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Description of ASTM-D4940 2010ASTM D4940 - 10Standard Test Method for Conductimetric Analysis of Water Soluble Ionic Contamination of Blasting AbrasivesActive Standard ASTM D4940 | Developed by Subcommittee: D01.46 Book of Standards Volume: 06.02 ASTM D4940Significance and Use By-product abrasives manufactured from slags that are air cooled or quenched with pure water, normally contain low concentrations of ionic materials, as do mined mineral abrasives. However, slags quenched with seawater or other contaminated water, contain high amounts of ionic material as does seashore sand. This contamination of the abrasive can transfer to the steel surfaces being blasted, where it may accelerate corrosion. This test is useful in establishing the cleanliness of the abrasive at the jobsite. This test method provides a value that indicates the concentration of total water soluble ions based on their electrolytic mobility. Thus, it provides an indication of ionic corrosion potential. Note 1A typical value of conductivity for a high level of contamination is 500 ? mho/cm. A typical value for a low level of contamination is 50 ? mho/cm. 1. Scope 1.1 This test method describes a procedure for rapid evaluation of abrasives for the presence of ionic contamination by determining the total concentration of water soluble ionic contaminants by means of a conductivity test. 1.2 This test method does not identify the ionic species present nor provide quantitative results on each species. 1.3 This test method is based on a volume comparison among abrasives of similar sizes. A volume comparison is more closely related to surface area of the abrasives than is a weight comparison. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. 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.
ASTM Standards D1193 Specification for Reagent Water E832 Specification for Laboratory Filter Papers Other Standard ISO11127-6 Preparation of Steel Substrates before Application of Paints and Related Products - Test Methods for Non-Metallic Blast Cleaning Abrasives - Part 6: Determination of Water-Soluble Contaminants by Conductivity Measurement Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.SSPC: The Society for Protective Coatings SSPC-AB1 Specification for Mineral and Slag Abrasives Available from Society for Protective Coatings (SSPC), 40 24th St., 6th Floor, Pittsburgh, PA 15222-4656, http://www.sspc.org..Keywords abrasive; analysis; blasting; chloride; conductimetric; conductivity; contamination; interlaboratory testing; ionogenic; precision; salts. ; steel surfaces; Abrasive blasting; Calibration; Conductance and conductivity (electrical); Conductimetric analysis; Contamination--paints/coatings applications; Field testing--paints/related coatings/materials; Interlaboratory testing--construction materials; Ionogenic contamination; Salts; Slag; Slurries; Steel surfaces; Water-soluble-matter content; ICS Code ICS Number Code 25.220.10 (Surface preparation) DOI: 10.1520/D4940-10 ASTM International is a member of CrossRef. ASTM D4940The following editions for this book are also available...This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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