{"id":6517,"date":"2026-04-24T10:10:39","date_gmt":"2026-04-24T10:10:39","guid":{"rendered":"https:\/\/www.sancofd.com\/"},"modified":"2026-04-28T06:37:57","modified_gmt":"2026-04-28T06:37:57","slug":"conformal-coating-process-explained-a-complete-guide-for-pcba-protection","status":"publish","type":"post","link":"https:\/\/www.sancofd.com\/ko\/conformal-coating-process-explained-a-complete-guide-for-pcba-protection\/","title":{"rendered":"Conformal Coating Process Explained: A Complete Guide for PCBA Protection"},"content":{"rendered":"<p><!-- Meta Description --><\/p>\n<p style=\"display:none;\">\nLearn the complete conformal coating process for PCBA protection, including coating methods, process flow, technical requirements, common coating defects, keep-out areas, coating material selection, and automatic selective coating equipment for electronics manufacturing.\n<\/p>\n<p><!-- Hero Image --><\/p>\n<figure style=\"margin:24px 0; text-align:center;\">\n  <img decoding=\"async\" src=\"https:\/\/www.sancofd.com\/wp-content\/uploads\/2026\/04\/conformal-coating-process-flow.png\" \n       alt=\"SANCO selective conformal coating process solution for PCBA protection\" \n       style=\"max-width:100%; height:auto; border-radius:8px;\"><figcaption style=\"font-size:14px; color:#666; margin-top:8px;\">\n    Selective conformal coating process solution for PCBA protection and automated electronics manufacturing.<br \/>\n  <\/figcaption><\/figure>\n<p>In modern electronics manufacturing, a printed circuit board assembly is not fully protected after soldering and assembly. Moisture, dust, salt spray, chemical contamination, temperature changes, and vibration can all affect the reliability and service life of electronic products.<\/p>\n<p>This is where the <strong>conformal coating process<\/strong> becomes essential. By applying a thin protective film onto the PCBA surface, conformal coating helps protect electronic circuits from harsh environments while maintaining electrical insulation and long-term reliability.<\/p>\n<p>For products used in <strong>automotive electronics, industrial control, home appliances, medical devices, renewable energy, communication equipment, LED electronics, and outdoor electronics<\/strong>, conformal coating is no longer an optional process. It has become a critical step for improving product reliability and reducing field failure risk.<\/p>\n<h2>1. What Is Conformal Coating?<\/h2>\n<p>Conformal coating is a specially formulated protective material applied to printed circuit boards. Common coating materials include acrylic, silicone, polyurethane, epoxy, and UV-curable coatings.<\/p>\n<p>After application and curing, the coating forms a transparent or semi-transparent protective film over the PCBA surface. This film helps protect the circuit board from moisture, dust, salt spray, mold, chemical corrosion, electrical leakage, and environmental stress.<\/p>\n<p>In practical PCBA manufacturing, conformal coating is often combined with an automatic <a href=\"https:\/\/www.sancofd.com\/three-axial-coating-machine\/\">Coating Machine<\/a>, precision <a href=\"https:\/\/www.sancofd.com\/g-300hp-high-pressure-valve\/\">Coating Valves<\/a>, inline <a href=\"https:\/\/www.sancofd.com\/uv-curing-oven\/\">Curing Oven<\/a>, and related <a href=\"https:\/\/www.sancofd.com\/conveyor\/\">Peripherals<\/a> to build a stable automated coating line.<\/p>\n<h2>2. Why Is Conformal Coating Important for PCBAs?<\/h2>\n<p>Electronic products are becoming smaller, denser, and more complex. At the same time, they are expected to operate reliably in more demanding environments. Without proper protection, PCBAs may suffer from corrosion, leakage current, short circuits, insulation failure, or premature component damage.