Direct answer: YUESHAN HDF PCB backup boards for standard multilayer drilling. HDF 840/880/950 density grades, 70 HD class, flatness ≤0.10 mm, standard 2.0/2.5 mm options, TDS, samples and factory supply. Buyers typically qualify it by density/hardness, thickness, flatness, moisture behavior, exit burr, drill wear and compatibility with the entry sheet.
Key Takeaways
- Everything on this page is the commercial view of the HDF grade: supplier, specification, sample, TDS/SDS and quotation.
- The Material Profile covers fibreboard density grades, internal bond and how moisture content is controlled.
- Entities this grade is indexed under: HDF PCB backup board, wood backup board, high density fiberboard PCB drilling, drill backup board, backing board, 840 HDF, 880 HDF, 950 HDF, density, internal bond, moisture content, flatness, drill burr, drill breakage.
HDF PCB Backup Board Supplier for PCB Drilling
HDF is the cost-performance baseline in the YUESHAN backup-board family. Use it for standard multilayer drilling where density, flatness and clean exit support matter more than a sealed premium surface. Step up to UV Melamine when humidity, smear or tighter HDI tolerances become the limiting factor.
Industry pages ranking around this product category consistently use procurement entities such as backup board, backing board, drilling support, density, thickness tolerance, surface hardness, warpage, standard sizes, HDF core, FPC, HDI, BGA, multilayer PCB and customized size. This page integrates those terms only where they describe a real buyer decision.
Commercial Specifications
| Specification | YUESHAN |
|---|---|
| Material | High Density Fiberboard (HDF) |
| Density grades | 840 / 880 / 950 kg/m³ class |
| Hardness | 70 HD class |
| Flatness | ≤0.10 mm |
| Substrate thickness | 2.0 / 2.4 mm |
| Application | Standard 2–12 layer PCB drilling |
Standard board formats: 940 × 1245 mm (37 × 49 in), 1041 × 1245 mm (41 × 49 in) and 1092 × 1245 mm (43 × 49 in). HDF is supplied at 2.0 mm and 2.4 mm; the 2.4 mm substrate is also the base board the UV-faced and melamine-faced grades are built on. Cut pieces such as 520 × 620 mm are cut down from the standard boards, and non-standard formats are discussed against the ordered quantity. Confirm the current TDS before final drawing release or incoming inspection.
Grade Selection
| Grade | Density target | Typical role |
|---|---|---|
| HDF 840 | 840 kg/m³ class | Cost-first double-sided / low-layer PCB |
| HDF 880 | 880±30 kg/m³ | Standard 2–12 layer production |
| HDF 950 | 950 kg/m³ class | Higher-density support where extra rigidity is required |
Use the PCB Backup Board Selector if you want a quick starting grade from layer count, smallest drill, humidity and exit-burr target.
What the HDF Grade Is Built to Control
- Cost per good hole: the entry point of the range — an 880±30 kg/m³ fibreboard priced under every coated grade, for work where a plain landing layer is enough.
- Drill-bit breakage on standard stacks: a homogeneous board gives the bit a predictable landing instead of an unsupported break-out.
- Stack height arithmetic: supplied at 2.0 mm and 2.4 mm, so the backup layer is a known term in the stack rather than a variable to be re-measured.
- Warpage across a pallet: held to 0.5% with a thickness tolerance of ±0.15 mm, so pallet handling does not move the support plane.
- In-plane uniformity: fibreboard density does not vary from edge to centre the way a laminated build-up can, so the drill sees the same board at every coordinate.
- Ordering without a second lead time: 250 sheets per pallet and 24 to 26 pallets per container, so it can travel with the coated grades on one shipment.
HDF vs the Coated Grades, and Phenolic
The HDF column is the cost baseline that every other grade has to justify itself against.
| Backup type | Cost position | Typical layer window | Detail |
|---|---|---|---|
| HDF | Lowest board cost in the range; 880±30 kg/m³ | 2–12 layer standard drilling | This page |
| Melamine Laminate | Mid; adds a hot-pressed melamine face to the same idea | 6–24 layer precision work, FPC and rigid-flex | melamine laminate board |
| UV Melamine | Upper mid; adds UV sealing where the room is humid | 6–24 layer HDI, microvia and back-drill work | UV-sealed board |
| Phenolic PHE | Specialist; bought for rigidity rather than for cost | Selected IC-substrate and precision routing work | phenolic PHE grade |
Where the HDF Grade Is Specified
Standard Multilayer Production
Where a plain landing layer meets the burr target and the programme is measured in cost per good hole.
