HF-HWC - 2-Component Hard-Coat Screen Printing Ink
1. Overview & Applications
The HF-HWC Series is a high-performance, 2-component reactive screen printing ink explicitly formulated to bond with extreme surface-treated substrates. It provides a semi-gloss finish, exceptional surface smoothness, robust flexibility, and extreme chemical and abrasion resistance.
Primary Specialized Substrates: Hard-coated Acrylic (≤ 3H hardness), Hard-coated PC, and Hard-coated PET films.
General Substrates: Standard Acrylic, Metals, PVC sheets, ABS, Baked Enamel Panels, and UV Coated Panels.
2. Physical & Chemical Performance
Testing Conditions: Printed on Acrylic panel using a 250-mesh screen (Colors: 120 White, 710 Black). Forced baked at 70°C for 60 minutes, then rested at room temperature for 1 week.
| Gloss Finish | Semi-Gloss |
|---|---|
| Adhesion (Cross-Hatch) | Tape Peel Test: 100% Retention |
| Pencil Hardness | ≥ 3H |
| Alcohol Resistance | Cotton swab with alcohol, 500g load, 200 rubs: No abnormalities |
| MEK (Strong Solvent) Resistance | Cotton cloth with Cyclohexanone/MEK, 500g load, 20 rubs: No abnormalities |
| Skin Care Product Resistance | Cotton cloth with cosmetic lotion, 1000g load, 100 rubs: No abnormalities |
| Thermal Shock / Cycling | 20 cycles of: [80°C for 2 hrs] ➔ [Room Temp 0.5 hrs] ➔ [-20°C for 2 hrs] ➔ [Room Temp 0.5 hrs]: No abnormalities |
| Water Resistance | Submersed in tap water for 1 week: No abnormalities |
3. Color Series
The HF-HWC series is available in the following standard solid colors, specifically formulated for high adhesion and opacity.
- Whites & Blacks: 120 White, 121 High-Density Extra White, 710 Black, 711 Insulating (Non-Conductive) Black.
- Colors: 210 Lemon Yellow, 265 Orange-Red, 500 Fiery Red, 510 Deep Red, 580 Peach/Magenta, 495 Purple, 400 Light Blue, 440 Blue, 350 Green.
- Clear Base: 800 Clear Varnish Base.
4. Mixing Formula & Processing Guidelines
Mandatory 2-Component Formulation
This ink relies on a strict chemical cross-linking process. Stir the base ink thoroughly before adding the hardener and thinner.
| HF-HWC Ink | 100 Parts |
|---|---|
| HAC-S Hardener | 10 Parts |
| Thinner | 20 - 30 Parts. (S-700 Standard Thinner or S-800 Slow-Dry Thinner). *Recommendation: Use S-800 Slow-Dry Thinner when printing fine text to prevent screen clogging. |
Pot Life & Curing Requirements
- Pot Life: Once the hardener is mixed, the ink must be used within 4 to 6 hours. Higher workshop temperatures will significantly shorten this usable window.
- Touch Dry: 20 to 30 minutes at room temperature (25°C).
- Mandatory Baking (Full Cure): To achieve the stated 3H hardness and extreme chemical resistance, the printed substrates MUST be force-baked at 70°C for 60 minutes, followed by a 24-hour rest at room temperature.
Storage & Precautions
- Hardener Sensitivity: The HAC-S Hardener is highly sensitive to atmospheric moisture. Reseal the container immediately after use.
- Store the ink in a cool, dry place away from heat and open flames. Shelf life is 24 months.
- Do not intermix HF-HWC Series inks with other brands to prevent adverse chemical reactions.
Want to see commercial applications and printing examples for this hard-coat ink?
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