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5 6</head><body><a class="skip" href="#main">Skip to content</a> 7<div class="topbar"><div class="wrap"><span>PCB backup-board specialist · Foshan, China</span><span>WhatsApp: <a href="https://wa.me/8613433290964">+86 13433290964</a> · <a href="/cdn-cgi/l/email-protection#d5bdb0bbb4bb8aada095bdbaa1b8b4bcb9fbb6bab8"><span class="__cf_email__" data-cfemail="157d707b747b4a6d60557d7a6178747c793b767a78">[email protected]</span></a></span></div></div> 8<header class="header"><div class="wrap nav"><a class="logo" href="/"><img alt="YUESHAN PCB backup board manufacturer" height="50" src="/images/logo.png" width="152"/></a><nav aria-label="Primary" class="navlinks"><a href="/products/">Backup Boards</a><a href="/resources/choose-backup-board/">Selection Guide</a><a href="/resources/exit-burr-control/">Exit Burr</a><a href="/#quality">Quality</a><a href="/#factory">Factory</a><a class="cta" href="/#rfq">Request Sample</a></nav></div></header><main id="main"> 9<section class="hero inner"><div class="wrap"><div class="breadcrumb"><a href="/">Home</a> / <a href="/products/">PCB Backup Boards</a> / HDF PCB Backup Board â 840 / 880 / 950 Grades</div><div class="eyebrow">Cost-performance baseline</div><h1>HDF PCB Backup Board â 840 / 880 / 950 Grades</h1><p class="lead">Commercial product page for specifications, qualification, samples and RFQ. Final purchasing limits should follow the current TDS and your line-test result.</p><div class="actions"><a class="btn primary" href="/cdn-cgi/l/email-protection#523a373c333c0d2a27123a3d263f333b3e7c313d3f6d212730383731266f1a1614776062021110776062103331392722776062103d332036776062b0d2c67760626a66627760627d7760626a6a627760627d7760626b676277606215203336372177606206160177606201333f223e37">Request TDS & Sample</a><a class="btn secondary" href="/products/">Compare All Backup Boards</a></div></div></section> 10<section class="section tight"><div class="wrap"><div class="geo"><strong>Direct answer:</strong> YUESHAN HDF PCB backup boards are high-density fibreboard support sheets for standard mechanical drilling. Current indexed product information lists 840/880/950 kg/m³ density classes, 70 HD class, â¤0.10 mm flatness and typical 2.0/2.5 mm thickness. HDF should be qualified by density consistency, flatness, moisture behavior, exit burr, drill wear and lot repeatability â not by density number alone.</div><div class="toc"><strong>On this page:</strong> <a href="#specs">Specifications</a><a href="#fit">Where it fits</a><a href="#control">What it controls</a><a href="#qualify">Qualification</a><a href="#faq">FAQ</a></div></div></section> 11<section class="section" id="specs"><div class="wrap"><div class="media"><div><h2>Commercial specification starting point</h2><p class="intro">These values are presented as current/published website starting data. Treat the current TDS for the quoted lot/grade as the controlling technical document.</p><div class="tablewrap"><table class="data"><tbody><tr><td><strong>Material</strong></td><td>High Density Fiberboard (HDF)</td></tr><tr><td><strong>Density grades</strong></td><td>840 / 880 / 950 kg/m³ class (current indexed product data)</td></tr><tr><td><strong>Hardness</strong></td><td>70 HD class (current indexed product data)</td></tr><tr><td><strong>Typical thickness</strong></td><td>2.0 / 2.5 mm</td></tr><tr><td><strong>Flatness</strong></td><td>â¤0.10 mm (current indexed product data)</td></tr><tr><td><strong>Typical role</strong></td><td>Standard multilayer / cost-sensitive PCB drilling</td></tr></tbody></table></div></div><div><img alt="HDF PCB Backup Board â 840 / 880 / 950 Grades supplied by YUESHAN" class="product-img" loading="eager" src="/images/material-05.jpg"/></div></div></div></section> 12<section class="section soft" id="fit"><div class="wrap"><h2>Where this backup board fits</h2><div class="grid g3"><div class="card"><h3>Standard multilayer</h3><p>Use HDF as the baseline when the line is stable and cost is a primary driver.</p></div><div class="card"><h3>Controlled environment</h3><p>HDF is easiest to manage when storage and factory humidity are stable.</p></div><div class="card"><h3>Known drill window</h3><p>Good fit when hole sizes, stack and hit count are already mature and repeatable.</p></div></div><div class="warning" style="margin-top:22px"><strong>Do not over-specify:</strong><ul class="checklist"><li><strong>