<\/p>\n<p>A well-controlled conformal coating process helps manufacturers improve:<\/p>\n<ul>\n<li>Moisture and humidity resistance<\/li>\n<li>Salt spray and corrosion protection<\/li>\n<li>Electrical insulation performance<\/li>\n<li>Long-term product reliability<\/li>\n<li>Production consistency and quality control<\/li>\n<li>Failure risk reduction in harsh environments<\/li>\n<\/ul>\n<p>For automotive electronics, industrial control boards, power modules, communication equipment, and outdoor electronics, conformal coating is especially important because these products often face humidity, dust, temperature changes, and chemical exposure during long-term operation.<\/p>\n<h2>3. Main Conformal Coating Methods<\/h2>\n<p>There are several ways to apply conformal coating to a PCBA. The most common methods include brushing, dipping, manual spraying, and automatic selective spraying. Each method has different advantages and limitations.<\/p>\n<h3>3.1 Brushing<\/h3>\n<p>Brushing is one of the simplest coating methods. It is often used for repair, prototyping, or small-batch production. Operators apply the coating manually with a brush. This method has low equipment cost, but it depends heavily on operator skill and is not suitable for high-volume production.<\/p>\n<h3>3.2 Dipping<\/h3>\n<p>Dipping means immersing the entire circuit board into a coating tank. It can cover the board surface completely, but it is difficult to control local coating areas, coating thickness, and material consumption.<\/p>\n<h3>3.3 Manual Spraying<\/h3>\n<p>Manual spraying is more flexible than brushing and can be used for medium-volume production. However, coating consistency, overspray control, and edge accuracy still depend on operator experience.<\/p>\n<h3>3.4 Automatic Selective Spraying<\/h3>\n<p>Automatic selective conformal coating is currently one of the most effective methods for high-volume PCBA production. The machine applies coating only to required areas and avoids sensitive components such as connectors, switches, sockets, and test points.<\/p>\n<table style=\"width:100%; border-collapse:collapse; margin:24px 0;\" border=\"1\" cellpadding=\"8\">\n<thead>\n<tr>\n<th>Coating Method<\/th>\n<th>Suitable Application<\/th>\n<th>Main Advantage<\/th>\n<th>Limitation<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Brushing<\/td>\n<td>Repair, prototype, small batch<\/td>\n<td>Low cost and simple operation<\/td>\n<td>Low efficiency and poor consistency<\/td>\n<\/tr>\n<tr>\n<td>Dipping<\/td>\n<td>Full-board protection<\/td>\n<td>Complete coverage<\/td>\n<td>Difficult local control and high material waste<\/td>\n<\/tr>\n<tr>\n<td>Manual Spraying<\/td>\n<td>Medium-volume production<\/td>\n<td>Flexible operation<\/td>\n<td>Operator-dependent quality and overspray risk<\/td>\n<\/tr>\n<tr>\n<td>Selective Spraying<\/td>\n<td>High-volume PCBA production<\/td>\n<td>High precision, stable quality, less masking<\/td>\n<td>Requires automatic coating equipment investment<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>4. Standard Conformal Coating Process Flow<\/h2>\n<p>A reliable conformal coating process is not just about applying coating material. It includes cleaning, masking or selective protection, coating application, curing, inspection, and quality verification.<\/p>\n<table style=\"width:100%; border-collapse:collapse; margin:24px 0;\" border=\"1\" cellpadding=\"8\">\n<thead>\n<tr>\n<th>Process Step<\/th>\n<th>Main Purpose<\/th>\n<th>Key Control Points<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>PCBA Cleaning<\/td>\n<td>Remove flux residue, oil, dust, and contamination<\/td>\n<td>Surface cleanliness, drying time, residue control<\/td>\n<\/tr>\n<tr>\n<td>Pre-Baking<\/td>\n<td>Remove moisture from PCB and components<\/td>\n<td>Temperature, time, board material compatibility<\/td>\n<\/tr>\n<tr>\n<td>Masking \/ Selective Avoidance<\/td>\n<td>Protect areas that must not be coated<\/td>\n<td>Connectors, switches, sockets, test points, screw holes<\/td>\n<\/tr>\n<tr>\n<td>Coating Application<\/td>\n<td>Apply coating to required PCBA areas<\/td>\n<td>Valve type, coating path, speed, flow rate, spray width<\/td>\n<\/tr>\n<tr>\n<td>Curing<\/td>\n<td>Solidify the coating and form final protection<\/td>\n<td>UV intensity, oven temperature, curing time, conveyor speed<\/td>\n<\/tr>\n<tr>\n<td>Inspection<\/td>\n<td>Verify coating coverage and quality<\/td>\n<td>Visual inspection, UV check, thickness measurement<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>5. Key Parameters in Automatic Selective Coating<\/h2>\n<p>For automatic selective coating, process stability depends on both equipment performance and parameter control. A small change in valve height, pressure, material viscosity, or coating speed may affect the final coating result.