Lubricant and coated aluminum entry sheets carry a resin film that cools and lubricates the bit, cutting wear and tightening hole-position accuracy on HDI, BGA and IC-substrate microvias. YUESHAN's default green thermoset-coated (220 C) avoids hole-halo on dense microvias; the base must be 0.10 mm or less for sub-0.15 mm vias.
Key Takeaways
- Our default push is the green thermoset-coated (thermoset 220°C): stable film, no hole-halo on dense IC/HDI microvias — the grade we benchmark against leading coated-aluminum.
- Thermoset-coated: 220°C tolerance, cooling 8/10, lubrication 8/10 — for microvias <Ø0.15 mm.
- Water-soluble: lower cost but humidity-sensitive — not for <Ø0.10 mm.
- Aluminum base thickness must be ≤0.10 mm for sub-Ø0.15 mm vias.
💡 Field note — why the green thermoset-coated is our default: In dense IC-substrate and HDI drilling, a stable thermoset film (220°C) avoids the hole halo (resin ring / 孔晕) that softer water-soluble films can leave around tightly-packed microvias. So when a customer asks "which coated aluminum?", we lead with the green thermoset-coated and treat water-soluble / general as cost or climate options — not the default.
What a Coated Entry Sheet Does
The coating lowers the friction coefficient at the drill point, driving drill temperature reduction and tool life extension on long production runs.
A resin-lubricant film on the drill-entry face cools and lubricates the bit, cuts wear and tightens hole-position accuracy — especially for HDI, BGA and IC-substrate microvias. Pick the film chemistry to your smallest hole and your climate.
Subtype Comparison
| Subtype | Film | Best for | Watch-out |
|---|---|---|---|
| Thermoset 220°C | Resin, heat-stable | HDI / BGA / IC <Ø0.15 mm | Premium cost |
| Water-soluble | Soluble resin | General HDI >Ø0.10 mm | Humidity-sensitive |
| HDI · BGA · IC | Premium thermoset | Microvia, best accuracy | <Ø0.15 mm only |
| General | Standard coated | Through-hole / multilayer | Not for microvia |
💡 Which type, when? The green thermoset-coated (thermoset 220°C) is the default for HDI / BGA / IC microvias. Choose water-soluble only for general HDI above Ø0.10 mm in dry plants (lower cost, but humidity-sensitive). HDI·BGA·IC and General are the same thermoset family tuned to hole size and climate — tell us your smallest hole and we match the grade.
Coating Options
Thermoset Coated Aluminum (220°C)
★ Recommended default · thermoset-coated alternative · heat-stable film · no melt rings
| Property | Spec |
|---|---|
| Film | Thermoset resin |
| Temp stability | up to 220°C |
| Base | Aluminum ≤0.10 mm |
| CpK | Stable, uniform film |
Technical highlights
- Does not soften at drilling temperature — no hole-wall melt rings.
- Uniform film thickness with stable CpK, lot to lot.
- Engineered as an leading coated-aluminum alternative at comparable cost per good hole.
Recommended pairing
UV Melamine 880
HDI / multilayer backup.
Phenolic PHE
IC substrate backup.
Sizes & packaging
| Size (mm) | Base (mm) | Sheets / pallet | MOQ |
|---|---|---|---|
| 940 × 1245 | 0.10 | 400 | 100 sheets |
| 520 × 620 | 0.10 | 1000 | 200 sheets |
Storage
Store flat at ≤25°C, RH <50%. Film side protected from moisture before use.
Water-soluble Coated Aluminum
Lower cost · humidity-sensitive · general HDI
| Property | Spec |
|---|---|
| Film | Water-soluble resin |
| Base | Aluminum ≤0.15 mm |
| Best hole | > Ø0.10 mm |
Technical highlights
- Lower material cost than thermoset.
- Easy post-process rinse.
- Avoid in rainy / high-humidity plants — sheets can stick.
Recommended pairing
HDF Backup Board
Cost-first lines.
Sizes & packaging
| Size (mm) | Base (mm) | Sheets / pallet | MOQ |
|---|---|---|---|
| 940 × 1245 | 0.15 | 400 | 100 sheets |
Storage
Keep carton sealed, ≤25°C, RH <50%. Use promptly after opening.
HDI · BGA · IC Coated Aluminum
Premium thermoset · microvia · best location accuracy
| Property | Spec |
|---|---|
| Film | Premium thermoset |
| Base | Aluminum ≤0.10 mm |
| Target | sub-Ø0.15 mm via |
Technical highlights
- Tightest hole-position accuracy for microvia.
- Proven on HDI, BGA and IC-substrate lines.
- Side-by-side comparable to L.C.O on CpK and cost per hole.
Recommended pairing
Melamine 880
HDI backup.
Back-drill Aluminum
Controlled-depth stubs.
Sizes & packaging
| Size (mm) | Base (mm) | Sheets / pallet | MOQ |
|---|---|---|---|
| 940 × 1245 | 0.10 | 400 | 100 sheets |
Storage
Store flat at ≤25°C, RH <50%. Film side protected before use.
General Coated Aluminum
Standard coated · through-hole / multilayer
| Property | Spec |
|---|---|
| Film | Standard coated |
| Base | Aluminum 0.10–0.15 mm |
| Best for | Through-hole, multilayer |
Technical highlights
- Balanced cooling + lubrication for standard drilling.
- Cost-effective default for non-microvia lines.
Recommended pairing
HDF / Melamine
Standard backup.
Sizes & packaging
| Size (mm) | Base (mm) | Sheets / pallet | MOQ |
|---|---|---|---|
| 940 × 1245 | 0.15 | 400 | 100 sheets |
Storage
Store flat at ≤25°C, RH <50%.
Applications
Coated sheets are especially valued for microvia drilling stability and hole-wall smear reduction in fine-pitch HDI.
Coated aluminum is specified wherever microvia accuracy and bit life are critical:
How to Specify Your Coated Aluminum
Four inputs let us match the film, base and CpK to your line.
Smallest hole
Below Ø0.15 mm → thermoset 220°C film. Above Ø0.10 mm in dry plants → water-soluble to save cost.
Plant climate
Humid or rainy sites should stay on thermoset; water-soluble film can stick in high RH.
Base thickness
Microvia needs aluminum base ≤0.10 mm; general HDI can use up to 0.15 mm.
CpK report
Ask for lot-level CpK on film thickness — we supply it for traceable, stable yield.
Send these four inputs and your current leading coated-aluminum spec — we'll return a YUESHAN side-by-side sample for direct comparison against your back-drill aluminum sheet and entry stack.
Why Engineers Choose YUESHAN
220°C thermoset film
No melt rings at drilling temperature — cleaner hole walls than soluble films.
Coated alternative
Matched on film, base and CpK at comparable cost per good hole.
Stable CpK
Uniform film thickness, lot to lot — predictable microvia yield.
Free bench test
Send your leading coated-aluminum spec; we return a side-by-side sample.
Related Products
FAQ
Thermoset or water-soluble?
For microvia below Ø0.15 mm and humid plants, use thermoset (220°C). Water-soluble fits general HDI above Ø0.10 mm where cost leads.
Can you match my leading coated-aluminum spec?
Yes — send your current coated-aluminum spec and we return a side-by-side sample matched to film, base and CpK.