{"id":26259,"date":"2022-04-26T11:54:24","date_gmt":"2022-04-26T09:54:24","guid":{"rendered":"https:\/\/montipower.com\/servicio-y-soporte\/academy\/dr-prepper-edition-8\/"},"modified":"2023-08-17T10:14:10","modified_gmt":"2023-08-17T08:14:10","slug":"dr-prepper-edition-8","status":"publish","type":"page","link":"https:\/\/montipower.com\/es\/servicio-y-soporte\/academy\/dr-prepper-edition-8\/","title":{"rendered":"Dr. Prepper Edition 8"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_section full_width=&#8221;stretch_row&#8221; content_placement=&#8221;bottom&#8221; css=&#8221;.vc_custom_1569320141112{padding-top: 30px !important;padding-bottom: 0px !important;background-color: #ff1212 !important;background-position: center !important;background-repeat: no-repeat !important;background-size: cover !important;}&#8221; el_class=&#8221;topbig&#8221;][vc_row css=&#8221;.vc_custom_1569318223776{padding-right: 100px !important;padding-left: 100px !important;}&#8221;][vc_column width=&#8221;1\/2&#8243;][vc_column_text]<\/p>\n<h1>Dr. Prepper<br \/>\nedition 8<\/h1>\n<p>[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/2&#8243;][\/vc_column][\/vc_row][vc_row full_width=&#8221;stretch_row_content_no_spaces&#8221; content_placement=&#8221;bottom&#8221; css=&#8221;.vc_custom_1572526136907{padding-top: 0px !important;padding-bottom: 100px !important;background-position: 0 0 !important;background-repeat: no-repeat !important;}&#8221; el_class=&#8221;hometopfotorij&#8221;][vc_column][\/vc_column][\/vc_row][\/vc_section][vc_section full_width=&#8221;stretch_row&#8221; el_class=&#8221;textcomp&#8221; css=&#8221;.vc_custom_1589963507382{margin-top: -250px !important;margin-bottom: 0px !important;}&#8221;][vc_row][vc_column][vc_single_image image=&#8221;5721&#8243; img_size=&#8221;700&#215;700&#8243; alignment=&#8221;center&#8221;][\/vc_column][\/vc_row][vc_row full_width=&#8221;stretch_row&#8221; css=&#8221;.vc_custom_1572525974229{background-color: #f1f1f1 !important;}&#8221;][vc_column][vc_column_text el_class=&#8221;montbreadcrumbs&#8221; css=&#8221;.vc_custom_1569318576735{padding-right: 100px !important;padding-left: 100px !important;}&#8221;]<nav aria-label=\"breadcrumbs\" class=\"rank-math-breadcrumb\"><p><span class=\"last\">Home<\/span><\/p><\/nav>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;2\/3&#8243;][vc_column_text]<\/p>\n<h3 class=\"p1\">Coating Longevity through Proper Surface Preparation<\/h3>\n<p class=\"p1\">In this eighth edition of Dr. Prepper, we\u2019ll continue to examine of <em>why<\/em> proper surface preparation is paramount and how the Bristle Blaster delivers uniquely high levels of surface preparation.<\/p>\n<p class=\"p1\">Poor surface preparation and coating application can lead to premature coating degradation, particularly through a loss of adhesion and a greater risk of corrosion.<\/p>\n<p class=\"p1\">There have been appropriate, well-defined standards available for many years, but these are not always applied, or at least not always correctly applied.<\/p>\n<p class=\"p1\">So, what should you take into account in your efforts for proper and successful surface preparation?<\/p>\n<p>[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/3&#8243;][vc_single_image image=&#8221;26010&#8243;][vc_column_text]<\/p>\n<p style=\"text-align: right;\"><em>The regular RED PAPER from MontiPower<sup>\u00ae<\/sup>. Full of nice to know &#8211; and need to know &#8211; facts about the most optimal surface preparation since 1987.