12High humidity / recurring warpage:</strong> Test a sealed-face UV melamine grade if bare HDF is losing flatness.</li><li><strong>Tighter HDI / smear-limited work:</strong> A sealed surface may be worth qualifying when wall cleanliness becomes the bottleneck.</li><li><strong>Buying by density only:</strong> Higher density is not automatically lower cost per good hole; verify bit wear and yield.</li></ul></div></div></section> 13<section class="section" id="control"><div class="wrap"><h2>What buyers should measure â not just what the datasheet says</h2><div class="grid g3"><div class="card"><h3>Exit support</h3><p>Measure bottom-side burr/tear-out and hole quality on the actual panel stack.</p></div><div class="card"><h3>Tool interaction</h3><p>Track bit wear, breakage, hit count and any change in resharpening frequency.</p></div><div class="card"><h3>Stack stability</h3><p>Check flatness, vacuum behavior, compression and any hole-location or depth instability.</p></div><div class="card"><h3>Hole-wall cleanliness</h3><p>Inspect smear, debris transfer and downstream desmear/plating burden.</p></div><div class="card"><h3>Moisture behavior</h3><p>Evaluate after real storage and transit, especially for fibre-based materials.</p></div><div class="card"><h3>Total cost</h3><p>Convert sheet cost, drill consumption, scrap and downtime into cost per good panel or good hole.</p></div></div></div></section><section class="section soft"><div class="wrap"><div class="kicker">Low-cost HDF qualification</div><h2>High density does not automatically mean low drill cost</h2><p class="intro">HDF is often the economical baseline. The risk is buying by kg/m³ alone. Two boards with similar density can behave differently because the density profile, fibre/resin system, internal bond, moisture and added mineral/filler content can differ.</p><div class="grid g3"><div class="card"><h3>Ask what makes the board dense</h3><p>Request density tolerance plus internal-bond / composition information where available. Do not assume a heavy board is automatically a more uniform drilling support.</p></div><div class="card"><h3>Measure âbit killerâ complaints</h3><p>If operators report fast dulling, compare hits per bit, drill temperature/residue, resharpening interval and breakage. Tool wear is a production KPI, not something density alone predicts.</p></div><div class="card"><h3>Check moisture after opening</h3><p>Fibreboard is hygroscopic. Record flatness before and after storage/conditioning, especially if the complaint is cupping, bowing or vacuum leakage.</p></div></div><div class="warning" style="margin-top:22px"><strong>Procurement note:</strong> If any supplier claims â100% eucalyptus,â âzero filler,â or a specific filler percentage, request a raw-material declaration or test evidence. Those claims should not be inferred from board weight, color or hardness alone.</div></div></section> 14<section class="section soft"><section class="section alt"><div class="wrap"> 15<div class="kicker">Cheap-HDF trap</div> 16<h2>High filler, mixed fibre and âfurniture-boardâ HDF: what to check</h2> 17<p class="intro">A board can hit a target density in more than one way. For PCB drilling, the buyer should care about <strong>how that density is built</strong> and how it affects drill wear, exit support and lot-to-lot consistency.</p> 18<div class="tablewrap"><table class="data"><thead><tr><th>Shop-floor phrase</th><th>Possible concern</th><th>What to verify</th></tr></thead><tbody> 19<tr><td><strong>âStone-dust boardâ / âbit killerâ</strong></td><td>High mineral/filler content may increase abrasiveness.</td><td>Hits per drill, wear land, drill temperature/residue, composition declaration where available.</td></tr> 20<tr><td><strong>âSoft-core HDFâ / âfurniture boardâ</strong></td><td>Weak or uneven density profile can reduce support at breakthrough.</td><td>Cross-section, internal bond, density profile, exit burr and drill grabbing.</td></tr> 21<tr><td><strong>âHeavy board = good boardâ</strong></td><td>Weight alone can hide filler or moisture differences.</td><td>Conditioned density, moisture, hardness, drilling output.</td></tr> 22<tr><td><strong>âBlack-line edgeâ</strong></td><td>May indicate a different resin/fibre/process history, but is not a chemical test.</td><td>SDS/TDS, resin declaration, emissions requirement, heat/residue behavior.</td></tr> 23</tbody></table></div> 24<div class="note"><strong>Commercial counter:</strong> if another HDF is $0.80â$1.00 cheaper per sheet, compare the weekly drill-bit budget and first-pass yield before calling it cheaper.</div> 25</div></section><div class="wrap"><h2>Compare with other YUESHAN backup-board families</h2><div class="tablewrap"><table class="data"><thead><tr><th>