Standard drilling selection guide →High-Volume Double-Sided Boards
Short stacks and large drill diameters, where board consumption per shift matters more than surface refinement.
Multilayer drilling basics →Cost-Down Projects
Where a coated grade is being paid for but the burr and breakage data say a plain board would hold the line.
Automotive and 5G lines →Plant & Process Evidence Behind the HDF Substrate
HDF is the base board of the range, so the evidence here is about the fibre core and how it is kept flat — the incoming stock, the storage rule and the per-batch release test.
Buyer Qualification Checklist for a Standard Stack
HDF questions are about the stack and the cost case:
- layer count, and whether the work is double-sided or multilayer;
- thickness needed — 2.0 mm or 2.4 mm — and the tolerance that actually matters to the stack;
- drill diameter range and panels per stack;
- exit-burr target and drill-bit consumption per shift;
- board format, including whether 520 × 620 mm cut pieces are needed;
- annual container count and destination port.
Send the stack details to Mr. Lucky Xu →
Entry-Side Pairing on a Cost-First Stack
A lowest-cost stack still needs a defined entry side — fix that end before paying for a coated backup board.
AA1100 H18 Aluminum Entry Sheet
Keeps the cost-per-hole case intact on 2–12 layer standard drilling and pairs with the 880 grade without re-qualifying it.
AA1100 H18 entry sheet →Lubricant-Coated Aluminum
If the plain landing layer stops meeting the burr target, correcting the entry side is usually cheaper than moving the whole stack to a coated backup board.
Lubricant aluminium sheet →Ordering, Lead Time & Customization
Minimum Order & Pricing Basis
Shipped on a 1 × 20GP container basis with mixed grades in one container, and EXW terms below a full container. HDF loads 250 sheets per pallet and 24 to 26 pallets to a container. It is priced on the standard board formats in the published density grades, and because it shares its function with the lubricated backup board the two can be quoted side by side for a like-for-like comparison.
Lead Time Logic
Lead time runs 12 days from receipt of the order for a two-container booking. HDF is the base board the coated grades are built on, so the 2.0 mm and 2.4 mm stocks carry the shortest schedule; a thickness or density outside the published bands is quoted separately and does not follow the standard plan.
Customization Limits
Supplied as 940 × 1245 mm (37 × 49 in), 1041 × 1245 mm (41 × 49 in) and 1092 × 1245 mm (43 × 49 in) boards at 2.0 mm and 2.4 mm. Cut-to-size pieces such as 520 × 620 mm are taken from these standard boards. Cutting is therefore available inside the standard format, while non-standard formats are discussed against quantity and the grade is not offered outside the published density bands.
Industry & Standards Reference Set
- ISO 16895 — dry-process fibreboard properties
- PCB wood backup board terminology
- YUESHAN technical material profile for this product
Always qualify YUESHAN using its current TDS and sample results.
FAQ
What is HDF PCB Backup Board?
It is a high-density fibreboard used as a plain landing layer on the exit side of the drill stack. This page carries the commercial specification, qualification, sample and ordering detail; composition and process mechanisms are in the material library at https://www.yueshanpcb.com/materials/hdf/.
What thickness is HDF supplied in?
2.0 mm and 2.4 mm. The 2.4 mm substrate is also the base board the UV-faced and melamine-faced grades are built on, so it is available on the same container plan.
When should we move up to a coated grade?
When your own burr or drill-breakage data say the plain landing layer has stopped holding the target — or when the room is humid, or the smallest hole is fine enough that hole-wall quality starts driving the desmear load rather than board cost.
Can we run HDI and microvia work on HDF?
It is not the intended grade. Fine holes and back-drill depth control are where the coated grades earn their cost; HDF is specified for 2–12 layer standard drilling.
What is the minimum order and lead time?
Export orders ship on a 1 × 20GP container basis with mixed grades allowed in one container; below a full container, EXW terms apply. Lead time runs 12 days from receipt of the order for a two-container booking, and the 2.0 mm and 2.4 mm stocks hold the shortest schedule.