{"id":19039,"date":"2026-10-13T13:41:36","date_gmt":"2026-10-13T05:41:36","guid":{"rendered":"https:\/\/www.wehopower.com\/news\/power-supply-conformal-coating-coverage\/"},"modified":"2026-10-19T12:05:30","modified_gmt":"2026-10-19T04:05:30","slug":"power-supply-conformal-coating-coverage","status":"publish","type":"news","link":"https:\/\/www.wehopower.com\/ur\/news\/power-supply-conformal-coating-coverage\/","title":{"rendered":"Power Supply Conformal Coating: Ask for Coverage, Not an Undefined Level"},"content":{"rendered":"<p><strong>When buying a conformal-coated power supply, ask what is coated, with which material and against which acceptance requirements.<\/strong> A phrase such as \u201chigh-level protection\u201d is not enough to compare two offers. Do not infer a coating grade from a metal cover, a plastic housing or a photograph of the supply inside a cabinet.<\/p>\n<figure data-image-role=\"application_a\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/01-application-a-50.png?quality=85&#038;strip=all\" alt=\"Power Supply Conformal Coating: Ask for Coverage, Not an Undefined Level  title=\" width=\"1536\" height=\"1024\" power supply conformal coating: ask for not an undefined level title =\"\"><figcaption>An illustrative dry pump-house control compartment separates the electronics from the outdoor environment. It does not establish a coating specification or verified pump-system compatibility.<\/figcaption><\/figure>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u0645\u0646\u062f\u0631\u062c\u0627\u062a \u06a9\u0627 \u062c\u062f\u0648\u0644<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">\u0679\u0648\u06af\u0644 \u06a9\u0631\u06cc\u06ba\u06d4<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.wehopower.com\/ur\/news\/power-supply-conformal-coating-coverage\/#Turn_the_word_%E2%80%9Clevel%E2%80%9D_into_a_defined_requirement\" >Turn the word \u201clevel\u201d into a defined requirement<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.wehopower.com\/ur\/news\/power-supply-conformal-coating-coverage\/#Keep_coating_potting_and_the_enclosure_separate\" >Keep coating, potting and the enclosure separate<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.wehopower.com\/ur\/news\/power-supply-conformal-coating-coverage\/#Coverage_and_process_are_part_of_the_evidence\" >Coverage and process are part of the evidence<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.wehopower.com\/ur\/news\/power-supply-conformal-coating-coverage\/#What_the_MDR-20-12_photograph_can_establish\" >What the MDR-20-12 photograph can establish<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.wehopower.com\/ur\/news\/power-supply-conformal-coating-coverage\/#Write_an_RFQ_that_prevents_an_ambiguous_answer\" >Write an RFQ that prevents an ambiguous answer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.wehopower.com\/ur\/news\/power-supply-conformal-coating-coverage\/#Confirm_the_offered_product_before_approving_it\" >Confirm the offered product before approving it<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.wehopower.com\/ur\/news\/power-supply-conformal-coating-coverage\/#Common_buyer_questions\" >Common buyer questions<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.wehopower.com\/ur\/news\/power-supply-conformal-coating-coverage\/#Can_I_check_coating_from_an_external_photograph\" >Can I check coating from an external photograph?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.wehopower.com\/ur\/news\/power-supply-conformal-coating-coverage\/#Does_more_coating_always_mean_better_protection\" >Does more coating always mean better protection?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.wehopower.com\/ur\/news\/power-supply-conformal-coating-coverage\/#Can_the_cabinet_alone_settle_the_selection\" >Can the cabinet alone settle the selection?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Turn_the_word_%E2%80%9Clevel%E2%80%9D_into_a_defined_requirement\"><\/span>Turn the word \u201clevel\u201d into a defined requirement<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Suppliers may use different descriptions for coating options. Before comparing those descriptions, establish whether they refer to a material, a coverage pattern, a process option or a tested product configuration. If a standard or test is cited, ask for its exact reference, edition where relevant, acceptance criteria and the offered model revision to which the evidence applies.<\/p>\n<p>A useful purchase specification describes the operating environment first: expected moisture or condensation, dust, chemicals, temperature changes, ventilation and maintenance access. The supplier can then identify whether the proposed power supply and host protection are suitable or whether a different construction is required.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Keep_coating_potting_and_the_enclosure_separate\"><\/span>Keep coating, potting and the enclosure separate<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<table>\n<thead>\n<tr>\n<th>\u0622\u0626\u0679\u0645<\/th>\n<th>Question to resolve<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Conformal coating<\/td>\n<td>Which board surfaces and components receive the specified protective film?<\/td>\n<\/tr>\n<tr>\n<td>Potting or encapsulation<\/td>\n<td>Which volume is filled, with what material and with which thermal or service implications?<\/td>\n<\/tr>\n<tr>\n<td>Product enclosure<\/td>\n<td>What openings, terminals and ventilation remain exposed?<\/td>\n<\/tr>\n<tr>\n<td>Host cabinet<\/td>\n<td>What environmental conditions reach the installed supply through doors, entries and ventilation?<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>These are not successive grades on one universal scale. A requirement for one does not document the others. In particular, do not translate a coating description into an ingress-protection rating or assume that treatment of the PCB protects every connector and opening.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Coverage_and_process_are_part_of_the_evidence\"><\/span>Coverage and process are part of the evidence<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Ask for the coverage definition and any intentionally excluded areas. Connectors, adjustment features and other interfaces may impose requirements that cannot be answered by stating a material name alone. Also ask how the specified application and cure are controlled and how coverage is inspected.<\/p>\n<p>Review selective application, cure and inspection of coating coverage as separate process questions. Request evidence for the actual material and process used on the ordered unit; a generic coating description does not establish what WEHO uses in the product shown here.