<\/em><\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][\/vc_section][vc_section full_width=&#8221;stretch_row&#8221; el_class=&#8221;textcomp&#8221; css=&#8221;.vc_custom_1589962725517{margin-top: -10px !important;margin-bottom: 0px !important;}&#8221;][vc_row][vc_column][vc_single_image image=&#8221;26016&#8243; img_size=&#8221;full&#8221; alignment=&#8221;center&#8221;][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<p class=\"p1\"><span class=\"s1\">Dr Prepper undertook an investigation to examine the surface preparation of the Bristle Blaster in comparison with grit blasting and conventional rotating wire brushes. We selected 3 different starting surfaces for our investigation &#8211; \u201cmill scale\u201d, \u201crust\u201d and \u201ccold rolled\u201d &#8211; uncoated steel. Prepared surfaces were characterized by the degree of preparation and a range of roughness parameters. Coated coupons according to DIN EN ISO 12944-6:1998 were exposed to various levels of corrosion in accordance with the C3, medium term of protection, corrosivity category.<\/span><\/p>\n<p><a name=\"objective\"><\/a>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_single_image image=&#8221;26028&#8243; img_size=&#8221;full&#8221;][vc_column_text]<\/p>\n<p style=\"text-align: center;\"><em><span class=\"s1\" style=\"color: #ff0000;\">Bristle Blaster Electric Type <\/span><\/em><\/p>\n<p>[\/vc_column_text][vc_empty_space height=&#8221;40px&#8221;][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/3&#8243;][vc_single_image image=&#8221;26022&#8243; img_size=&#8221;full&#8221; alignment=&#8221;center&#8221;][\/vc_column][vc_column width=&#8221;2\/3&#8243;][vc_column_text]<\/p>\n<p class=\"p1\">The first tool selected for the investigation was the Monti Bristle Blaster electric type 3200.<span class=\"Apple-converted-space\">\u00a0 <\/span>With this tool we examined it with different belt configurations to examine the roughing potential.<span class=\"Apple-converted-space\">\u00a0 <\/span>In the first case the 23mm carbon steel belt was used alone while in the second case we used 2 x 11mm belts side by side. The idle speed of the tool used was 3200 RPM.<span class=\"Apple-converted-space\">\u00a0 <\/span>For surface preparation, either 1 brush with a width of 23mm was used alone or 2 brushes with a width 11mm were used side by side.<\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<p class=\"p1\"><span class=\"s1\">For the grit blasting, a mixture of angular cast iron pellets with a grain size of 0.1 to 1.0mm were used with a jet pressure of approximately 6 bar.<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">For the testing, we employed coupons of 150 x 100 mm with a material thickness of 3mm.<span class=\"Apple-converted-space\"><br \/>\n<\/span>For starting points A and C we used hot-rolled stell S 235 JR and for the cold-rolled steel DC 01.<\/span><\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_empty_space][\/vc_column][\/vc_row][vc_row][vc_column][vc_single_image image=&#8221;26034&#8243; img_size=&#8221;large&#8221; alignment=&#8221;center&#8221;][vc_column_text]<\/p>\n<p class=\"p1\"><span class=\"s1\" style=\"color: #ff0000;\">Figure 1: <\/span><i>Conventional Rotating <\/i><i>Wire Brush for Comparison<\/i><\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_empty_space][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/2&#8243;][vc_column_text]<\/p>\n<p class=\"p1\"><span class=\"s1\">The third method employed was an electrically driven hand drill using a conventional rotating wire brush with a diameter of 75mm and width of 8-10mm.<span class=\"Apple-converted-space\">\u00a0 <\/span>The rotational speed was 600 RMP <\/span><span class=\"s1\" style=\"color: #ff0000;\">(see Figure 1)<\/span><span class=\"s1\">.