25Alternative</th><th>When to consider it</th><th>Page</th></tr></thead><tbody><tr><td>HDF</td><td>Standard multilayer and cost-first qualification</td><td><a href="/products/hdf-backup-board/">HDF PCB Backup Board â</a></td></tr><tr><td>Melamine laminate</td><td>Hard fused surface with HDF core; FPC / rigid-flex / multilayer</td><td><a href="/products/melamine-backup-board/">Melamine Backup Board â</a></td></tr><tr><td>UV Melamine</td><td>Sealed surface where humidity, smear or HDI tolerance matters</td><td><a href="/products/uv-melamine-backup-board/">UV Melamine â</a></td></tr><tr><td>Phenolic PHE</td><td>Specialty high-hardness support for selected precision work</td><td><a href="/products/phenolic-backup-board/">Phenolic PHE â</a></td></tr></tbody></table></div></div></section> 26<section class="section" id="qualify"><div class="wrap"><h2>Buyer qualification checklist</h2><div class="grid g2"><div class="card"><h3>Send with the RFQ</h3><ul class="checklist"><li>Current backup-board type and specification</li><li>PCB thickness, layer count and laminate family</li><li>Smallest mechanical drill diameter and hit count</li><li>Panels per stack and target throughput</li><li>Current exit burr / breakage / smear / warpage problem</li><li>Sheet size, thickness, volume and destination</li></ul></div><div class="card"><h3>Measure in the side-by-side</h3><ul class="checklist"><li>Exit burr / tear-out</li><li>Hole position and wall cleanliness</li><li>Bit wear and breakage</li><li>Flatness / stack stability</li><li>First-pass yield and scrap</li><li>Cost per good drilled panel</li></ul></div></div><p class="note">Selection help: <a href="/resources/choose-backup-board/">How to Choose the Right PCB Backup Board</a> · Troubleshooting: <a href="/resources/exit-burr-control/">PCB Drilling Exit Burr Control</a></p></div></section> 27<section class="section soft"><div class="wrap"><h2>Drill-room troubleshooting library</h2><p class="intro">Use these problem-led pages to move from shop-floor complaints to controlled qualification tests.</p><div class="grid g3"><a class="card linkcard" href="/resources/drill-bit-breakage/"><div class="kicker">Breakage</div><h3>Drill Bit Breakage</h3><p>Snatching, grabbing, breakthrough snap and tool-life diagnosis.</p></a><a class="card linkcard" href="/resources/uv-warpage-after-cutting/"><div class="kicker">Flatness</div><h3>UV Warpage After Cutting</h3><p>Banana board, cupping, bowing, moisture and cure/conditioning checks.</p></a><a class="card linkcard" href="/resources/cheap-pcb-backup-board-trap/"><div class="kicker">Procurement</div><h3>The $1/Sheet Trap</h3><p>Compare cost per good panel instead of board price alone.</p></a><a class="card linkcard" href="/resources/pf-vs-uf-resin/"><div class="kicker">Materials</div><h3>PF vs UF Resin</h3><p>Glue recipe, thermal claims, moisture and supplier verification.</p></a><a class="card linkcard" href="/resources/resin-gunk-drill-wrap/"><div class="kicker">Residue</div><h3>Resin Gunk & Drill Wrap</h3><p>Sticky residue, tool heat, resin wrap and one-variable testing.</p></a><a class="card linkcard" href="/resources/exit-burr-control/"><div class="kicker">Exit quality</div><h3>Exit Burr Control</h3><p>Bottom blowout, copper pull and backup-support troubleshooting.</p></a></div></div></section><section class="section soft" id="faq"><div class="wrap"><h2>HDF PCB Backup Board â 840 / 880 / 950 Grades FAQ</h2><div class="faq"><details><summary>What is an HDF PCB backup board?</summary><p>It is a high-density fibreboard sheet placed under the PCB stack during mechanical drilling to provide controlled exit support.</p></details><details><summary>What HDF grades does YUESHAN list?</summary><p>Current indexed YUESHAN product information lists 840, 880 and 950 kg/m³ density classes. Confirm the exact current grade, tolerance and test method in the TDS before approval.</p></details><details><summary>When should I use HDF instead of UV melamine?</summary><p>Use HDF as the cost baseline for stable standard drilling. Consider UV melamine when humidity, surface cleanliness or tighter multilayer/HDI tolerance becomes the limiting variable.</p></details>
