{"id":3358,"date":"2025-12-25T16:04:35","date_gmt":"2025-12-25T08:04:35","guid":{"rendered":"https:\/\/www.psaball.com\/?page_id=3358"},"modified":"2026-05-08T07:23:46","modified_gmt":"2026-05-07T23:23:46","slug":"avoiding-misinterpretation-and-false-alarms-in-surface-chloride-measurement","status":"publish","type":"page","link":"https:\/\/www.PSABaLL.com\/?page_id=3358","title":{"rendered":"Technical Clarification: Preventing Misinterpretation of Surface Chloride and Conductivity Results"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\">Technical Clarification on Conductivity Testing and Surface Salt Assessment for Premier Sharpshot Abrasive\u00ae (PSA)<\/h3>\n\n\n\n<h2 class=\"wp-block-heading\">1. Introduction<\/h2>\n\n\n\n<p>Surface-soluble salt contamination is a critical factor in abrasive blasting and protective coating applications. Excessive levels of chlorides, sulphates, and nitrates may contribute to coating failure mechanisms such as:<\/p>\n\n\n\n<ul>\n<li>Flash rusting<\/li>\n\n\n\n<li>Osmotic blistering<\/li>\n\n\n\n<li>Loss of adhesion<\/li>\n\n\n\n<li>Premature coating breakdown<\/li>\n<\/ul>\n\n\n\n<p>However, incorrect interpretation of conductivity-based measurements\u2014particularly when applied to engineered mineral abrasives\u2014can result in false contamination alarms, unnecessary abrasive rejection, and project delays.<\/p>\n\n\n\n<p>It is therefore essential to distinguish between <strong>conductivity screening tests<\/strong> and <strong>actual surface salt contamination testing<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. PSA Mineral Characteristics and Formation<\/h2>\n\n\n\n<p>Premier Sharpshot Abrasive\u00ae (PSA) is an engineered abrasive classified under ISO 11126-6 as a:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Predominantly amorphous (glassy), non-crystalline Calcium\u2013Iron\u2013Silicate formed from Electric Arc Furnace (EAF) slag.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>PSA is produced through high-temperature EAF processing, typically exceeding:<\/p>\n\n\n\n<p>      <strong><em>  <\/em>&gt;1400\u00b0C<\/strong><\/p>\n\n\n\n<p>During this process:<\/p>\n\n\n\n<ul>\n<li>Raw materials are fully melted and refined<\/li>\n\n\n\n<li>Volatile and unstable compounds are eliminated<\/li>\n\n\n\n<li>The material is rapidly quenched into a stable glassy (amorphous) structure<\/li>\n<\/ul>\n\n\n\n<p>As a result, PSA does not retain significant levels of water-soluble corrosive salts such as:<\/p>\n\n\n\n<ul>\n<li>Chlorides<\/li>\n\n\n\n<li>Sulphates<\/li>\n\n\n\n<li>Nitrates<\/li>\n<\/ul>\n\n\n\n<p>Independent laboratory testing has consistently confirmed these contaminants as <strong>Below Detection Limit (BDL)<\/strong> or <strong>Not Detected (N.D.)<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. Conductivity Behavior of PSA (Material-Specific Property)<\/h2>\n\n\n\n<p>Due to its inherent Calcium\u2013Iron\u2013Silicate structure, PSA may exhibit measurable conductivity during extraction testing when in contact with water (H\u2082O).