<\/span><\/p>\n<p>[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_single_image image=&#8221;26040&#8243; img_size=&#8221;full&#8221;][\/vc_column][\/vc_row][\/vc_section][vc_section full_width=&#8221;stretch_row&#8221; el_class=&#8221;textcomp&#8221; css=&#8221;.vc_custom_1589962315313{margin-top: -10px !important;margin-bottom: 0px !important;}&#8221;][vc_row][vc_column][vc_empty_space][\/vc_column][\/vc_row][vc_row][vc_column][vc_single_image image=&#8221;26057&#8243; img_size=&#8221;500&#215;127&#8243;][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/3&#8243;][vc_column_text]<\/p>\n<p class=\"p1\"><span class=\"s1\">The bristle blasting method was assessed for surface preparation in acordance with ISO8501-1. <\/span><span class=\"s1\">In detail, the following results were obtained for different initial states<\/span><span class=\"s1\">\u00a0<\/span><span class=\"s1\" style=\"color: #ff0000;\">(see Table 1 and Figures 3 to 14 in the Appendix PDF download below)<\/span><span class=\"s1\">.<\/span><\/p>\n<p>[\/vc_column_text][\/vc_column][vc_column width=&#8221;2\/3&#8243;][vc_single_image image=&#8221;26555&#8243; img_size=&#8221;full&#8221;][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/2&#8243;][vc_column_text]<\/p>\n<p class=\"p1\"><span class=\"s1\">In contrast, and depending on the initial state of the coupon, conventional rotating wire brushing left either cinder or rust residues behind on the coupon surface. <\/span><\/p>\n<p>[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_single_image image=&#8221;26069&#8243; img_size=&#8221;full&#8221;][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/6&#8243;][vc_single_image image=&#8221;26004&#8243; img_size=&#8221;full&#8221;][\/vc_column][vc_column width=&#8221;5\/6&#8243;][vc_empty_space height=&#8221;25px&#8221;][vc_column_text]<\/p>\n<p class=\"p1\"><span class=\"s1\" style=\"color: #ff0000;\"><b>The Bristle Blaster left no<br \/>\nresidue on the surface after treatment.<\/b><\/span><\/p>\n<p><a name=\"preparation\"><\/a>[\/vc_column_text][\/vc_column][\/vc_row][\/vc_section][vc_section full_width=&#8221;stretch_row&#8221; el_class=&#8221;textcomp&#8221; css=&#8221;.vc_custom_1589962315313{margin-top: -10px !important;margin-bottom: 0px !important;}&#8221;][vc_row][vc_column][vc_empty_space][\/vc_column][\/vc_row][vc_row][vc_column][vc_single_image image=&#8221;26081&#8243; img_size=&#8221;full&#8221;][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/2&#8243;][vc_column_text]<\/p>\n<p class=\"p1\"><span class=\"s1\">To characterize the roughness profile, different roughness indicators were used in accordance with DIN EN ISO 4287, which describe roughening in both the vertical and the horizontal direction:<\/span><\/p>\n<p><a name=\"roughness\"><\/a>[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_single_image image=&#8221;26133&#8243; img_size=&#8221;full&#8221;][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h3 class=\"p1\"><span class=\"s1\" style=\"color: #ff0000;\"><strong><i>\u201cBristle Blasting roughness compares <\/i><i>favourably to grit blasting.\u201d<\/i><\/strong><\/span><\/h3>\n<p class=\"p1\"><span class=\"s1\">Specifically, the following results for the initial states A, C and cold-rolled were obtained using new bristle blaster brushes <\/span><span class=\"s1\" style=\"color: #ff0000;\">(see Table 2 in the PDF download below)<\/span><span class=\"s1\">:<\/span><\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/2&#8243;][vc_column_text]<\/p>\n<p class=\"p1\"><span class=\"s1\" style=\"color: #879ca1;\"><strong>Bristle Blast Roughing<\/strong><\/span><br \/>\n(23mm wide)<\/p>\n<p>Rz: 74 &#8211; 92 \u03bcm (exceeding by 60 \u03bcm)<br \/>\nRPc: 20-22 peaks\/cm[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_column_text]<\/p>\n<p class=\"p1\"><span class=\"s1\" style=\"color: #879ca1;\"><strong>Bristle Blast