Product Overview
HD-7240 is a 38 μm alkaline-developable dry film photoresist for outer-layer circuit formation on hard boards using LDI.
It combines high photosensitivity, rapid low-energy imaging, strong adhesion, high resolution, and high PE film strength. Compared with HD-7540, it offers faster stripping and higher film dissolution capacity to support efficient high-density outer-layer production.
Technical Specifications
| Technical Parameter | Typical Value |
|---|---|
| Dry Film Thickness | 38 µm |
| Exposure Energy (SST = 7/21) | 20 mJ/cm² |
| Sensitivity (21ST) | 7 ± 1 |
| Developing Time | 30–40 s |
| Resolution (SST = 6/21) | 40 µm |
| Adhesion (SST = 6/21) | 45 µm |
| Stripping Condition | 3% NaOH, 50°C, 55 s |
| Available Dry Film Width | 150–800 mm |
| Dry Film Length | 492 ft (150 m) |
HD-7240 Technical Data Sheet · PDF · Receive your private download link by email
Key Features
LDI Ready
Developed for laser direct imaging on hard-board outer layers.
Low-Energy Rapid Imaging
High photosensitivity supports efficient image formation.
Efficient Stripping
Offers faster stripping and higher dissolution capacity than HD-7540.
Applications
LDI imaging for high-density hard-board outer-layer circuit formation, anti-plating, and direct etching.
Product Format & Dimensions
| Item | Specification |
|---|---|
| Dry film thickness | 38 µm |
| Available dry film width | 150–800 mm; slit to the specified width |
| Standard dry film length | 656 ft (200 m) |
Recommended Processing Conditions
| Step | Recommended condition |
|---|---|
| Board pre-treatment | Remove debris, oil and oxides; rinse and dry. |
| Lamination | Roll temperature 110 ± 10°C; pressure 4–5 kg; manual speed 1.0–1.5 m/min or automatic speed 2.0–3.0 m/min. |
| Hold before exposure | Under yellow/orange safe light: 20 ± 2°C, 60 ± 10% RH, 5 min to 24 h; keep boards upright. |
| Exposure | Laser direct imaging is recommended; LED or mercury lamp may also be used. Use a 21-step exposure guide at 6–8 steps. |
| Development | 0.8–1.2% anhydrous sodium carbonate at 30 ± 2°C; spray pressure 0.12–0.20 MPa. |
| Stripping | 3–5 wt% sodium hydroxide at 50 ± 5°C; spray pressure ≥ 0.2 MPa. |
Safety & Storage Guidelines
- Use appropriate safe lighting and avoid prolonged light exposure.
- Avoid direct contact with the photosensitive layer. Provide adequate exhaust during lamination and wear eye and hand protection for alkaline chemicals.
- Store horizontally at 5–20°C and 40–60% RH; protect unused material in black packaging and use within 60 days.