{"id":5296,"date":"2026-04-16T14:35:08","date_gmt":"2026-04-16T06:35:08","guid":{"rendered":"https:\/\/txjpcba.com\/?p=5296"},"modified":"2026-04-16T14:36:16","modified_gmt":"2026-04-16T06:36:16","slug":"how-to-avoid-contamination-during-coating","status":"publish","type":"post","link":"https:\/\/txjpcba.com\/ar\/how-to-avoid-contamination-during-coating\/","title":{"rendered":"How to avoid contamination during coating?"},"content":{"rendered":"<h3 data-section-id=\"1c2vmf1\" data-start=\"0\" data-end=\"46\">Avoid contamination during coating<\/h3>\n<p data-start=\"48\" data-end=\"357\">Contamination during <a href=\"https:\/\/txjpcba.com\/ar\/%d8%b7%d9%84%d8%a7%d8%a1-%d9%85%d8%b7%d8%a7%d8%a8%d9%82\/\"><strong data-start=\"69\" data-end=\"90\">\u0627\u0644\u0637\u0644\u0627\u0621 \u0627\u0644\u0645\u0637\u0627\u0628\u0642<\/strong><\/a> can lead to serious defects such as poor adhesion, bubbles, pinholes, and electrical leakage. In <strong data-start=\"188\" data-end=\"204\">\u062a\u062c\u0645\u064a\u0639 \u062b\u0646\u0627\u0626\u064a \u0627\u0644\u0641\u064a\u0646\u064a\u0644 \u0645\u062a\u0639\u062f\u062f \u0627\u0644\u0643\u0644\u0648\u0631<\/strong>, <strong data-start=\"206\" data-end=\"232\">\u062a\u062c\u0645\u064a\u0639 \u0627\u0644\u0646\u0645\u0648\u0630\u062c \u0627\u0644\u0623\u0648\u0644\u064a \u0644\u062b\u0646\u0627\u0626\u064a \u0627\u0644\u0641\u064a\u0646\u064a\u0644 \u0645\u062a\u0639\u062f\u062f \u0627\u0644\u0643\u0644\u0648\u0631<\/strong>, \u0648 <strong data-start=\"238\" data-end=\"254\">\u062a\u062c\u0645\u064a\u0639 SMT<\/strong>, preventing contamination is critical to ensure coating reliability and long-term product performance.<\/p>\n<figure id=\"attachment_5297\" aria-describedby=\"caption-attachment-5297\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-5297\" src=\"https:\/\/txjpcba.com\/wp-content\/uploads\/2026\/04\/How-to-avoid-contamination-during-coating.jpg\" alt=\"How to avoid contamination during coating\" width=\"800\" height=\"597\" srcset=\"https:\/\/txjpcba.com\/wp-content\/uploads\/2026\/04\/How-to-avoid-contamination-during-coating.jpg 800w, https:\/\/txjpcba.com\/wp-content\/uploads\/2026\/04\/How-to-avoid-contamination-during-coating-300x224.jpg 300w, https:\/\/txjpcba.com\/wp-content\/uploads\/2026\/04\/How-to-avoid-contamination-during-coating-768x573.jpg 768w, https:\/\/txjpcba.com\/wp-content\/uploads\/2026\/04\/How-to-avoid-contamination-during-coating-16x12.jpg 16w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-5297\" class=\"wp-caption-text\">How to avoid contamination during coating<\/figcaption><\/figure>\n<p data-start=\"359\" data-end=\"693\"><strong data-start=\"359\" data-end=\"404\">Ensure proper PCB cleaning before coating<\/strong><br data-start=\"404\" data-end=\"407\" \/>The most important step is removing all residues from the PCB surface. Flux residues, oils, dust, and fingerprints can interfere with coating adhesion. In <strong data-start=\"562\" data-end=\"578\">\u062a\u062c\u0645\u064a\u0639 \u062b\u0646\u0627\u0626\u064a \u0627\u0644\u0641\u064a\u0646\u064a\u0644 \u0645\u062a\u0639\u062f\u062f \u0627\u0644\u0643\u0644\u0648\u0631<\/strong>, use appropriate cleaning methods (aqueous or solvent cleaning) followed by thorough drying to eliminate moisture.