Roughing<br \/>\n<\/strong><\/span>(2 x11 mm wide)<\/p>\n<p>Rz: 60 \u03bcm reached twice (61 &#8211; 84 \u03bcm), once 54 \u03bcm<br \/>\nRPc: 22-24 peaks\/cm[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/2&#8243;][vc_single_image image=&#8221;26087&#8243; img_size=&#8221;full&#8221;][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_empty_space][vc_column_text]<\/p>\n<h4 class=\"p1\"><span class=\"s1\" style=\"color: #ff0000;\"><strong>Comparison:<br \/>\n<\/strong><\/span><\/h4>\n<p class=\"p1\"><strong>Grit blasting<\/strong><\/p>\n<p>Rz: 69 &#8211; 75 \u03bcm (exceeding by 60 \u03bcm)<br \/>\nRPc: 26 &#8211; 30 peaks\/cm[\/vc_column_text][vc_separator color=&#8221;black&#8221;][vc_column_text]<\/p>\n<p class=\"p1\"><b>Rotating Wire Brush<\/b><\/p>\n<p>Rz: 7 &#8211; 24 \u03bcm<br \/>\nRPc: 11-32 peaks\/cm[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/2&#8243;][vc_column_text]<\/p>\n<p class=\"p1\"><span class=\"s1\">The Bristle Blaster using 23mm or 2 x 11mm belts achieved roughness profiles very similar to grit blasting, although there was some inconsistency with the 2 x 11mm belts.<span class=\"Apple-converted-space\">\u00a0 <\/span>Both surface roughness Rz and peak count RPc were also substantially similar. <\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">The conventional rotating wire brush on the other hand only produced a roughness Rz of 7-24 um. As such, this method only meets the requirements for coating with restrictions.<\/span><\/p>\n<p>[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_single_image image=&#8221;26093&#8243; img_size=&#8221;medium&#8221;][\/vc_column][\/vc_row][\/vc_section][vc_section full_width=&#8221;stretch_row&#8221; el_class=&#8221;textcomp&#8221; css=&#8221;.vc_custom_1589962315313{margin-top: -10px !important;margin-bottom: 0px !important;}&#8221;][vc_row][vc_column][vc_empty_space][\/vc_column][\/vc_row][vc_row][vc_column][vc_single_image image=&#8221;26155&#8243; img_size=&#8221;full&#8221;][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h4 class=\"p1\"><span class=\"s1\" style=\"color: #000000;\"><strong>4.1<\/strong><\/span> <span class=\"s1\" style=\"color: #ff0000;\">Coating System and Required Parameters<\/span><\/h4>\n<p class=\"p1\"><span class=\"s1\">The surface preparation methods were tested on coating systems having a total thickness of 60 um, which is suitable for the C3 medium-term corrosivity category. And tolerates a surface preparation by manual mechanic methods:<\/span><\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/2&#8243;][vc_column_text]<\/p>\n<h4><span class=\"s1\" style=\"color: #ff0000;\">Primer<\/span><\/h4>\n<p>Epoxy resin esters, recommended coating thickness: 80 \u03bcm Penetrating Agent[\/vc_column_text][vc_separator color=&#8221;black&#8221;][vc_column_text]<\/p>\n<h4><span class=\"s1\" style=\"color: #ff0000;\">Topcoat<\/span><\/h4>\n<p class=\"p1\">Alkyl acrylate, synthetic resin combination, recommended coating thickness: 80 \u03bcm<\/p>\n<p><a name=\"exposure\"><\/a>[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_single_image image=&#8221;26161&#8243; img_size=&#8221;250&#215;250&#8243;][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<p class=\"p1\"><strong><span class=\"s1\" style=\"color: #ff0000;\">According to DIN EN ISO 12944-6:1998, the following parameters are required for artificial corrosion exposure:<\/span><\/strong><\/p>\n<p class=\"p1\"><span class=\"s1\">\u2022 Cross-cut parameter (DIN EN ISO 2409): <\/span><span class=\"s1\">0 or 1<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">\u2022 <\/span>Pull-off test (DIN EN ISO 4624): <span class=\"s1\">no fracture to the underground (A\/B) permitted (except for pull-off values