27<details><summary>What should incoming inspection check?</summary><p>At minimum, verify the agreed thickness, flatness, density/grade identification, sheet condition and packaging; add any plant-specific burr or moisture checks defined during qualification.</p></details><details><summary>Can HDF cause drill-bit snapping?</summary><p>A backup board can contribute if it is warped, poorly supported or inconsistent, but snapping can also come from vacuum, tool condition, entry material, stack and drilling parameters. Diagnose the system, not one variable.</p></details><details><summary>Can I get a line-test sample?</summary><p>Yes. Send current backup specification, PCB layer count, smallest hole, stack, defect target, sheet size and volume so the sample is relevant.</p></details><details><summary>Can a high-density HDF backup board wear drills faster?</summary><p>It can, but density alone does not determine tool wear. Fibre/resin composition, mineral or filler content, hardness, drill geometry and parameters all affect machinability. Compare hits per bit and breakage under the same drilling conditions.</p></details><details><summary>Does a heavier HDF board prove it is better quality?</summary><p>No. Weight or density should be reviewed with flatness, internal consistency, moisture behavior, surface condition, exit burr and tool-life results. A side-by-side line test is more useful than density alone.</p></details><details><summary>Can a very high-density HDF wear PCB drill bits faster?</summary><p>It can if the higher density comes with a more abrasive composition or an unsuitable density profile. Do not judge by kg/m³ alone; compare hits per bit, wear, residue, breakage and cost per good panel.</p></details></div></div></section> 28<section class="section sourcebar"><div class="wrap"><h2>Technical references used for this buyer-focused framework</h2><ul class="source-list"><li><a href="https://www.schmoll-maschinen.de/news/people-in-precision-april-the-foundation-of-stacking-pinning" rel="noopener" target="_blank">Schmoll Maschinen â stacking/pinning, entry foil and backup board in PCB drilling</a></li><li><a href="https://www.circuitnet.com/programs/54372.html" rel="noopener" target="_blank">Circuitnet technical paper â conformal back-up material and exit-burr reduction</a></li><li><a href="https://patents.google.com/patent/US20050176328A1/en" rel="noopener" target="_blank">US patent â PCB backup board, burr prevention, tool abrasion and moisture/warpage considerations</a></li><li><a href="https://patents.google.com/patent/JP5069046B2/en" rel="noopener" target="_blank">PCB drilling backup-material patent â controlled evaluation of resin wrapping around drills</a></li></ul><p class="note">These references support the mechanism and qualification logic. YUESHAN-specific performance claims still require current TDS, QC records or line-test evidence.</p></div></section><section class="section"><div class="wrap"><div class="quote"><h2>Request a qualification sample</h2><p>Send the current material and the drilling KPI you need to improve. YUESHAN can then discuss the relevant grade, technical document and sample rather than quoting a generic âbestâ board.</p><div class="actions"><a class="btn primary" href="/cdn-cgi/l/email-protection#09616c67686756717c4961667d64686065276a6664367a7c6b636c6a7d344b686a627c792c3b394b66687b6d2c3b395d4d5a2c3b3968676d2c3b395a686479656c">Email Mr. Lucky Xu</a><a class="btn secondary" href="https://wa.me/8613433290964">WhatsApp +86 13433290964</a></div></div></div></section></main><footer class="footer"><div class="wrap"><div class="footergrid"><div><h3>YUESHAN PCB Backup Boards</h3><p>Focused supply of HDF, melamine laminate, UV melamine and phenolic backup materials for PCB mechanical drilling qualification.</p></div><div><h3>Products</h3><p><a href="/products/hdf-backup-board/">HDF</a><br/><a href="/products/melamine-backup-board/">Melamine</a><br/><a href="/products/uv-melamine-backup-board/">UV Melamine</a><br/><a href="/products/phenolic-backup-board/">Phenolic</a></p></div><div><h3>Resources</h3><p><a href="/resources/choose-backup-board/">
28Selection Guide</a><br/><a href="/resources/exit-burr-control/">Exit Burr</a><br/><a href="/resources/drill-bit-breakage/">Drill Breakage</a><br/><a href="/resources/uv-warpage-after-cutting/">UV Warpage</a><br/><a href="/resources/cheap-pcb-backup-board-trap/">$1/Sheet Trap</a><br/><a href="/resources/pf-vs-uf-resin/">PF vs UF</a><br/><a href="/resources/resin-gunk-drill-wrap/">Resin Gunk</a></p></div><div><h3>Contact</h3><p>Mr. Lucky Xu<br/><a href="/cdn-cgi/l/email-protection#bbd3ded5dad5e4c3cefbd3d4cfd6dad2d795d8d4d6"><span class="__cf_email__" data-cfemail="a5cdc0cbc4cbfaddd0e5cdcad1c8c4ccc98bc6cac8">[email protected]</span></a><br/><a href="https://wa.me/8613433290964">WhatsApp +86 13433290964</a><br/>Fanhu Industrial Zone, Leping Town, Sanshui District, Foshan, Guangdong, China</p></div></div><div class="copyright">© 2026 YUESHAN. Product specifications on this website are qualification starting points; confirm the current TDS/SDS and sample results before production approval.</div></div></footer><a class="sticky-rfq" href="/#rfq">Send Your Drill Stack â</a>
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