{"id":1997,"date":"2024-06-10T18:54:15","date_gmt":"2024-06-10T16:54:15","guid":{"rendered":"https:\/\/centrotest.roiweb.eu\/penetrant-liquid-testing-pt\/"},"modified":"2024-08-11T16:18:27","modified_gmt":"2024-08-11T14:18:27","slug":"penetrant-liquid-testing-pt","status":"publish","type":"page","link":"https:\/\/centrotest.com\/en\/non-destructive-testing\/penetrant-liquid-testing-pt\/","title":{"rendered":"Penetrant liquid testing (PT)"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"1997\" class=\"elementor elementor-1997 elementor-658\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f99e575 e-flex e-con-boxed e-con e-parent\" data-id=\"f99e575\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\" data-core-v316-plus=\"true\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-565845f elementor-widget elementor-widget-breadcrumbs\" data-id=\"565845f\" data-element_type=\"widget\" data-widget_type=\"breadcrumbs.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<link rel=\"stylesheet\" href=\"https:\/\/centrotest.com\/wp-content\/plugins\/elementor-pro\/assets\/css\/widget-theme-elements.min.css\"><p id=\"breadcrumbs\"><span><span><a href=\"https:\/\/centrotest.com\/\">Home<\/a><\/span><\/span><\/p>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-380bfd46 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"380bfd46\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-wide\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-3057bc4d\" data-id=\"3057bc4d\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1b7087d1 elementor-widget elementor-widget-heading\" data-id=\"1b7087d1\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.20.0 - 26-03-2024 *\/\n.elementor-heading-title{padding:0;margin:0;line-height:1}.elementor-widget-heading .elementor-heading-title[class*=elementor-size-]>a{color:inherit;font-size:inherit;line-height:inherit}.elementor-widget-heading .elementor-heading-title.elementor-size-small{font-size:15px}.elementor-widget-heading .elementor-heading-title.elementor-size-medium{font-size:19px}.elementor-widget-heading .elementor-heading-title.elementor-size-large{font-size:29px}.elementor-widget-heading .elementor-heading-title.elementor-size-xl{font-size:39px}.elementor-widget-heading .elementor-heading-title.elementor-size-xxl{font-size:59px}<\/style><h5 class=\"elementor-heading-title elementor-size-default\">PENETRANT LIQUID TESTING (PT)<\/h5>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b2185b4 elementor-widget elementor-widget-text-editor\" data-id=\"b2185b4\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.20.0 - 26-03-2024 *\/\n.elementor-widget-text-editor.elementor-drop-cap-view-stacked .elementor-drop-cap{background-color:#69727d;color:#fff}.elementor-widget-text-editor.elementor-drop-cap-view-framed .elementor-drop-cap{color:#69727d;border:3px solid;background-color:transparent}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap{margin-top:8px}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap-letter{width:1em;height:1em}.elementor-widget-text-editor .elementor-drop-cap{float:left;text-align:center;line-height:1;font-size:50px}.elementor-widget-text-editor .elementor-drop-cap-letter{display:inline-block}<\/style>\t\t\t\t<p>The physical principle on which this techinque is based exploits the ability of some liquids to <strong>penetrate by capillarity<\/strong> into slots, cavities or outcropping cracks, even if thin.<\/p>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-26a4aade\" data-id=\"26a4aade\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-93a459d elementor--h-position-center elementor--v-position-middle elementor-arrows-position-inside elementor-widget elementor-widget-slides\" data-id=\"93a459d\" data-element_type=\"widget\" data-settings=\"{&quot;navigation&quot;:&quot;arrows&quot;,&quot;autoplay_speed&quot;:2500,&quot;transition&quot;:&quot;fade&quot;,&quot;transition_speed&quot;:100,&quot;autoplay&quot;:&quot;yes&quot;,&quot;pause_on_hover&quot;:&quot;yes&quot;,&quot;pause_on_interaction&quot;:&quot;yes&quot;,&quot;infinite&quot;:&quot;yes&quot;}\" data-widget_type=\"slides.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor-pro - v3.20.0 - 26-03-2024 *\/\n.elementor-slides .swiper-slide-bg{background-size:cover;background-position:50%;background-repeat:no-repeat;min-width:100%;min-height:100%}.elementor-slides .swiper-slide-inner{background-repeat:no-repeat;background-position:50%;position:absolute;top:0;left:0;bottom:0;right:0;padding:50px;margin:auto}.elementor-slides .swiper-slide-inner,.elementor-slides 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.elementor-slide-description{font-size:13px;line-height:1.4;margin-bottom:15px}}<\/style>\t\t<div class=\"elementor-swiper\">\n\t\t\t<div class=\"elementor-slides-wrapper elementor-main-swiper swiper\" dir=\"ltr\" data-animation=\"fadeInUp\">\n\t\t\t\t<div class=\"swiper-wrapper elementor-slides\">\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-repeater-item-f5f0c3f swiper-slide\"><div class=\"swiper-slide-bg elementor-ken-burns