of 5 MPa and more)<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">\u2022 Degree of blistering (DIN EN ISO 4628-2): <\/span><span class=\"s1\">0 (SO)<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">\u2022 <\/span>Degree of rust (DIN EN ISO 4628-3): Ri 0<\/p>\n<p class=\"p1\"><span class=\"s1\">\u2022 <\/span>Degree of cracking (DIN EN ISO 4628-4): <span class=\"s1\">0 (SO)<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">\u2022 <\/span>Degree of flaking (DIN EN ISO 4628-5): <span class=\"s1\">0 (SO)<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">\u2022 <\/span>Corrosion at the scribe (DIN EN ISO 4628-8): <span class=\"s1\">1 mm (maximum value)<\/span><\/p>\n<p>[\/vc_column_text][vc_column_text]<\/p>\n<h6 class=\"p1\">The sample coupons were prepared individually on the front only by blasting or brushing.<\/h6>\n<p>[\/vc_column_text][vc_empty_space][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/2&#8243;][vc_single_image image=&#8221;26167&#8243; img_size=&#8221;250&#215;250&#8243;][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_column_text]<\/p>\n<h4 class=\"p1\"><b><span class=\"s1\" style=\"color: #000000;\">4.2 <\/span><span class=\"s1\" style=\"color: #879ca1;\">Exposure to Continuous Condensation According to DIN EN ISO 6270-1<\/span><\/b><\/h4>\n<p>[\/vc_column_text][vc_column_text]<\/p>\n<p class=\"p1\"><span class=\"s1\">The following results were obtained after exposing coated coupons to continuous condensation according to DIN EN ISO 6270-1 over a term of 120 hours <\/span><span class=\"s1\" style=\"color: #ff0000;\">(see Table 3 and 4 in the PDF download below)<\/span><span class=\"s1\">:<\/span><\/p>\n<p class=\"p1\">\u2022 Preparation Methods: bristle blast roughening, blasting, grit blasting, rotating wire brushing<\/p>\n<p class=\"p1\">\u2022 Initial States: A (thin mill scale), cold-rolled (K)<\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h4><strong><span class=\"s1\" style=\"color: #ff0000;\">Results<\/span><\/strong><\/h4>\n<p class=\"p1\">\u2022 Cross-cut parameter: failed (except A Sa 2 \u00bd, blasting)<\/p>\n<p class=\"p1\">\u2022 Fracture of adhesion A\/B: passed (generally no adhesive failure of the coating)<\/p>\n<p class=\"p1\">\u2022 Degree of blistering: passed<\/p>\n<p class=\"p1\">\u2022 Degree of rusting: passed<\/p>\n<p class=\"p1\">\u2022 Degree of cracking: passed<\/p>\n<p class=\"p1\">\u2022 Degree of flaking: passed<\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<p class=\"p1\"><span class=\"s1\">Regardless of the preparation method and the initial state, largely similar results were obtained after 120 hours of continuous exposure to condensation (DIN EN ISO 6270-1).<\/span><\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h4 class=\"p1\"><span class=\"s1\" style=\"color: #000000;\"><b>4.3 <\/b><\/span> <span class=\"s1\" style=\"color: #879ca1;\"> Exposure to Neutral Salt Mist <b>According to DIN EN ISO 9227<\/b><\/span><\/h4>\n<p>[\/vc_column_text][vc_column_text]<\/p>\n<p class=\"p1\"><span class=\"s1\">The following results were obtained after exposure of coated coupons to neutral salt mist according to DIN EN ISO 9227 over duration of 240 hours <\/span><span class=\"s1\" style=\"color: #ff0000;\">(see Tables 5 and 6 in the PDF download below)<\/span><span class=\"s1\">:<\/span><\/p>\n<p class=\"p1\">\u2022 Preparation Method: bristle blast roughening,<span class=\"Apple-converted-space\">\u00a0<\/span>grit blasting, rotating wire brushing<\/p>\n<p class=\"p1\">\u2022 Initial States: A (thin mill scale), cold-rolled (K)<\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/2&#8243;][vc_column_text]<\/p>\n<h4><span class=\"s1\" style=\"color: #ff0000;\">Results<\/span><\/h4>\n<p