<\/p>\n\n\n\n<p>This conductivity is a result of:<\/p>\n\n\n\n<ul>\n<li>Natural mineral ionic activity<\/li>\n\n\n\n<li>Surface-associated mineral species<\/li>\n\n\n\n<li>Intrinsic electrical behavior of the Ca\u2013Fe\u2013Si glass matrix<\/li>\n<\/ul>\n\n\n\n<p>A simplified representation of the surface interaction is:<\/p>\n\n\n\n<p><strong><em>Ca\u2009\u2063\u2009\u2063\u2212\u2060Fe\u2009\u2063\u2009\u2063\u2212\u2060Si&nbsp;mineral&nbsp;matrix+H2O\u2192trace&nbsp;ionic&nbsp;activity+surface&nbsp;hydroxylation<\/em><\/strong><\/p>\n\n\n\n<p>This interaction is:<\/p>\n\n\n\n<ul>\n<li>Surface-limited<\/li>\n\n\n\n<li>Non-aggressive<\/li>\n\n\n\n<li>Chemically stable<\/li>\n<\/ul>\n\n\n\n<p>Importantly:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>This conductivity is NOT equivalent to harmful water-soluble salt contamination.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>It does not indicate the presence of corrosive species that contribute to coating failure mechanisms.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. Independent Laboratory Verification<\/h2>\n\n\n\n<p>Premier Sharpshot Abrasive\u00ae (PSA) has been independently tested by three (3) separate laboratories to evaluate harmful water-soluble salts relevant to corrosion performance.<\/p>\n\n\n\n<p>Results consistently confirmed:<\/p>\n\n\n\n<ul>\n<li>Chlorides: Below Detection Limit (BDL) \/ Not Detected<\/li>\n\n\n\n<li>Water-soluble chlorides: BDL \/ N.D.<\/li>\n\n\n\n<li>Sulphates: BDL \/ N.D.<\/li>\n\n\n\n<li>Nitrates: BDL \/ N.D.<\/li>\n<\/ul>\n\n\n\n<p>These findings confirm that PSA does not introduce significant corrosive soluble salt contamination during abrasive blasting operations.<\/p>\n\n\n\n<p>Accordingly, conductivity values observed in PSA are attributable to its intrinsic mineral matrix and not to contamination.<\/p>\n\n\n\n<p><em>For customers, inspectors, consultants, or project owners requiring supporting laboratory reports or technical verification documents, please contact us for further information and report copies.<\/em><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">5. Conductivity Test vs Surface Salt Contamination Test<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">5.1 Conductivity Test (Before Blasting)<\/h3>\n\n\n\n<p>Purpose:<\/p>\n\n\n\n<ul>\n<li>Screening of total ionic activity in abrasive extract<\/li>\n<\/ul>\n\n\n\n<p>Key limitations:<\/p>\n\n\n\n<ul>\n<li>Does not identify specific ions<\/li>\n\n\n\n<li>Cannot distinguish corrosive vs non-corrosive species<\/li>\n\n\n\n<li>Not a direct corrosion risk indicator<\/li>\n<\/ul>\n\n\n\n<p>Typical reference:<\/p>\n\n\n\n<ul>\n<li>ISO 11127-6<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">5.2 Surface Salt Contamination Test (After Blasting)<\/h3>\n\n\n\n<p>Purpose:<\/p>\n\n\n\n<ul>\n<li>Measurement of actual soluble salts on steel surface after blasting<\/li>\n<\/ul>\n\n\n\n<p>Measured as:<\/p>\n\n\n\n<ul>\n<li>mg\/m\u00b2 of soluble salts<\/li>\n<\/ul>\n\n\n\n<p>Directly relevant to:<\/p>\n\n\n\n<ul>\n<li>Coating performance<\/li>\n\n\n\n<li>Corrosion risk<\/li>\n\n\n\n<li>Surface acceptance criteria<\/li>\n<\/ul>\n\n\n\n<p>Typical references:<\/p>\n\n\n\n<ul>\n<li>ISO 8502-6<\/li>\n\n\n\n<li>ISO 8502-9<\/li>\n\n\n\n<li>SSPC \/ AMPP practices<\/li>\n<\/ul>\n\n\n\n<p>\u2714 This is the <strong>true acceptance test for coating readiness<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">6. Industry Standards Interpretation (ISO \/ SSPC \/ AMPP)<\/h2>\n\n\n\n<p>Industry standards consistently emphasize that:<\/p>\n\n\n\n<ul>\n<li>The critical parameter is <strong>post-blast surface contamination<\/strong><\/li>\n\n\n\n<li>Conductivity is a <strong>screening parameter only<\/strong><\/li>\n\n\n\n<li>Acceptance is based on <strong>project-specific surface salt limits<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Importantly:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>No ISO or AMPP standard defines conductivity of abrasive as a sole rejection criterion.