<\/p>\n<p>The most important parameters include:<\/p>\n<ul>\n<li><strong>Coating path:<\/strong> Defines where the coating is applied and helps avoid restricted areas.<\/li>\n<li><strong>Valve type:<\/strong> Controls spray pattern, coating width, edge definition, and material output.<\/li>\n<li><strong>Coating speed:<\/strong> Affects coating thickness and surface uniformity.<\/li>\n<li><strong>Material flow rate:<\/strong> Controls coating volume and material consumption.<\/li>\n<li><strong>Atomization pressure:<\/strong> Influences spray stability and overspray control.<\/li>\n<li><strong>Valve height:<\/strong> Affects spray width, edge control, and coating accuracy.<\/li>\n<li><strong>Board positioning accuracy:<\/strong> Prevents coating offset and accidental coating of keep-out areas.<\/li>\n<\/ul>\n<p>For different materials and coating patterns, manufacturers may use different <a href=\"https:\/\/www.sancofd.com\/g-500hp-diaphragm-valve\/\">Coating Valves<\/a>, such as diaphragm valves, film spray valves, sector spray valves, striker valves, or conical spray valves.<\/p>\n<h2>6. Technical Requirements for Conformal Coating<\/h2>\n<p>To achieve stable coating quality, manufacturers need to control coating thickness, environmental conditions, material viscosity, curing conditions, and coating accuracy.<\/p>\n<p>Common technical requirements include uniform coating thickness, stable temperature and humidity, proper material viscosity, accurate keep-out control, and complete curing. If these factors are not controlled properly, defects such as bubbles, pinholes, whitening, dripping, uneven coating, or incomplete curing may occur.<\/p>\n<h2>7. Common Conformal Coating Defects and Causes<\/h2>\n<p>Even a small process error can lead to coating defects. Understanding common coating problems helps manufacturers improve process control and reduce product failure risks.<\/p>\n<table style=\"width:100%; border-collapse:collapse; margin:24px 0;\" border=\"1\" cellpadding=\"8\">\n<thead>\n<tr>\n<th>Defect<\/th>\n<th>Possible Cause<\/th>\n<th>Recommended Solution<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Bubbles<\/td>\n<td>Moisture, contamination, trapped air, excessive coating speed<\/td>\n<td>Improve cleaning and drying, adjust spray parameters, control humidity<\/td>\n<\/tr>\n<tr>\n<td>Pinholes<\/td>\n<td>Surface contamination, poor wetting, improper viscosity<\/td>\n<td>Clean PCBA surface, optimize material viscosity, adjust coating method<\/td>\n<\/tr>\n<tr>\n<td>Uneven Coating<\/td>\n<td>Unstable spray pattern, incorrect valve height, inconsistent speed<\/td>\n<td>Optimize valve height, coating speed, pressure, and spray width<\/td>\n<\/tr>\n<tr>\n<td>Whitening \/ Cloudy Film<\/td>\n<td>High humidity, moisture absorption, unsuitable curing condition<\/td>\n<td>Control environment humidity, pre-bake PCBAs, verify curing process<\/td>\n<\/tr>\n<tr>\n<td>Dripping \/ Flow Marks<\/td>\n<td>Excessive coating volume, low viscosity, slow movement speed<\/td>\n<td>Reduce flow rate, adjust viscosity, optimize coating path<\/td>\n<\/tr>\n<tr>\n<td>Overspray<\/td>\n<td>Improper nozzle angle, excessive atomization pressure, poor path control<\/td>\n<td>Use selective coating path, adjust atomization, improve fixture positioning<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>8. Areas That Should Not Be Coated<\/h2>\n<p>Although conformal coating protects most of the PCBA surface, some components must remain uncoated. If these areas are coated, it may affect electrical connection, mechanical assembly, optical performance, heat dissipation, or future maintenance.