class=\"p1\">\u2022 Cross-cut parameter: failed<\/p>\n<p class=\"p1\">\u2022 Fracture of adhesion A\/B: passed (generally no adhesive fracture)<\/p>\n<p class=\"p1\">\u2022 Degree of blistering: passed<\/p>\n<p class=\"p1\">\u2022 Degree of rusting: passed<\/p>\n<p class=\"p1\">\u2022 Degree of cracking: passed<\/p>\n<p class=\"p1\">\u2022 Degree of flaking: passed<\/p>\n<p>[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_column_text]<\/p>\n<h6><span class=\"s1\" style=\"color: #ff0000;\"> Corrosion at the scribe (maximum value)<\/span><\/h6>\n<p class=\"p1\">\u2022 Bristle Blast Roughing: partially passed<\/p>\n<p class=\"p1\">\u2022 Grit Blasting: partially passed<\/p>\n<p class=\"p1\">\u2022 Conventional Brushing: passed<\/p>\n<p>[\/vc_column_text][vc_column_text]<\/p>\n<h6><span class=\"s1\" style=\"color: #ff0000;\">Delamination at the scribe (mean)<\/span><\/h6>\n<p class=\"p1\">\u2022 Bristle Blast Roughing: 7 &#8211; 10 mm<\/p>\n<p class=\"p1\">\u2022 Grit Blasting: A: 8 &#8211; 10 mm, cold-rolled: 4 &#8211; 5 mm<\/p>\n<p class=\"p1\">\u2022 Conventional Brushing: 13 &#8211; 20 mm<\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<p class=\"p1\"><span class=\"s1\">Regardless of the preparation method and the initial state, largely similar results were obtained after 240 hours of exposure to neutral salt mist (DIN EN ISO 9227). Delamination at the scribe is an exception. This value increases with conventional brushing by about two times up to 20 mm.<\/span><\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_empty_space][\/vc_column][\/vc_row][vc_row][vc_column][vc_single_image image=&#8221;26173&#8243; img_size=&#8221;500&#215;127&#8243;][\/vc_column][\/vc_row][vc_row][vc_column][vc_empty_space height=&#8221;50px&#8221;][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/2&#8243;][vc_column_text]<\/p>\n<p class=\"p1\"><span class=\"s1\">Both Bristle blast roughening and grit blasting achieved similar degrees of surface preparation largely corresponding to Sa 2\u00bd.<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">Bristle blasting using fresh belts led to a surface roughening normally between 60 and 80 \u03bcm.<span class=\"Apple-converted-space\">\u00a0 <\/span>The surface roughness Rz corresponds to a medium degree of roughness (G) according to DIN EN ISO 8503-1 which ranges from 60-100\u03bcm.<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">Coated coupons prepared with bristle blast roughening behaved similar to those prepared with grit blasting after exposure to continuous condensation.<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">All methods tested compared favourably when subjected to salt mist.<span class=\"Apple-converted-space\">\u00a0 <\/span>The degree of delamination of the coupon at the scribe however approximately doubled when prepared by the convention rotating brush method.<\/span><\/p>\n<p>[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_single_image image=&#8221;26179&#8243; img_size=&#8221;full&#8221;][\/vc_column][\/vc_row][\/vc_section][vc_section full_width=&#8221;stretch_row&#8221; el_class=&#8221;textcomp&#8221; css=&#8221;.vc_custom_1589962373636{margin-top: -10px !important;}&#8221;][vc_row][vc_column][vc_empty_space][vc_separator color=&#8221;custom&#8221; style=&#8221;shadow&#8221; border_width=&#8221;2&#8243; accent_color=&#8221;#a5adb0&#8243;][vc_empty_space][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h3><a href=\"https:\/\/heyzine.com\/flip-book\/fdde03836d.html\" target=\"_blank\" rel=\"noopener\">Download Dr. Prepper No. 8<\/a><\/h3>\n<p>You can also download the complete Dr. Prepper edition:[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/2&#8243;][vc_btn title=&#8221;Dr. Prepper No. 1&#8243; style=&#8221;classic&#8221; shape=&#8221;square&#8221; align=&#8221;left&#8221; link=&#8221;url:https%3A%2F%2Fheyzine.com%2Fflip-book%2Ffedfab452b.html|title:Dr.