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>Instead, standards focus on:<\/p>\n\n\n\n<ul>\n<li>Chloride concentration on steel surface<\/li>\n\n\n\n<li>Total soluble salt levels after blasting<\/li>\n\n\n\n<li>Coating system requirements<\/li>\n\n\n\n<li>Service environment severity<\/li>\n<\/ul>\n\n\n\n<p>The relevant evaluation must therefore be performed using:<\/p>\n\n\n\n<ul>\n<li>ISO 8502-6 (Bresle extraction)<\/li>\n\n\n\n<li>ISO 8502-9 (conductivity conversion to mg\/m\u00b2)<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">7. Technical Position of PSA<\/h2>\n\n\n\n<p>Conductivity readings associated with Premier Sharpshot Abrasive\u00ae (PSA) shall be considered <strong>screening information only<\/strong> and must not be used as the sole basis for rejection or contamination judgment.<\/p>\n\n\n\n<p>Assessment of PSA suitability for coating applications shall be based on:<\/p>\n\n\n\n<ul>\n<li>Post-blast surface salt contamination testing<\/li>\n\n\n\n<li>Chloride-specific evaluation<\/li>\n\n\n\n<li>ISO 8502 methodology<\/li>\n\n\n\n<li>SSPC \/ AMPP coating inspection standards<\/li>\n\n\n\n<li>Project-specific coating requirements<\/li>\n<\/ul>\n\n\n\n<p>When evaluated using proper surface salt testing methods, PSA supports effective surface preparation and long-term coating performance.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">8. Technical Summary<\/h2>\n\n\n\n<p>Premier Sharpshot Abrasive\u00ae (PSA) is an engineered Calcium\u2013Iron\u2013Silicate abrasive produced under high-temperature EAF processing (&gt;1400\u00b0C), resulting in a stable amorphous mineral structure.<\/p>\n\n\n\n<p>Key conclusions:<\/p>\n\n\n\n<ul>\n<li>Conductivity is an intrinsic material property, not contamination<\/li>\n\n\n\n<li>PSA does not contain harmful soluble salts (Tested BDL)<\/li>\n\n\n\n<li>Conductivity does not correlate directly with corrosion risk<\/li>\n\n\n\n<li>Surface salt testing after blasting is the correct acceptance method<\/li>\n<\/ul>\n\n\n\n<p>Therefore:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong><em>Coating readiness must be determined by post-blast surface contamination testing in accordance with ISO 8502 and SSPC \/ AMPP practices, not by abrasive conductivity alone.<\/em><\/strong><\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>Technical Clarification on Conductivity Testing and Surface Salt Assessment for Premier Sharpshot Abrasive\u00ae (PSA) 1. Introduction Surface-soluble salt contamination is&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"_links":{"self":[{"href":"https:\/\/www.PSABaLL.com\/index.php?rest_route=\/wp\/v2\/pages\/3358"}],"collection":[{"href":"https:\/\/www.PSABaLL.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.PSABaLL.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.PSABaLL.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.PSABaLL.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3358"}],"version-history":[{"count":26,"href":"https:\/\/www.PSABaLL.com\/index.php?rest_route=\/wp\/v2\/pages\/3358\/revisions"}],"predecessor-version":[{"id":3779,"href":"https:\/\/www.PSABaLL.com\/index.php?rest_route=\/wp\/v2\/pages\/3358\/revisions\/3779"}],"wp:attachment":[{"href":"https:\/\/www.PSABaLL.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3358"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}