<\/p>\n<p data-start=\"695\" data-end=\"936\"><strong data-start=\"695\" data-end=\"733\">Control the production environment<\/strong><br data-start=\"733\" data-end=\"736\" \/>A clean environment is essential during coating. Dust, airborne particles, and humidity can contaminate the coating surface. In <strong data-start=\"864\" data-end=\"880\">\u062a\u062c\u0645\u064a\u0639 SMT<\/strong>, coating is often performed in controlled areas with:<\/p>\n<ul data-start=\"937\" data-end=\"1025\">\n<li data-section-id=\"1pjhyjg\" data-start=\"937\" data-end=\"963\">Air filtration systems<\/li>\n<li data-section-id=\"1u4hva4\" data-start=\"964\" data-end=\"989\">Positive air pressure<\/li>\n<li data-section-id=\"1w9ye7v\" data-start=\"990\" data-end=\"1025\">Stable temperature and humidity<\/li>\n<\/ul>\n<p data-start=\"1027\" data-end=\"1284\"><strong data-start=\"1027\" data-end=\"1052\">Handle PCBs correctly<\/strong><br data-start=\"1052\" data-end=\"1055\" \/>Operators should avoid direct contact with PCB surfaces. Wearing gloves and using proper handling tools prevents contamination from skin oils or dirt, especially in <a href=\"https:\/\/txjpcba.com\/ar\/%d8%aa%d8%ac%d9%85%d9%8a%d8%b9-%d8%a7%d9%84%d9%86%d9%85%d9%88%d8%b0%d8%ac-%d8%a7%d9%84%d8%a3%d9%88%d9%84%d9%8a-%d9%84%d8%ab%d9%86%d8%a7%d8%a6%d9%8a-%d8%a7%d9%84%d9%81%d9%8a%d9%86%d9%8a%d9%84-%d9%85\/\"><strong data-start=\"1220\" data-end=\"1246\">\u062a\u062c\u0645\u064a\u0639 \u0627\u0644\u0646\u0645\u0648\u0630\u062c \u0627\u0644\u0623\u0648\u0644\u064a \u0644\u062b\u0646\u0627\u0626\u064a \u0627\u0644\u0641\u064a\u0646\u064a\u0644 \u0645\u062a\u0639\u062f\u062f \u0627\u0644\u0643\u0644\u0648\u0631<\/strong><\/a> where manual handling is more common.<\/p>\n<p data-start=\"1286\" data-end=\"1520\"><strong data-start=\"1286\" data-end=\"1329\">Use clean and well-maintained equipment<\/strong><br data-start=\"1329\" data-end=\"1332\" \/>Spray nozzles, coating tanks, and dispensing systems must be regularly cleaned. Residue buildup or contamination in equipment can transfer directly to the PCB during <strong data-start=\"1498\" data-end=\"1519\">\u0627\u0644\u0637\u0644\u0627\u0621 \u0627\u0644\u0645\u0637\u0627\u0628\u0642<\/strong>.<\/p>\n<p data-start=\"1522\" data-end=\"1763\"><strong data-start=\"1522\" data-end=\"1569\">Filter and store coating materials properly<\/strong><br data-start=\"1569\" data-end=\"1572\" \/>Coating materials should be stored in sealed containers and used within their shelf life. Filtering the coating before use helps remove particles that could cause defects in <a href=\"https:\/\/txjpcba.com\/ar\/%d8%aa%d8%ac%d9%85%d9%8a%d8%b9-%d8%ab%d9%86%d8%a7%d8%a6%d9%8a-%d8%a7%d9%84%d9%81%d9%8a%d9%86%d9%8a%d9%84-%d9%85%d8%aa%d8%b9%d8%af%d8%af-%d8%a7%d9%84%d9%83%d9%84%d9%88%d8%b1\/\"><strong data-start=\"1746\" data-end=\"1762\">\u062a\u062c\u0645\u064a\u0639 \u062b\u0646\u0627\u0626\u064a \u0627\u0644\u0641\u064a\u0646\u064a\u0644 \u0645\u062a\u0639\u062f\u062f \u0627\u0644\u0643\u0644\u0648\u0631<\/strong><\/a>.