Canvas Grades C and CE, also known as NEMA C or CE are Canvas Cotton-Cloth Reinforced Phenolics. Canvas Phenolic grades are composed of a continuous cotton woven cloth, impregnated with a phenolic resin binder. They are commonly used for electrical insulators and printed circuit boards, among other uses. Some common trade names for Canvas Phenolic are Bakelite® and Micarta.
- Color: Light tan to brown
- Grade C certifies to Mil-I-24768/16 FBM and MIL-P-15035 FBM
- Grade CE certifies to Mil-I-24768/14 FBG and MIL-P-15035 FBG
| Mechanical | ASTM Test Method | Grade C Phenolic | Grade CE Phenolic | Units |
|---|---|---|---|---|
| Strength to Weight Ratio | - | - | - | ksi |
| Specific Gravity @73 F | D792 | 1.35 | 1.35 | - |
| Tensile Strength @73 F, (ult)/(yld) | D638 | 9,500 (ult) | 9,500 (ult) | psi |
| Tensile Modulus of Elasticity @73 F | D638 | - | - | psi |
| Tensile Elongation at Break @73 F | D638 | - | - | % |
| Flexural Strength @73 F | D790 | 17,000 | 17,000 | psi |
| Flexural Modulus of Elasticity @73 F | D790 | 950,000 | 950,000 | psi |
| Shear Strength @73 F | D732 | 11,500 | 11,500 | psi |
| Comprehensive Strength, (% Deformation) @73 F | D695 | 37,000 (10) | 37,000 (10) | psi |
| Comprehensive Modulus of Elasticity @73 F | D695 | - | - | psi |
| Hardness, Rockwell, Scale as noted @73 F | D785 | (M104) | (M104) | - |
| Hardness, Durometer, Shore D @73 F | D2240 | - | - | - |
| Izod Impact, (Notched) @73 F | D256 Type A | 3.2 | 2.3 | 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 | Grade C Phenolic | Grade CE 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.) | - | 265 | 265 | F |
| Thermal Conductivity | - | - | - | BTU-in/hr-ft2-F |
| Electric | ASTM Test Method | Grade C Phenolic | Grade CE Phenolic | Units |
|---|---|---|---|---|
| Dielectric Strength, Short Term | D149 | 150 | 360 | Volts/mil |
| Volume Resistivity | D257 | - | - | ohm-cm |
| Dielectric Constant @10E6 Hz | D150 | - | 5.8 | - |
| Dissipation Factor @10E6 Hz | D150 | 0.1 | 0.055 | - |
| Flammability @3.1 mm unless noted | UL94 | HB | HB | - |
| H2O | ASTM Test Method | Grade C Phenolic | Grade CE Phenolic | Units |
|---|---|---|---|---|
| Water Absorption, Immersion, 24 hours | D570(7) | 1.2 | 0.75 | % by weight |
| Water Absorption, Saturation | D570(7) | - | - | % by weight |