Paper, cotton, and linen phenolics are composites of paper, cotton, or linen in a thermosetting plastic. Some common trade names for Phenolic materials are Bakelite® and Micarta.
- Grade X Phenolic corresponds to MIL-I-24768/12
- Grade XX Phenolic corresponds to MIL-I-24768/11
- Grade XXX Phenolic corresponds to MIL-I-24768/10
- Grade C Phenolic corresponds to MIL-I-24768/16 and MIL-P-15035 (FBM)
- Grade CE Phenolic corresponds to MIL-I-24768/14 and MIL-P-15035 (FBG)
- Grade L Phenolic corresponds to MIL-I-24768/15 and MIL-P-15035 (FBI)
- Grade LE Phenolic corresponds to MIL-I-24768/13 and MIL-P 15035 (FBE)
| Grade X Phenolic | Grade XX Phenolic | Grade XXX Phenolic | Grade C and CE Phenolics | Grade L and LE Phenolics | |||
| Mechanical | ASTM Test Method | Paper Phenolic | Paper Phenolic | Paper Phenolic | Cotton Canvas Phenolic | Linen Phenolic | Units |
|---|---|---|---|---|---|---|---|
| Strength to Weight Ratio | - | - | - | - | - | - | ksi |
| Specific Gravity @73 F | D792 | 1.36 | 1.34 | 1.32 | 1.35 | 1.34 | - |
| Tensile Strength @73 F, (ult)/(yld) | D638 | 20,000 | 16,000 | 15,000 | 9,500 | 12,500 | psi |
| Tensile Modulus of Elasticity @73 F | D638 | - | - | - | - | - | psi |
| Tensile Elongation at Break @73 F | D638 | - | - | - | - | - | % |
| Flexural Strength @73 F | D790 | 25,000 | 15,000 | 13,500 | 17,000 | 15,000 | psi |
| Flexural Modulus of Elasticity @73 F | D790 | 1,800,000 | 1,400,000 | 1,300,000 | 950,000 | 1,050,000 | psi |
| Shear Strength @73 F | D732 | 12,000 | 11,000 | 10,000 | 11,500 | 11,750 | psi |
| Comprehensive Strength, (% Deformation) @73 F | D695 | 36,000 (10) | 34,000 (10) | 32,000 (10) | 37,000 (10) | 37,000 (10) | psi |
| Comprehensive Modulus of Elasticity @73 F | D695 | - | - | - | - | - | psi |
| Hardness, Rockwell, Scale as noted @73 F | D785 | M110 | M105 | M110 | M104 | M105 | - |
| Hardness, Durometer, Shore D @73 F | - | - | - | - | - | - | - |
| Izod Impact, (Notched) @73 F | D256 Type A | 4.0 | 1.3 | 1.0 | 3.2/2.3 | 2.5/1.8 | 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 | Paper Phenolic | Paper Phenolic | Paper Phenolic | Cotton Canvas Phenolic | Linen Phenolic | 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 | 285 | 285 | 265 | 265 | F |
| Thermal Conductivity | - | - | - | - | - | - | BTU-in/hr-ft2-F |
| Electric | ASTM Test Method | Paper Phenolic | Paper Phenolic | Paper Phenolic | Cotton Canvas Phenolic | Linen Phenolic | Units |
|---|---|---|---|---|---|---|---|
| Dielectric Strength, Short Term | D149 | 500 | 500 | 470 | 150/360 | 150/360 | Volts/mil |
| Volume Resistivity | D257 | - | - | - | - | - | ohm-cm |
| Dielectric Constant @10E6 Hz | D150 | 6 | 5.5 | 5.3 | -, 5.8 | -, 5.8 | - |
| Dissipation Factor @10E6 Hz | D150 | 0.06 | 0.045 | 0.038 | 0.1, 0.055 | 0.1, 0.055 | - |
| Flammability @3.1 mm unless noted | UL94 | HB | HB | HB | HB | HB | - |
| H2O | ASTM Test Method | Paper Phenolic | Paper Phenolic | Paper Phenolic | Cotton Canvas Phenolic | Linen Phenolic | Units |
|---|---|---|---|---|---|---|---|
| Water Absorption, Immersion, 24 hours | D570(7) | 1.10 | 0.55 | 0.45 | 1.20, 0.75 | 0.9, 0.7 | % by weight |
| Water Absorption, Saturation | D570(7) | - | - | - | - | - | % by weight |