<\/p>\n<figure data-image-role=\"product_detail\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/03-product-detail-47.png?quality=85&#038;strip=all\" alt=\"Power Supply Conformal Coating: Ask for Coverage, Not an Undefined Level  title=\" width=\"1536\" height=\"1024\" power supply conformal coating: ask for not an undefined level title =\"\"><figcaption>The original photograph establishes the external product identity. It cannot show whether an internal board is coated or establish the scope of an environmental test.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"What_the_MDR-20-12_photograph_can_establish\"><\/span>What the MDR-20-12 photograph can establish<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The photographed WEHO MDR-20-12 is a 12 V, 1.67 A DIN-rail supply with a vented plastic case. Its original photograph and matching sheet establish its model and external construction. The supplied sheet does not state a conformal-coating material, coverage map or coating qualification for this sample.<\/p>\n<p>We therefore do not describe this unit as coated, waterproof or suitable for direct exposure to a dusty or wet process. The application images show dry host compartments to explain the installation question; they are not environmental test evidence. Request the applicable offered configuration before specifying additional protection.<\/p>\n<figure data-image-role=\"application_b\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/02-application-b-48.png?quality=85&#038;strip=all\" alt=\"Power Supply Conformal Coating: Ask for Coverage, Not an Undefined Level  title=\" width=\"1536\" height=\"1024\" power supply conformal coating: ask for not an undefined level title =\"\"><figcaption>An isolated cabinet-layout example near a dusty process. The supply terminals remain empty; the scene is not evidence of dust protection, coating or operational acceptance.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Write_an_RFQ_that_prevents_an_ambiguous_answer\"><\/span>Write an RFQ that prevents an ambiguous answer<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Include the full model, required output, site environment and host-cabinet design. State whether condensation, chemical exposure or frequent door opening is foreseeable. Ask the supplier to distinguish a standard feature from a special option and to identify any changed part number or revision.<\/p>\n<p>Then request the relevant material and coverage description, exclusions, process evidence, environmental test scope and service limitations. Keep thermal performance, clearances and maintenance requirements in the review. Adding a protective treatment after delivery should not be treated as an informal workshop improvement: it can change the product and requires the manufacturer&#8217;s guidance.<\/p>\n<figure data-image-role=\"engineering_context\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/04-engineering-context-51.png?quality=85&#038;strip=all\" alt=\"Power Supply Conformal Coating: Ask for Coverage, Not an Undefined Level  title=\" width=\"1536\" height=\"1024\" power supply conformal coating: ask for not an undefined level title =\"\"><figcaption>Keep component treatment and host-cabinet design as separate, documented requirements.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Confirm_the_offered_product_before_approving_it\"><\/span>Confirm the offered product before approving it<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Use the <a href=\"https:\/\/www.wehopower.com\/ur\/product\/100-guarantee-mdr-series-20w-5v-12v-24v-switching-power-supply\/\">MDR family information<\/a> to identify the electrical product, then <a href=\"https:\/\/www.wehopower.com\/ur\/contact\/\">send WEHO the environmental requirement<\/a>. Ask for a written response covering the delivered model and option rather than accepting a general statement about a product family.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Common_buyer_questions\"><\/span>Common buyer questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Can_I_check_coating_from_an_external_photograph\"><\/span>Can I check coating from an external photograph?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Not reliably. A case photograph does not document internal coverage, material or process acceptance.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Does_more_coating_always_mean_better_protection\"><\/span>Does more coating always mean better protection?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Do not assume that. The specified material, application and product design must be considered together; request the defined process rather than a subjective thickness preference.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_the_cabinet_alone_settle_the_selection\"><\/span>Can the cabinet alone settle the selection?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No. Review the environment reaching the supply and its documented limits as part of the completed equipment. A cabinet description does not automatically qualify the component inside it.<\/p>","protected":false},"excerpt":{"rendered":"<p>A coating claim needs a defined material, coverage and acceptance scope. A product case or application photograph cannot establish what is on the internal PCB.<\/p>","protected":false},"author":2,"featured_media":19035,"parent":0,"menu_order":75,"comment_status":"closed","ping_status":"","template":"","format":"standard","meta":{"_acf_changed":false,"_joinchat":[],"footnotes":""},"news_category":[149,284],"class_list":["post-19039","news","type-news","status-publish","format-standard","has-post-thumbnail","hentry","news_category-blog","news_category-product-articles","entry"],"acf":[],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/news\/19039","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/news"}],"about":[{"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/types\/news"}],"author":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/comments?post=19039"}],"version-history":[{"count":1,"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/news\/19039\/revisions"}],"predecessor-version":[{"id":19614,"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/news\/19039\/revisions\/19614"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/media\/19035"}],"wp:attachment":[{"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/media?parent=19039"}],"wp:term":[{"taxonomy":"news_category","embeddable":true,"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/news_category?post=19039"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}