<\/p>\n<p data-start=\"1765\" data-end=\"1969\"><strong data-start=\"1765\" data-end=\"1794\">Control masking processes<\/strong><br data-start=\"1794\" data-end=\"1797\" \/>Improper masking can introduce contaminants such as adhesive residues. Use high-quality masking materials and ensure they are clean and compatible with the coating process.<\/p>\n<p data-start=\"1971\" data-end=\"2241\"><strong data-start=\"1971\" data-end=\"2003\">Avoid moisture contamination<\/strong><br data-start=\"2003\" data-end=\"2006\" \/>Moisture is a major source of defects. PCBs and components should be stored in dry conditions and, if necessary, baked before coating. In <a href=\"https:\/\/txjpcba.com\/ar\/%d8%ae%d8%af%d9%85%d8%a7%d8%aa-%d8%aa%d8%ac%d9%85%d9%8a%d8%b9-%d8%a7%d9%84%d8%b3%d9%85%d8%a8%d8%aa%d9%8a%d9%83\/\"><strong data-start=\"2144\" data-end=\"2160\">\u062a\u062c\u0645\u064a\u0639 SMT<\/strong><\/a>, moisture control is especially important for preventing outgassing and bubbles.<\/p>\n<p data-start=\"2243\" data-end=\"2469\"><strong data-start=\"2243\" data-end=\"2288\">Implement proper workflow and segregation<\/strong><br data-start=\"2288\" data-end=\"2291\" \/>Separate coating areas from soldering, machining, or other processes that generate dust and contaminants. A dedicated coating zone improves cleanliness in <strong data-start=\"2446\" data-end=\"2462\">\u062a\u062c\u0645\u064a\u0639 \u062b\u0646\u0627\u0626\u064a \u0627\u0644\u0641\u064a\u0646\u064a\u0644 \u0645\u062a\u0639\u062f\u062f \u0627\u0644\u0643\u0644\u0648\u0631<\/strong> lines.<\/p>\n<p data-start=\"2471\" data-end=\"2721\"><strong data-start=\"2471\" data-end=\"2518\">Perform inspection before and after coating<\/strong><br data-start=\"2518\" data-end=\"2521\" \/>Pre-coating inspection ensures the PCB is clean and ready. Post-coating inspection (often using UV light) helps detect contamination-related defects early in <strong data-start=\"2679\" data-end=\"2705\">\u062a\u062c\u0645\u064a\u0639 \u0627\u0644\u0646\u0645\u0648\u0630\u062c \u0627\u0644\u0623\u0648\u0644\u064a \u0644\u062b\u0646\u0627\u0626\u064a \u0627\u0644\u0641\u064a\u0646\u064a\u0644 \u0645\u062a\u0639\u062f\u062f \u0627\u0644\u0643\u0644\u0648\u0631<\/strong> and production.<\/p>\n<p data-start=\"2723\" data-end=\"2868\"><strong data-start=\"2723\" data-end=\"2759\">Train operators and enforce SOPs<\/strong><br data-start=\"2759\" data-end=\"2762\" \/>Well-trained personnel and standardized procedures reduce the risk of contamination caused by human error.<\/p>\n<p data-start=\"2870\" data-end=\"2911\"><strong data-start=\"2870\" data-end=\"2911\">Common contamination sources to avoid<\/strong><\/p>\n<ul data-start=\"2913\" data-end=\"3074\">\n<li data-section-id=\"1hiuqxa\" data-start=\"2913\" data-end=\"2952\">Flux residues and solder byproducts<\/li>\n<li data-section-id=\"5w0in0\" data-start=\"2953\" data-end=\"2984\">Dust and airborne particles<\/li>\n<li data-section-id=\"varcy1\" data-start=\"2985\" data-end=\"3010\">Oils and fingerprints<\/li>\n<li data-section-id=\"103dwlq\" data-start=\"3011\" data-end=\"3040\">Moisture and condensation<\/li>\n<li data-section-id=\"m8j7qx\" data-start=\"3041\" data-end=\"3074\">Dirty equipment or containers<\/li>\n<\/ul>\n<p data-start=\"3076\" data-end=\"3438\">In conclusion, avoiding contamination in <strong