing or two about impact testing over the decades. Now Industrial Physics is recognized as a brand that likes to bring new, innovative impact testers to market. 

We like to share our knowledge and we’re here to help you to answer your questions. Across the knowledgebase section of our website we publish lots of blogs on related subjects.  First up, why not try this blog that explores the different types of impact testing equipment? Then you could try this one – instrumented falling weight impact testing: greater understanding in a fraction of the time! 

If you have any questions about either the ASTM D2794 impact testing or the ASTM G16 corrosion testing methods, then just get in touch!
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