elementor-ken-burns--in\" role=\"img\"><\/div><div class=\"swiper-slide-inner\" ><div class=\"swiper-slide-contents\"><\/div><\/div><\/div><div class=\"elementor-repeater-item-7df4d0c swiper-slide\"><div class=\"swiper-slide-bg elementor-ken-burns elementor-ken-burns--in\" role=\"img\"><\/div><div class=\"swiper-slide-inner\" ><div class=\"swiper-slide-contents\"><\/div><\/div><\/div><div class=\"elementor-repeater-item-dd5d907 swiper-slide\"><div class=\"swiper-slide-bg elementor-ken-burns elementor-ken-burns--in\" role=\"img\"><\/div><div 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854C617 867 629 875 646 875 663 875 679 871 692 858 704 846 713 829 713 812 713 796 708 779 692 767L438 487 692 225C700 217 708 204 708 187 708 171 704 154 692 142 675 129 663 125 646 125Z\"><\/path><\/svg>\t\t\t\t\t\t\t<span class=\"elementor-screen-only\">Previous slide<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<div class=\"elementor-swiper-button elementor-swiper-button-next\" role=\"button\" tabindex=\"0\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-eicon-chevron-right\" viewBox=\"0 0 1000 1000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M696 533C708 521 713 504 713 487 713 471 708 454 696 446L400 146C388 133 375 125 354 125 338 125 325 129 313 142 300 154 292 171 292 187 292 204 296 221 308 233L563 492 304 771C292 783 288 800 288 817 288 833 296 850 308 863 321 871 338 875 354 875 371 875 388 867 400 854L696 533Z\"><\/path><\/svg>\t\t\t\t\t\t\t<span class=\"elementor-screen-only\">Next slide<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-e677cd5 animated-slow elementor-section-boxed elementor-section-height-default elementor-section-height-default elementor-invisible\" data-id=\"e677cd5\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;animation&quot;:&quot;fadeInUp&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-wide\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-66 elementor-top-column elementor-element elementor-element-6457a9e1\" data-id=\"6457a9e1\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-2e64f7d elementor-widget elementor-widget-text-editor\" data-id=\"2e64f7d\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>The liquid can be applied in several ways: <strong> spray, brush and diving<\/strong>. The surfaces to be tested, however, must be perfectly degreased and free from any obstruction.<\/p>\n<p>After penetration, the excess liquid is removed from the surface, usually with water; the washing, however, does not remove the liquid contained in the cracks which can not be reached by normal liquids.<\/p>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b795cff elementor-widget elementor-widget-text-editor\" data-id=\"b795cff\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><strong>CHECKABLE PRODUCTS<\/strong><\/p>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e4f1518 elementor-widget elementor-widget-text-editor\" data-id=\"e4f1518\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Rolleds, forgeds, drawns, castings, welds. Defects in castings, as cold joints and shrinkage cracks, can be detected with this method.<\/p>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3df95e3 elementor-widget elementor-widget-text-editor\" data-id=\"3df95e3\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><strong>ADVANTAGES<\/strong><\/p>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-05dd2b0 elementor-widget elementor-widget-text-editor\" data-id=\"05dd2b0\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>The advantage of this technique is that it can be used on non-ferromagnetic materials. It&#8217;s also very fast and economical.<\/p>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-718adac elementor-widget elementor-widget-text-editor\" data-id=\"718adac\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><strong>DISADVANTAGES<\/strong><\/p>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-850312a elementor-widget elementor-widget-text-editor\" data-id=\"850312a\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>It can&#8217;t be used in painted or porous materials, in threaded surfaces or ones with a too complex geometry, in cast iron and in sintered steel. Like magnetic particle testing, it&#8217;s a technique used only for <strong>surface defects.<\/strong><\/p>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4262d17 elementor-widget elementor-widget-text-editor\" data-id=\"4262d17\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>ALTERNATIVE METHODS<\/p>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5c904bc elementor-widget elementor-widget-text-editor\" data-id=\"5c904bc\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>In addition to the traditional method, checks are also performed with fluorescent penetrant liquid using a Wood&#8217;s lamp.