Tables
The following conformal coating comparison guide is general and it serves as a broad comparison of strengths and weaknesses.
| Acrylic (AR) | Polyurethane (UR) | Epoxy (ER) | Silicone (SR) | Parylene (XY) | |||
| C | D | N | |||||
| Humidity Resistance | 2 | 1 | 2 | 1 | 2 | 2 | 1 |
| Humidity Resistance (Extended Periods) | 2 | 1 | 3 | 2 | 2 | 2 | 1 |
| Abrasion Resistance | 3 | 2 | 1 | 4 | 1 | 1 | 1 |
| Mechanical Strength | 3 | 1 | 1 | 2 | 1 | 1 | 1 |
| Temperature Resistance | 2 | 3 | 3 | 1 | 2 | 2 | 1 |
| Acid Resistance | 3 | 1 | 1 | 2 | 1 | 1 | 1 |
| Alkali Resistance | 3 | 1 | 1 | 2 | 1 | 1 | 1 |
| Organic Solvent Resistance | 4 | 1 | 1 | 2 | 1 | 1 | 1 |
| Dielectric Constant (1MHz@23°C) | 2.2-3.2 | 4.2-5.2 | 3.3-4.0 | 2.6-3 | 2.87 | 2.83 | 2.67 |
| Outgassing | 3 | 2 | 3 | 4 | 1 | 1 | 1 |
| Electrical Impedance | 2 | 4 | 3 | 2 | - | - | - |
| Optical Clarity | 4 | 3 | 1 | 2 | 2 | 2 | 2 |
| Bio Compatibility | - | - | - | - | 1 | 1 | 1 |
| Thermal Stability | 1-2 | 2 | 2 | 1-2 | 1 | 1 | 1 |
| Electrical Insulation | 1-2 | 1-2 | 1-2 | 2 | 2 | 2 | 1 |
| Reworkability | 1 | 3 | 3 | 2 | 4 | 4 | 4 |
| VOC's | 1-3 | 2-3 | 2-3 | 1-2 | 1 | 1 | 1 |
| RoHS | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Thermal Conductivity | 2-3 | 2-3 | 2-3 | 2-3 | 3 | 3 | 3 |
| Adhesion | 2-3 | 1-2 | 1-2 | 1-3 | 2 | 2 | 2 |
Example: Coating Selection Guide
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