In the last article, the need for involvement in other committees that affected coil coating was discussed as a result of the downgrading of the Hunter L,A,B method in Committee E12. Fortunately the “do not use” recommendation was rescinded as a result of paying attention outside coil coating’s immediate sphere of influence. On the flip side, in recent months several topics have arisen in ASTM committees other than D01.53, where specifications have been revised or discussed that required the expertise of the coil coating world. These discourses often led to significant changes to long standing specifications that were requested by both our international and domestic members. With ASTM truly an international organization, many perspectives and interpretive questions arise weekly that allow ASTM specifications to improve and become even more relevant for the future. It is particularly important for experts in the world of coil coating to lend their knowledge and experience to committees that tangentially touch D01.53. The specification worlds of steel, aluminum, post-painting, mechanical testing, accelerated corrosion testing and disciplined laboratory methodology all benefit from the unique perspective provided by coil coating. And these are not just intellectual exercises. Winning business can sometimes depend upon being able to perform and pass requirements defined within ASTM specifications. In the past, some of these ambiguities were explained contextually by long standing members within the various disciplines. Unfortunately, many of these experts are now retired or about to retire. The world of coil coating is losing hundreds of years of collective knowledge that may not be written clearly enough for adjacent industries and for those that are new to the coil coating industry.
___ For example, a coil coater was unable to win business due to the mandatory testing defined in Annex 1 of A755/A755M because it was specified by the potential customer. A755/A755M is the “Standard Specification for Steel Sheet, Metallic Coated by the Hot-Dip Process and Prepainted by the Coil-Coating Process for Exterior Exposed Building Products” housed in Committee A05. As you can see from the title, the painting portion of this specification is very critical to providing prepainted building products that can be warranted. Unfortunately, some of the mandatory testing was not possible on a coil coated product. One of the mandatory tests was to measure the mechanical properties of the paint film itself as a quality control test – a misinterpretation of D2370, a test specification that actually governed thick polymer films. Once the comparatively thin paint film adhered to the substrate it was impossible to perform the “required” testing. Unfortunately, the coater’s customer was unconvinced because it was listed in the mandatory testing annex. Another part of that annex required measurement of the durometer hardness of the paint film according to D2240. Again, this was an inappropriate test for coil coated sheet. Both of these misappropriated requirements were causing the coater to lose significant business potential. As a result of this inquiry, this annex was revised to incorporate appropriate testing for coil coating along with updating the specification with modern film thickness measurement techniques. In this case, the steel committee benefited from the expertise of the coil coating industry. The specification was rewritten and appropriate testing will facilitate a conversion from alternate materials to coil coated building product. The resulting ballot that closed last month provided the votes needed to officially revise the specification.
___ Another example of a seemingly unrelated specification that benefited from coil coating knowledge of passivation chemistry and corrosion resistant zinc coated products is the current endeavor to clarify and revise A1003 “Standard Specification for Steel Sheet, Carbon, Metallic and Conversion Coated for Cold-Formed Framing Members”. This specification, also housed in Committee A05, was originally written to provide a standard for metallic coated framing products. Written by segments of the steel industry, many of the terms and information related to the conversion coatings themselves were confusing. Through the collaboration of a combination of steel, metallic coating, coil coating and framing experts, the specification is undergoing a significant revision that will allow the industry to have a clear definition of the requirements of this product that incorporates both old and new technology. This cooperative effort will allow a ballot item to come forward in the third quarter after several years of confusion and controversy.
ASTM D01.53 Coil Coating Subcommittee Review
___ With all the tangential activity, D01.53 has not been quiet. There are now 45 members of this subcommittee, four of which are new coil coater company members. Two test methods have successfully passed main committee balloting and are located in the ASTM/NCCA Collaborative Portal: D7639 “Test Method for Determination of Zirconium Treatment Weight or Thickness on Metal Substrates by X-Ray Fluorescence” and D6665 “Practice for Evaluation of Aging Resistance of Pre-stressed Prepainted Metal in a Boiling Water Test”. Nine other standards are in various stages of review and or revision and will be balloted during the fourth quarter of this year. Once these standards are approved, the latest versions will be available on the ASTM/NCCA Collaborative Portal.
Through the D01.53 Accelerated Weathering Task Group, new work item has been initiated in order to provide a document listing a collection of outdoor accelerated test sites as a service for ASTM members. NCCA members will also benefit from this document. This work was begun in response to a myriad of questions around the industry as to the identification, location, certification and reputation of exposure testing facilities. The objective is to have a relatively complete listing for members to access on the D01 home page and through the ASTM/NCCA Collaborative Portal.
___ Finally, as always, new ASTM D01.53 members are always welcome. The $75 yearly membership is well worth the cost. Not only can you become involved directly with coil coating by joining D01.53, you can lend your expertise to tangential disciplines and keep coil coating knowledge alive for the next generation.