Backup boards, aluminum entry boards, coated lubricant aluminum and back-drill sheets — every layer of your stack from one source.
A complete drill stack layup places an entry board on top and a backup board beneath the panel, steadying the drill bit and protecting hole-wall quality.
A matched set — backup board, entry sheet, and back-drill material working together — delivers better yield than optimising each component alone. All YUESHAN grades are qualified together so the interface between layers is predictable.
Backup boards control exit burr and absorb drill heat; entry boards locate the bit and suppress top-side burr; lubricant/coated aluminum adds thermal relief for microvias; back-drill sheets manage stub depth on high-speed channels. Each is engineered for its role — together they hold the hole quality your line requires.
HDF, Melamine & Phenolic grades engineered for clean holes
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1100 H18 full-hard aluminum entry sheets (0.15–0.20 mm)
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Thermoset (220°C) and water-soluble coated sheets for HDI/BGA/IC
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One-piece back-drill coated aluminum (0.16–0.19 mm) for 5G & servers
View Details →Products answers what you can buy. The Material Library explains what each material is, how it behaves, and where it fits in a drilling stack. Use the technical profiles for material properties, grade comparison and engineering reference; return to the product pages for samples, qualification and quotations.
Looking for alloy, temper, density, coating, surface, or backup-board material data? Start with the PCB Drilling Material Library, then move to the matching commercial product page when you are ready to qualify a grade or request a sample.
Technical profile for commercially pure, full-hard aluminum used as a standard PCB drill-entry layer.
AA1100 H18 Material Profile →Coating types, base aluminum and engineering behavior for HDI, BGA and IC-substrate drilling.
Lubricant Aluminum Material Profile →Density, flatness and drilling-role reference for cost-efficient standard multilayer PCB stacks.
HDF Material Profile →Technical reference for melamine-laminate backup material used for multilayer PCB drilling.
Melamine Material Profile →UV-coated melamine grade data for improved surface sealing, stability and demanding drill stacks.
UV Melamine Material Profile →Phenolic material profile for higher-precision exit support and tighter drilling-quality requirements.
Phenolic Material Profile →Most lines standardize a consumable set configuration around aluminum entry boards and phenolic or HDF backup boards to balance drill bit wear reduction against cost.
Three steps take you from a bare stack-up to a matched PCB drilling consumable set. Start from the board you actually drill, not from a material name.
Send us your layer count, smallest hole and current material — we return a matched grade set and samples, usually within one business day. Talk to Mr. Lucky Xu →
Each family plays a distinct role in the stack. Match the set to your board rather than buying one grade for everything.
| Family | Role in the stack | Best for | Common pairing |
|---|---|---|---|
| Backup Boards | Control exit burr, absorb drill heat | 2–24 L multilayer, standard PTH | Entry board on top |
| Aluminum Entry Boards | Locate the bit, suppress top-side burr | Every drilling stack | HDF / melamine backup |
| Lubricant & Coated Aluminum | Cool & lubricate the bit for microvia | HDI, BGA, IC substrate | Premium melamine backup |
| Back-drill Aluminum | Control stub depth on high-speed channels | 5G, server, backplane | Coated entry + back-drill sheet |
For high-speed digital boards, see how the entry and back-drill materials work together in our 5G & server drilling solution.
The entry board sits on top and locates the drill bit while suppressing top-side burr. The backup board sits underneath and controls exit burr and absorbs heat. Both are needed for clean holes — see the backup board range and aluminum entry boards.
Both. Many customers buy a matched set qualified together; others reorder a single grade. Tell us your stack and we recommend the combination.
Match grade to exit-burr requirement and layer count — HDF for cost-first, melamine for multilayer/HDI, phenolic for tight exit quality. The choose-a-backup-board guide walks through it.
Yes. We ship samples, TDS/MSDS and a free spec comparison with your current supplier. Request TDS & Free Sample →
Products are commercial pages for choosing, qualifying and ordering YUESHAN consumables. The Material Library is the technical reference layer for alloy, temper, density, coating, material behavior and grade comparison. The two sections are linked, but they serve different search and buyer intents.