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 →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 →