Grade X Paper Phenolic is a thermoplastic polymer reinforced with paper fibers. It is a light-weight material which can be used in a variety of applications as a more-durable glass substitute. Paper-based phenolic is the most economical of the laminates, yet provides significant electrical properties and good mechanical properties. The more X’s the better the electrical properties, while the fewer X’s represent superior mechanical properties. Paper grades can be modified by adding plasticizers to make them more conducive to punching resulting in a “P” suffix added to the “X” designation (XP, XXP, XXXP).
- Grade X certifies to MIL-I-24768/12 (PBM),
- MIL-I-24768/19 (PBM-P)
- MIL-I-24768/20 (PBM-PC)
- MIL-I-24768/24 (PBM-PF)
| Mechanical | ASTM Test Method | Value | Units |
|---|---|---|---|
| Strength to Weight Ratio | - | - | ksi |
| Specific Gravity @73 F | D792 | 1.36 | - |
| Tensile Strength @73 F, (ult)/(yld) | D638 | 20,000 | psi |
| Tensile Modulus of Elasticity @73 F | D638 | - | psi |
| Tensile Elongation at Break @73 F | D638 | - | % |
| Flexural Strength @73 F | D790 | 25,000 | psi |
| Flexural Modulus of Elasticity @73 F | D790 | 1,800,000 | psi |
| Shear Strength @73 F | D732 | 12,000 | psi |
| Comprehensive Strength, (% Deformation) @73 F | D695 | 36,000 (10) | psi |
| Comprehensive Modulus of Elasticity @73 F | D695 | - | psi |
| Hardness, Rockwell, Scale as noted @73 F | D785 | M110 | - |
| Hardness, Durometer, Shore D @73 F | D2240 | - | - |
| Izod Impact, (Notched) @73 F | D256 Type A | 4.0 | ft-lb/in of notch |
| Coefficient of Friction, (Dry vs Steel) Dynamic | - | - | - |
| Limiting PV, (with 4 to 1 factor of safety applied) | - | - | psi-ft/min |
| Thermal | ASTM Test Method | Value | Units |
|---|---|---|---|
| Coefficient of Linear Thermal Expansion @73 F | E-831 (TMA) | - | in/in/F |
| Heat Deflection Temperature @264 psi | D648 | - | F |
| Tg-Glass transition termperature, (Amorphous) | D3418 | - | F |
| Melting Point, (VS=Vicat Softening Temp.) | D3418 | - | F |
| Continuous Service Temperature in Air, (Max.) | - | 285 | F |
| Thermal Conductivity | - | - | BTU-in/hr-ft2-F |
| Electric | ASTM Test Method | Value | Units |
|---|---|---|---|
| Dielectric Strength, Short Term | D149 | 500 | Volts/mil |
| Volume Resistivity | D257 | - | ohm-cm |
| Dielectric Constant @10E6 Hz | D150 | 6 | - |
| Dissipation Factor @10E6 Hz | D150 | 0.06 | - |
| Flammability @3.1 mm unless noted | UL94 | HB | - |
| H2O | ASTM Test Method | Value | Units |
|---|---|---|---|
| Water Absorption, Immersion, 24 hours | D570(7) | 1.10 | % by weight |
| Water Absorption, Saturation | D570(7) | - | % by weight |