<\/p>\n<p>Typical keep-out areas include connectors, sockets, switches, potentiometers, test points, screw holes, heat sinks, LEDs, optical components, and some low-clearance BGA or QFN areas. These areas can be protected by selective coating path control, masking caps, tape, fixtures, or local no-coating zone programming.<\/p>\n<h2>9. How to Choose the Right Conformal Coating Material<\/h2>\n<p>The coating material should be selected according to the product environment, reliability requirement, production process, and curing method. There is no single coating material suitable for every application.<\/p>\n<p>Common coating materials include acrylic, silicone, polyurethane, epoxy, and UV-curable coatings. Acrylic coatings are easy to apply and rework. Silicone coatings are suitable for flexible and high-temperature applications. Polyurethane coatings provide stronger chemical resistance. Epoxy coatings offer high hardness and strong protection. UV-curable coatings are suitable for high-speed automated coating lines.<\/p>\n<h2>10. Curing Methods in Conformal Coating<\/h2>\n<p>Curing is a key part of the conformal coating process. Different coating materials require different curing methods. The correct curing process helps ensure coating adhesion, hardness, chemical resistance, and electrical protection.<\/p>\n<p>Common curing methods include room-temperature curing, heat curing, UV curing, moisture curing, and dual curing. For inline automation, manufacturers often use a <a href=\"https:\/\/www.sancofd.com\/uv-curing-oven\/\">UV Curing Oven<\/a>, <a href=\"https:\/\/www.sancofd.com\/ir-curing-oven\/\">IR Curing Oven<\/a>, <a href=\"https:\/\/www.sancofd.com\/hot-wind-curing-oven\/\">Hot Wind Curing Oven<\/a>, or <a href=\"https:\/\/www.sancofd.com\/uv-led-curing-oven\/\">UV LED Curing Oven<\/a> depending on the coating material and production speed.<\/p>\n<h2>11. Why Automatic Selective Coating Equipment Is Becoming More Important<\/h2>\n<p>As electronic products become more complex, manual coating methods are no longer enough for many manufacturers. Manual processes can create inconsistent coating thickness, excessive material waste, unstable quality, and high labor cost.<\/p>\n<p>Automatic selective conformal coating equipment helps manufacturers achieve higher coating accuracy, better repeatability, reduced manual masking, lower material waste, stable coating thickness, and better integration with inline production.<\/p>\n<p>A complete automated solution may include a <a href=\"https:\/\/www.sancofd.com\/four-axial-coating-machine\/\">Four-Axis Coating Machine<\/a>, <a href=\"https:\/\/www.sancofd.com\/uv-conveyor\/\">UV Conveyor<\/a>, curing oven, inspection system, loader, unloader, and NG\/OK sorting conveyor.<\/p>\n<h2>12. Inline Conformal Coating Line for PCBA Manufacturing<\/h2>\n<p>A complete conformal coating solution can include more than one machine. In many production lines, the coating process is integrated with handling, curing, inspection, and unloading systems.<\/p>\n<p>A typical inline conformal coating line may include an automatic <a href=\"https:\/\/www.sancofd.com\/loadder\/\">Magazine Loader<\/a>, <a href=\"https:\/\/www.sancofd.com\/conveyor\/\">Conveyor<\/a>, selective coating machine, <a href=\"https:\/\/www.sancofd.com\/ir-curing-oven\/\">IR Curing Oven<\/a> or <a href=\"https:\/\/www.sancofd.com\/uv-curing-oven\/\">UV Curing Oven<\/a>, AOI inspection, <a href=\"https:\/\/www.sancofd.com\/ng-ok-conveyor\/\">NG \/ OK Conveyor<\/a>, and <a href=\"https:\/\/www.sancofd.com\/unloadder\/\">Magazine Unloader<\/a>.<\/p>\n<p>For more complex lines, manufacturers may also use <a href=\"https:\/\/www.sancofd.com\/elevator\/\">Elevators<\/a>, <a href=\"https:\/\/www.sancofd.com\/pcb-flipper\/\">PCB Flippers<\/a>, <a href=\"https:\/\/www.sancofd.com\/shuttle-conveyor\/\">Shuttle Conveyors<\/a>, <a href=\"https:\/\/www.sancofd.com\/vertical-bufferconveyor\/\">Vertical Buffer Conveyors<\/a>, and <a href=\"https:\/\/www.sancofd.com\/vertical-cooling-buffer-conveyor\/\">Vertical Cooling Buffer Conveyors<\/a> to improve automation and production continuity.