<\/p>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6f9e6a4 elementor-widget elementor-widget-text-editor\" data-id=\"6f9e6a4\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>MAIN REFERENCE STANDARDS<\/p>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-42b5599 elementor-widget elementor-widget-text-editor\" data-id=\"42b5599\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<ul>\n<li>EN 970, UNI EN 10228-2<\/li>\n<li>ASME V Art. 6<\/li>\n<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-29c0423\" data-id=\"29c0423\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-8332866 elementor-widget elementor-widget-image\" data-id=\"8332866\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.20.0 - 26-03-2024 *\/\n.elementor-widget-image{text-align:center}.elementor-widget-image a{display:inline-block}.elementor-widget-image a img[src$=\".svg\"]{width:48px}.elementor-widget-image img{vertical-align:middle;display:inline-block}<\/style>\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/centrotest.com\/wp-content\/uploads\/2024\/06\/centrotest-controlli-liquidipenetranti4.jpg\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"centrotest controlli liquidi penetranti\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6NjY2LCJ1cmwiOiJodHRwczpcL1wvY2VudHJvdGVzdC5jb21cL3dwLWNvbnRlbnRcL3VwbG9hZHNcLzIwMjRcLzA2XC9jZW50cm90ZXN0LWNvbnRyb2xsaS1saXF1aWRpcGVuZXRyYW50aTQuanBnIn0%3D\">\n\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"700\" height=\"300\" src=\"https:\/\/centrotest.com\/wp-content\/uploads\/2024\/06\/centrotest-controlli-liquidipenetranti4.jpg\" class=\"attachment-large size-large wp-image-666\" alt=\"\" srcset=\"https:\/\/centrotest.com\/wp-content\/uploads\/2024\/06\/centrotest-controlli-liquidipenetranti4.jpg 700w, https:\/\/centrotest.com\/wp-content\/uploads\/2024\/06\/centrotest-controlli-liquidipenetranti4-300x129.jpg 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-609855c elementor-widget elementor-widget-image\" data-id=\"609855c\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/centrotest.com\/wp-content\/uploads\/2024\/06\/centrotest-controlli-liquidipenetranti2.jpg\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"centrotest controlli liquidipenetranti2\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6NjY1LCJ1cmwiOiJodHRwczpcL1wvY2VudHJvdGVzdC5jb21cL3dwLWNvbnRlbnRcL3VwbG9hZHNcLzIwMjRcLzA2XC9jZW50cm90ZXN0LWNvbnRyb2xsaS1saXF1aWRpcGVuZXRyYW50aTIuanBnIn0%3D\">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"700\" height=\"300\" src=\"https:\/\/centrotest.com\/wp-content\/uploads\/2024\/06\/centrotest-controlli-liquidipenetranti2.jpg\" class=\"attachment-large size-large wp-image-665\" alt=\"\" srcset=\"https:\/\/centrotest.com\/wp-content\/uploads\/2024\/06\/centrotest-controlli-liquidipenetranti2.jpg 700w, https:\/\/centrotest.com\/wp-content\/uploads\/2024\/06\/centrotest-controlli-liquidipenetranti2-300x129.jpg 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0a60d34 elementor-widget elementor-widget-image\" data-id=\"0a60d34\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/centrotest.com\/wp-content\/uploads\/2024\/06\/centrotest-controlli-liquidipenetranti2-1.jpg\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"centrotest controlli liquidipenetranti2 (1)\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6NjY0LCJ1cmwiOiJodHRwczpcL1wvY2VudHJvdGVzdC5jb21cL3dwLWNvbnRlbnRcL3VwbG9hZHNcLzIwMjRcLzA2XC9jZW50cm90ZXN0LWNvbnRyb2xsaS1saXF1aWRpcGVuZXRyYW50aTItMS5qcGcifQ%3D%3D\">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"700\" height=\"300\" src=\"https:\/\/centrotest.com\/wp-content\/uploads\/2024\/06\/centrotest-controlli-liquidipenetranti2-1.jpg\" class=\"attachment-large size-large wp-image-664\" alt=\"\" srcset=\"https:\/\/centrotest.com\/wp-content\/uploads\/2024\/06\/centrotest-controlli-liquidipenetranti2-1.jpg 700w, https:\/\/centrotest.com\/wp-content\/uploads\/2024\/06\/centrotest-controlli-liquidipenetranti2-1-300x129.jpg 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>PENETRANT LIQUID TESTING (PT) The physical principle on which this techinque is based exploits the ability of some liquids to penetrate by capillarity into slots, cavities or outcropping cracks, even if thin. Previous slide Next slide The liquid can be applied in several ways: spray, brush and diving. The surfaces to be tested, however, must [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":2083,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"elementor_header_footer","meta":{"footnotes":""},"class_list":["post-1997","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Penetrant liquid testing (PT) - CENTROTEST Terni<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/centrotest.com\/controlli-non-distruttivi\/controllo-con-liquidi-penetranti\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Penetrant liquid testing (PT) - CENTROTEST Terni\" \/>\n<meta property=\"og:description\" content=\"PENETRANT LIQUID TESTING (PT) The physical principle on which this techinque is based exploits the ability of some liquids to penetrate by capillarity into slots, cavities or outcropping cracks, even if thin. Previous slide Next slide The liquid can be applied in several ways: spray, brush and diving. 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