ASTM E340, “Standard Practice for Macroetching Metals and Alloys,” has just been released. The new 2015 Edition replaces the previous 2013 Edition, which is now obsolete. You can purchase the new update in paper format, for pdf download or as part of Document Center’s Standard Online multi-user subscription service. It is an 11-page document.
The new 2015 Edition changes the document from a Standard Test Method to a Standard Practice. What’s the difference between an ASTM Test Method standard and an ASTM Standard Practice? A test method standard leads to a test result, while a standard practice does not. This change is reflective of the fact that the document is primarily a list of various metals and alloys along with the proper “macroetchants” and procedures to use for this purpose.
You’ll be using this standard to determine what solutions you’ll use for macroetching various metals. Tables in the publication also include the correct procedure for each along with comments. However, there is no definition of test results in the publication. You’ll have your own parameters in mind when you initiate any testing.
Why use ASTM E340 and macroetching? The process is used extensively in quality control to reveal the macrostructure of various metals and alloys. This may reveal such things as cracks, internal faults, and surface defects. So you’ll find it used in machine shops, forges and foundries.
What are the other changes in this new 2015 Edition of the ASTM E340? The committee has not provided any guidance to the changes in this new edition. This means that you’ll need to purchase the redline copy for assistance in identifying the changes in this new edition for your GAP analysis. A redline copy from ASTM provides you with both a clean copy of the new edition and a copy of the previous edition with the changes clearly marked throughout the document. The additional cost is insignificant compared with the time savings you’ll get when you use this tool.
Where should you purchase your copy of the ASTM E340? Since it’s a copyright publication, you’ll need to buy your update from an authorized distributor of the ASTM standards collections. Document Center Inc. provides you with easy ordering at our webstore, www.document-center.com. Here is a link directly to the order page for ASTM E340. Want more help or information on our multi-user subscription service, Standards Online? Just contact our staff via phone (650-591-7600), fax (650-591-7617) or email (info@document-center.com). We’ve been selling standards since 1982. Make us your Standards Experts!