<\/p>\n<h2>13. SANCO Conformal Coating and Dispensing Solutions<\/h2>\n<p>SANCO provides automated equipment and process solutions for PCBA conformal coating, dispensing, potting, curing, and production line integration.<\/p>\n<p>Our solutions cover <a href=\"https:\/\/www.sancofd.com\/high-speed-dispenser\/\">Dispensing Machine<\/a>, <a href=\"https:\/\/www.sancofd.com\/piezo-valve-1\/\">Dispensing Valves<\/a>, <a href=\"https:\/\/www.sancofd.com\/three-axial-coating-machine\/\">Coating Machine<\/a>, <a href=\"https:\/\/www.sancofd.com\/g-300hp-high-pressure-valve\/\">Coating Valves<\/a>, <a href=\"https:\/\/www.sancofd.com\/inline-potting-machine\/\">Potting Machine<\/a>, <a href=\"https:\/\/www.sancofd.com\/uv-curing-oven\/\">Curing Oven<\/a>, and inline automation peripherals.<\/p>\n<table style=\"width:100%; border-collapse:collapse; margin:24px 0;\" border=\"1\" cellpadding=\"8\">\n<thead>\n<tr>\n<th>SANCO Solution<\/th>\n<th>Application<\/th>\n<th>Recommended Link<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Three-Axis Conformal Coating Machine<\/td>\n<td>Standard selective coating process for PCBA production<\/td>\n<td><a href=\"https:\/\/www.sancofd.com\/three-axial-coating-machine\/\">View Product<\/a><\/td>\n<\/tr>\n<tr>\n<td>Four-Axis Conformal Coating Machine<\/td>\n<td>Flexible coating angle and complex PCBA applications<\/td>\n<td><a href=\"https:\/\/www.sancofd.com\/four-axial-coating-machine\/\">View Product<\/a><\/td>\n<\/tr>\n<tr>\n<td>Desktop Coating Machine<\/td>\n<td>Small batch, laboratory, prototype, and flexible production<\/td>\n<td><a href=\"https:\/\/www.sancofd.com\/desktop-coating-machine\/\">View Product<\/a><\/td>\n<\/tr>\n<tr>\n<td>Inline PCBA Conformal Coating Line<\/td>\n<td>Automated coating, curing, inspection, and handling line<\/td>\n<td><a href=\"https:\/\/www.sancofd.com\/online-pcba-conformal-coating-line-with-return-plate\/\">View Solution<\/a><\/td>\n<\/tr>\n<tr>\n<td>Dispensing and Potting Automation<\/td>\n<td>Glue dispensing, sealing, potting, and fluid control applications<\/td>\n<td><a href=\"https:\/\/www.sancofd.com\/ds-series-linlinehigh-speeddispensing-machine\/\">View Dispensing Machine<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>14. Related SANCO Equipment Links<\/h2>\n<p>For different electronics manufacturing processes, you can also explore the following SANCO equipment categories:<\/p>\n<h3>Dispensing Machine<\/h3>\n<ul>\n<li><a href=\"https:\/\/www.sancofd.com\/high-speed-dispenser\/\">High Speed Dispenser<\/a><\/li>\n<li><a href=\"https:\/\/www.sancofd.com\/ds-series-linlinehigh-speeddispensing-machine\/\">DS Series Inline High-Speed Dispensing Machine<\/a><\/li>\n<li><a href=\"https:\/\/www.sancofd.com\/offline-high-speed-dispensing-machine\/\">Offline High-Speed Dispensing Machine<\/a><\/li>\n<li><a href=\"https:\/\/www.sancofd.com\/desktop-visual\/\">Desktop Visual Dispensing Machine<\/a><\/li>\n<li><a href=\"https:\/\/www.sancofd.com\/canp-5g-pump\/\">CANP 5G Pump<\/a><\/li>\n<\/ul>\n<h3>Dispensing Valves<\/h3>\n<ul>\n<li><a href=\"https:\/\/www.sancofd.com\/piezo-valve-1\/\">Piezo Valve<\/a><\/li>\n<li><a href=\"https:\/\/www.sancofd.com\/piezo-valve-2\/\">Piezo Jet Valve<\/a><\/li>\n<li><a href=\"https:\/\/www.sancofd.com\/piezo-valve-controller\/\">Piezo Valve Controller<\/a><\/li>\n<li><a href=\"https:\/\/www.sancofd.com\/single-liquid\/\">Single Liquid Valve<\/a><\/li>\n<li><a href=\"https:\/\/www.sancofd.com\/dual-liquid-screw-valve\/\">Dual Liquid Screw Valve<\/a><\/li>\n<\/ul>\n<h3>Coating Valves<\/h3>\n<ul>\n<li><a href=\"https:\/\/www.sancofd.com\/g-300hp-high-pressure-valve\/\">G-300HP High Pressure Valve<\/a><\/li>\n<li><a href=\"https:\/\/www.sancofd.com\/g-500hp-diaphragm-valve\/\">G-500HP Diaphragm Valve<\/a><\/li>\n<li><a href=\"https:\/\/www.sancofd.com\/bf-028-film-spray-valve\/\">BF-028 Film Spray Valve<\/a><\/li>\n<li><a href=\"https:\/\/www.sancofd.com\/sf-073-sector-spray-valve\/\">SF-073 Sector Spray Valve<\/a><\/li>\n<li><a href=\"https:\/\/www.sancofd.com\/g-420a-precision-striker-valve\/\">G-420A Precision Striker Valve<\/a><\/li>\n<li><a