data-start=\"3117\" data-end=\"3138\">\u0627\u0644\u0637\u0644\u0627\u0621 \u0627\u0644\u0645\u0637\u0627\u0628\u0642<\/strong> requires strict control of <strong data-start=\"3166\" data-end=\"3227\">cleaning, environment, handling, materials, and equipment<\/strong>. By implementing these best practices in <strong data-start=\"3269\" data-end=\"3285\">\u062a\u062c\u0645\u064a\u0639 \u062b\u0646\u0627\u0626\u064a \u0627\u0644\u0641\u064a\u0646\u064a\u0644 \u0645\u062a\u0639\u062f\u062f \u0627\u0644\u0643\u0644\u0648\u0631<\/strong>, <strong data-start=\"3287\" data-end=\"3303\">\u062a\u062c\u0645\u064a\u0639 SMT<\/strong>, \u0648 <strong data-start=\"3309\" data-end=\"3335\">\u062a\u062c\u0645\u064a\u0639 \u0627\u0644\u0646\u0645\u0648\u0630\u062c \u0627\u0644\u0623\u0648\u0644\u064a \u0644\u062b\u0646\u0627\u0626\u064a \u0627\u0644\u0641\u064a\u0646\u064a\u0644 \u0645\u062a\u0639\u062f\u062f \u0627\u0644\u0643\u0644\u0648\u0631<\/strong>, manufacturers can significantly reduce defects and ensure high-quality, reliable coating performance.<\/p>\n<div style=\"background: #f8f8f8; border: 1px solid #e5e5e5; padding: 25px; margin-top: 30px; border-radius: 6px;\">\n<div style=\"text-align: center;\">\n<h3 style=\"margin-bottom: 10px; font-size: 22px;\">\u0627\u062d\u0635\u0644 \u0639\u0644\u0649 \u0639\u0631\u0636 \u0623\u0633\u0639\u0627\u0631 \u0627\u0644\u0637\u0644\u0627\u0621 \u0627\u0644\u0645\u0637\u0627\u0628\u0642<\/h3>\n<p style=\"font-size: 15px; color: #555; margin-bottom: 15px;\">\u0623\u0644\u0633\u062a \u0645\u062a\u0623\u0643\u062f\u064b\u0627 \u0645\u0646 \u0627\u0644\u0637\u0644\u0627\u0621 \u0627\u0644\u0645\u0637\u0627\u0628\u0642 \u0627\u0644\u0645\u0646\u0627\u0633\u0628 \u0644\u0645\u0646\u062a\u062c\u0643\u061f \u0627\u062a\u0635\u0644 \u0628\u062e\u0628\u0631\u0627\u0626\u0646\u0627 \u0627\u0644\u064a\u0648\u0645.<br \/>\n\u0623\u0631\u0633\u0644 \u0644\u0646\u0627 \u0645\u062a\u0637\u0644\u0628\u0627\u062a\u0643 \u0648\u0627\u062d\u0635\u0644 \u0639\u0644\u0649 \u0627\u0633\u062a\u062c\u0627\u0628\u0629 \u0633\u0631\u064a\u0639\u0629 \u0645\u0646 \u0641\u0631\u064a\u0642\u0646\u0627 \u0627\u0644\u0647\u0646\u062f\u0633\u064a.<\/p>\n<p style=\"font-size: 14px; color: #333; margin-bottom: 20px;\">\u2714 \u0627\u0633\u062a\u062c\u0627\u0628\u0629 \u0639\u0644\u0649 \u0645\u062f\u0627\u0631 24 \u0633\u0627\u0639\u0629 \u2714 \u062f\u0639\u0645 \u0647\u0646\u062f\u0633\u064a \u2714 \u062f\u0639\u0645 \u0647\u0646\u062f\u0633\u064a \u2714 \u0625\u0646\u062a\u0627\u062c \u0635\u063a\u064a\u0631 \u0648\u0636\u062e\u0645<\/p>\n<\/div>\n<div style=\"text-align: left;\"><style id=\"wpforms-css-vars-2237\">\n\t\t\t\t#wpforms-2237 {\n\t\t\t\t--wpforms-field-size-input-height: 43px;\n--wpforms-field-size-input-spacing: 15px;\n--wpforms-field-size-font-size: 16px;\n--wpforms-field-size-line-height: 19px;\n--wpforms-field-size-padding-h: 14px;\n--wpforms-field-size-checkbox-size: 16px;\n--wpforms-field-size-sublabel-spacing: 5px;\n--wpforms-field-size-icon-size: 1;\n--wpforms-label-size-font-size: 16px;\n--wpforms-label-size-line-height: 19px;\n--wpforms-label-size-sublabel-font-size: 14px;\n--wpforms-label-size-sublabel-line-height: 17px;\n--wpforms-button-size-font-size: 