%20Prepper%20No.%201|target:_blank&#8221; el_class=&#8221;hometopfotobutton&#8221;][vc_empty_space height=&#8221;10px&#8221;][vc_btn title=&#8221;Dr. Prepper No. 3&#8243; style=&#8221;classic&#8221; shape=&#8221;square&#8221; align=&#8221;left&#8221; link=&#8221;url:https%3A%2F%2Fheyzine.com%2Fflip-book%2Ff58c97a2cf.html|title:Dr.%20Prepper%20No.%203|target:_blank&#8221; el_class=&#8221;hometopfotobutton&#8221;][vc_empty_space height=&#8221;10px&#8221;][vc_btn title=&#8221;Dr. Prepper No. 5&#8243; style=&#8221;classic&#8221; shape=&#8221;square&#8221; align=&#8221;left&#8221; link=&#8221;url:https%3A%2F%2Fheyzine.com%2Fflip-book%2Ffa5650607d.html%23page%2F1|title:Dr.%20Prepper%20No.%205|target:_blank&#8221; el_class=&#8221;hometopfotobutton&#8221;][vc_empty_space height=&#8221;10px&#8221;][vc_btn title=&#8221;Dr. Prepper No. 7&#8243; style=&#8221;classic&#8221; shape=&#8221;square&#8221; align=&#8221;left&#8221; link=&#8221;url:https%3A%2F%2Fheyzine.com%2Fflip-book%2F1234e3bd78.html|title:Dr.%20Prepper%20No.%207|target:_blank&#8221; el_class=&#8221;hometopfotobutton&#8221;][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_btn title=&#8221;Dr. Prepper No. 2&#8243; style=&#8221;classic&#8221; shape=&#8221;square&#8221; align=&#8221;left&#8221; link=&#8221;url:https%3A%2F%2Fheyzine.com%2Fflip-book%2F39528c7f76.html|title:Dr.%20Prepper%20No.%202|target:_blank&#8221; el_class=&#8221;hometopfotobutton&#8221;][vc_empty_space height=&#8221;10px&#8221;][vc_btn title=&#8221;Dr. Prepper No. 4&#8243; style=&#8221;classic&#8221; shape=&#8221;square&#8221; align=&#8221;left&#8221; link=&#8221;url:https%3A%2F%2Fheyzine.com%2Fflip-book%2F2be7d30897.html%23page%2F1|title:Dr.%20Prepper%20No.%204|target:_blank&#8221; el_class=&#8221;hometopfotobutton&#8221;][vc_empty_space height=&#8221;10px&#8221;][vc_btn title=&#8221;Dr. Prepper No. 6&#8243; style=&#8221;classic&#8221; shape=&#8221;square&#8221; align=&#8221;left&#8221; link=&#8221;url:https%3A%2F%2Fheyzine.com%2Fflip-book%2Ff8221e3f3c.html|title:Dr.%20Prepper%20No.%206|target:_blank&#8221; el_class=&#8221;hometopfotobutton&#8221;][\/vc_column][\/vc_row][\/vc_section]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_section full_width=&#8221;stretch_row&#8221; content_placement=&#8221;bottom&#8221; css=&#8221;.vc_custom_1569320141112{padding-top: 30px !important;padding-bottom: 0px !important;background-color: #ff1212 !important;background-position: center &#8230; <\/p>\n","protected":false},"author":19,"featured_media":0,"parent":10546,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"class_list":["post-26259","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/montipower.com\/es\/wp-json\/wp\/v2\/pages\/26259","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/montipower.com\/es\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/montipower.com\/es\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/montipower.com\/es\/wp-json\/wp\/v2\/users\/19"}],"replies":[{"embeddable":true,"href":"https:\/\/montipower.com\/es\/wp-json\/wp\/v2\/comments?post=26259"}],"version-history":[{"count":6,"href":"https:\/\/montipower.com\/es\/wp-json\/wp\/v2\/pages\/26259\/revisions"}],"predecessor-version":[{"id":46604,"href":"https:\/\/montipower.com\/es\/wp-json\/wp\/v2\/pages\/26259\/revisions\/46604"}],"up":[{"embeddable":true,"href":"https:\/\/montipower.com\/es\/wp-json\/wp\/v2\/pages\/10546"}],"wp:attachment":[{"href":"https:\/\/montipower.com\/es\/wp-json\/wp\/v2\/media?parent=26259"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}