href=\"https:\/\/www.sancofd.com\/lf-001-conical-spray-valve\/\">LF-001 Conical Spray Valve<\/a><\/li>\n<\/ul>\n<h3>Potting Machine and Curing Oven<\/h3>\n<ul>\n<li><a href=\"https:\/\/www.sancofd.com\/inline-potting-machine\/\">Inline Potting Machine<\/a><\/li>\n<li><a href=\"https:\/\/www.sancofd.com\/offline-potting-machine\/\">Offline Potting Machine<\/a><\/li>\n<li><a href=\"https:\/\/www.sancofd.com\/ir-curing-oven\/\">IR Curing Oven<\/a><\/li>\n<li><a href=\"https:\/\/www.sancofd.com\/uv-curing-oven\/\">UV Curing Oven<\/a><\/li>\n<li><a href=\"https:\/\/www.sancofd.com\/hot-wind-curing-oven\/\">Hot Wind Curing Oven<\/a><\/li>\n<li><a href=\"https:\/\/www.sancofd.com\/uv-led-curing-oven\/\">UV LED Curing Oven<\/a><\/li>\n<li><a href=\"https:\/\/www.sancofd.com\/vertical-oven\/\">Vertical Oven<\/a><\/li>\n<li><a href=\"https:\/\/www.sancofd.com\/lead-free-hot-air-reflow-ovens\/\">Lead-Free Hot Air Reflow Ovens<\/a><\/li>\n<\/ul>\n<h2>15. Typical Industries Using Conformal Coating<\/h2>\n<p>Conformal coating is widely used in automotive electronics, industrial control, new energy electronics, home appliances, medical electronics, communication equipment, LED electronics, outdoor electronics, and power electronics.<\/p>\n<p>These industries often require long-term PCBA protection against moisture, dust, salt spray, corrosion, vibration, and temperature changes. By using automatic selective coating equipment, manufacturers can improve coating consistency, reduce manual errors, and build a more stable production process.<\/p>\n<h2>Conclusion<\/h2>\n<p>The <strong>conformal coating process<\/strong> plays a critical role in protecting PCBAs from moisture, dust, salt spray, corrosion, and electrical failure. A successful coating process requires more than choosing the right coating material. It also depends on proper cleaning, accurate coating, controlled curing, inspection, and keep-out area management.<\/p>\n<p>For modern electronics manufacturing, automatic selective conformal coating equipment is becoming the preferred solution because it provides higher precision, better consistency, lower material waste, and stronger production efficiency.<\/p>\n<p>If your production requires reliable PCBA protection, SANCO can provide <a href=\"https:\/\/www.sancofd.com\/three-axial-coating-machine\/\">conformal coating machines<\/a>, <a href=\"https:\/\/www.sancofd.com\/uv-curing-oven\/\">curing systems<\/a>, <a href=\"https:\/\/www.sancofd.com\/high-speed-dispenser\/\">dispensing machines<\/a>, <a href=\"https:\/\/www.sancofd.com\/inline-potting-machine\/\">potting machines<\/a>, and complete inline automation solutions based on your process requirements.<\/p>\n<p><!-- Equipment Image --><\/p>\n<figure style=\"margin:24px 0; text-align:center;\">\n  <img decoding=\"async\" src=\"https:\/\/www.sancofd.com\/wp-content\/uploads\/2026\/04\/factory.png\" \n       alt=\"SANCO automatic selective conformal coating line for PCBA manufacturing\" \n       style=\"max-width:100%; height:auto; border-radius:8px;\"><figcaption style=\"font-size:14px; color:#666; margin-top:8px;\">\n    SANCO automatic selective conformal coating line for PCBA manufacturing and process integration.<br \/>\n  <\/figcaption><\/figure>\n<h2>FAQ<\/h2>\n<h3>What is the purpose of conformal coating?<\/h3>\n<p>The purpose of conformal coating is to protect PCBAs from moisture, dust, corrosion, salt spray, chemical contamination, and electrical leakage. It helps improve product reliability and service life.<\/p>\n<h3>Which conformal coating method is best for mass production?<\/h3>\n<p>For mass production, automatic selective conformal coating is usually the best choice. It provides higher accuracy, better consistency, reduced masking work, and improved production efficiency.<\/p>\n<h3>What areas should not be coated on a PCBA?<\/h3>\n<p>Connectors, switches, sockets, test points, screw holes, heat sinks, LEDs, optical components, and some high-power components should usually not be coated.<\/p>\n<h3>Why does conformal coating produce bubbles?