HC Clear™ is a clear hard coating that can be applied to both acrylic and polycarbonate cover glass.
This solution provides high scratch and abrasion resistance, graffiti resistance, and improved
weather performance. It also has excellent optical quality and can be applied on one or both sides of the optical filter regardless of the base material.
Depending on the base material, HC Clear provides a scratch resistance of pencil hardness 4-8H.
HC Clear is a very versatile solution that can be applied to any kind of optical filter or display window that needs scratch resistance.
In the tables below, the properties of HC Clear on polycarbonate is presented.
To see the technical properties of HC Clear on PMMA, please refer to this product page.
| Parameter | Test | Result |
|---|---|---|
| Refractive index | ISO 489 | 1,428 (1,585) nd 20 |
| Transparency 380-780nm D = 3mm | DIN 5036 | >86 % |
| Deviation angle | DIN 52305 | <5 Bg |
| Refractive power | DIN 52305 | <0.1 Dpt |
| Parameter | Test | Result |
|---|---|---|
| Bulk Density | ISO 1183 | 1.2 g/cm³ |
| Water absorption 24 hours, 23 °C | ISO 62 | <8 mg/kg |
| Tensile strength | ISO 527 | 60 MPa |
| Modulus of elasticity | ISO 527 | 2200 MPa |
| Impact resistance | ISO 179 | Did not break |
| Extensibility of surface | DIN 53455 | 1,2 % |
| Abrasion (Taber-process, 100 rotations, CS-10F, 500g force) | ISO 9352 | 1.4-1.8 % Haze |
| Thickness of layer | - | 4.8 µ |
| Adhesive properties (0,5 hour boiling period @ 100 °C) | ISO 2409 | GT 0 °C |
| Adhesive properties (1 hour boiling period @ 100 °C) | ISO 2409 | GT 0 °C |
| Adhesive properties (2 hour boiling period @ 100 °C) | ISO 2409 | GT 0 °C |
| Climatic resistance | ISO 4892 | 0,1 % difference |
| Sand trickle test | DIN 52348 | 4 % Haze |
| Parameter | Test | Result |
|---|---|---|
| Vicat diluting temperature VST/B 50 | ISO 306 | 150 °C |
| Constancy temperature HDT/A (2,8 N/mm²) | ISO 75 | 135 °C |
| Temperature of permanent use | DIN 53446 | 115 °C |
| Linear coefficient of cubical thermal expansion (α) 0-50 °C | DIN 53752 | 65 x 10⁻⁶ K⁻¹ |
| Heat conductibility (λ) | DIN 56612 | 0,21 W/mK |
| Specific heat (c) | - | 1,3 J/gK |
| Parameter | Test | Result |
|---|---|---|
| Specific volume resistivity | DIN VDE 0303 | 10¹⁵ Ωcm |
| Dielectric strength | DIN EN 60243 | >30 kV/mm |
| Parameter | Test | Result |
|---|---|---|
| Fire behavior | DIN 4102 | Fire classification B 2 |
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