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class=\"wpforms-field-label\" for=\"wpforms-2237-field_1\">\u0627\u0644\u0628\u0631\u064a\u062f \u0627\u0644\u0625\u0644\u0643\u062a\u0631\u0648\u0646\u064a <span class=\"wpforms-required-label\" aria-hidden=\"true\">*<\/span><\/label><input type=\"email\" id=\"wpforms-2237-field_1\" class=\"wpforms-field-medium wpforms-field-required\" name=\"wpforms[fields][1]\" spellcheck=\"false\" aria-errormessage=\"wpforms-2237-field_1-error\" required><\/div><\/div><\/div><\/div><\/div>\t\t<div id=\"wpforms-2237-field_3-container\"\n\t\t\tclass=\"wpforms-field wpforms-field-text\"\n\t\t\tdata-field-type=\"text\"\n\t\t\tdata-field-id=\"3\"\n\t\t\t>\n\t\t\t<label class=\"wpforms-field-label\" for=\"wpforms-2237-field_3\" >Email Message Material<\/label>\n\t\t\t<input type=\"text\" id=\"wpforms-2237-field_3\" class=\"wpforms-field-medium\" name=\"wpforms[fields][3]\" >\n\t\t<\/div>\n\t\t<div id=\"wpforms-2237-field_11-container\" class=\"wpforms-field wpforms-field-text\" data-field-type=\"text\" 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connectors, test points).\" If you have specific coating material requirements (e.g., HumiSeal), Please indicate this in the comment box.<\/div><\/div><script>\n\t\t\t\t( function() {\n\t\t\t\t\tconst style = document.createElement( 'style' );\n\t\t\t\t\tstyle.appendChild( document.createTextNode( '#wpforms-2237-field_3-container { position: absolute !important; overflow: hidden !important; display: inline !important; height: 1px !important; width: 1px !important; z-index: -1000 !important; padding: 0 !important; } #wpforms-2237-field_3-container input { visibility: hidden; } #wpforms-conversational-form-page #wpforms-2237-field_3-container label { counter-increment: none; }' ) );\n\t\t\t\t\tdocument.head.appendChild( style );\n\t\t\t\t\tdocument.currentScript?.remove();\n\t\t\t\t} )();\n\t\t\t<\/script><\/div><!-- .wpforms-field-container --><div class=\"wpforms-submit-container\" ><input type=\"hidden\" name=\"wpforms[id]\" value=\"2237\"><input type=\"hidden\" name=\"page_title\" value=\"\"><input type=\"hidden\" name=\"page_url\" value=\"https:\/\/txjpcba.com\/ar\/wp-json\/wp\/v2\/posts\/5296\"><input type=\"hidden\" name=\"url_referer\" value=\"\"><button type=\"submit\" name=\"wpforms[submit]\" id=\"wpforms-submit-2237\" class=\"wpforms-submit\" aria-live=\"assertive\" value=\"wpforms-submit\">\u0625\u0631\u0633\u0627\u0644<\/button><img decoding=\"async\" src=\"https:\/\/txjpcba.com\/wp-content\/plugins\/wpforms\/assets\/images\/submit-spin.svg\" class=\"wpforms-submit-spinner\" style=\"display: none;\" width=\"26\" height=\"26\" alt=\"Loading\"><\/div><input type=\"hidden\" name=\"trp-form-language\" value=\"ar\"\/><\/form><\/div>  <!-- .wpforms-container --><\/div>\n<p style=\"font-size: 13px; color: #888; margin-top: 15px; text-align: center;\">\u0634\u0631\u0643\u0629 Shenzhen Tengxinjie Electronics Co., Ltd.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Avoid contamination during coating Contamination during Conformal Coating can lead to serious defects such as poor adhesion, bubbles, pinholes, and 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