<\/h3>\n<p>Bubbles may be caused by moisture, surface contamination, trapped air, high humidity, incorrect coating speed, or improper curing conditions.<\/p>\n<h3>Can SANCO provide a complete conformal coating line?<\/h3>\n<p>Yes. SANCO can provide single conformal coating machines as well as complete inline coating solutions including coating, curing, inspection, conveyors, loaders, and unloaders.<\/p>\n<p><!-- FAQ Schema --><br \/>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the purpose of conformal coating?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The purpose of conformal coating is to protect PCBAs from moisture, dust, corrosion, salt spray, chemical contamination, and electrical leakage. It helps improve product reliability and service life.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which conformal coating method is best for mass production?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For mass production, automatic selective conformal coating is usually the best choice. It provides higher accuracy, better consistency, reduced masking work, and improved production efficiency.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What areas should not be coated on a PCBA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Connectors, switches, sockets, test points, screw holes, heat sinks, LEDs, optical components, and some high-power components should usually not be coated.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why does conformal coating produce bubbles?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bubbles may be caused by moisture, surface contamination, trapped air, high humidity, incorrect coating speed, or improper curing conditions.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can SANCO provide a complete conformal coating line?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. SANCO can provide single conformal coating machines as well as complete inline coating solutions including coating, curing, inspection, conveyors, loaders, and unloaders.\"\n      }\n    }\n  ]\n}\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Learn the complete conformal coating process for PCBA protection, including coating methods, process flow, technical requirements, common coating defects, keep-out areas, coating material selection, and automatic selective coating equipment for electronics manufacturing. Selective conformal coating process solution for PCBA protection and automated electronics manufacturing. In modern electronics manufacturing, a printed circuit board assembly is not [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":6518,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[98,40,101,99,28,25,100,71,31,83],"class_list":["post-6517","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-automatic-coating-equipment","tag-coating-defects","tag-coating-methods","tag-coating-process-flow","tag-conformal-coating","tag-electronics-manufacturing","tag-electronics-reliability","tag-pcb-assembly","tag-pcb-coating","tag-pcba-protection"],"_links":{"self":[{"href":"https:\/\/www.sancofd.com\/ko\/wp-json\/wp\/v2\/posts\/6517","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sancofd.com\/ko\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.sancofd.com\/ko\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.sancofd.com\/ko\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sancofd.com\/ko\/wp-json\/wp\/v2\/comments?post=6517"}],"version-history":[{"count":2,"href":"https:\/\/www.sancofd.com\/ko\/wp-json\/wp\/v2\/posts\/6517\/revisions"}],"predecessor-version":[{"id":6524,"href":"https:\/\/www.sancofd.com\/ko\/wp-json\/wp\/v2\/posts\/6517\/revisions\/6524"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.sancofd.com\/ko\/wp-json\/wp\/v2\/media\/6518"}],"wp:attachment":[{"href":"https:\/\/www.sancofd.com\/ko\/wp-json\/wp\/v2\/media?parent=6517"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sancofd.com\/ko\/wp-json\/wp\/v2\/categories?post=6517"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sancofd.com\/ko\/wp-json\/wp\/v2\/tags?post=6517"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}