X, XX, XXX PHENOLIC (PAPER BASED)
Material Information
Phenolics are thermoset resins formed by the polymerization of phenol and formaldehyde, which can then be impregnated with cotton canvas or linen, paper, or glass cloth materials to form industrial laminates. Overall, industrial laminates are dense, strong and durable, moisture resistant, lightweight, and will not soften when heat is reapplied. Typically they have high mechanical and insulating properties.
Grade X, XX, and XXX Phenolics are made up of a mixture of phenolic resin and paper and are the lowest costing material in the phenolic family. This blend provides good mechanical properties, with each “X” designating different levels of dielectric strengths and mechanical properties. Grade X has excellent mechanical properties but is not recommended for applications where electrical properties are important and humidity is high, Grade XX is suitable for general electric insulation, and Grade XXX has excellent electrical insulating strength and does well in humid environments but has weaker mechanical properties. Paper based phenolics make a great choice for punch parts, insulating washers, spacers, terminal boards, switch bases, and other electrical components. It is available in plate, rod, and tube.
Grade X meets MIL-I-24768/12 TYPE PBM
Grade XX meets MIL-I-24768/11 TYPE PBG
Grade XXX meets MIL-I-24768/10 TYPE PBE
Application
- Punch parts
- Insulating washers
- Spacers
- Terminal boards
- Switch bases
- Electrical components
- Sleeves
- Panel boards
Properties
- Easy to machine
- Lowest cost of phenolics
- Good wear resistance
- Low moisture absorption
- Good mechanical strength
- Strong and stiff
- High impact and compressive strength
Physical |
Astm Test Method |
Paper |
Canvas |
Linen |
| Density (lb/in^3) | D792 | 0.049 | 0.05 | 0.048 |
| Specific Gravity | D792 | 1.35 | 1.37 | 1.34 |
| Water Absorption @ 24 hours (%) | D570 | 2 | 2.5 | 1.8 |
Mechanical |
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| Tensile Strength (PSI) Lengthwise, Crosswise | D638 | 15,000 and 12,000 | 11,000 and 9,000 | 13,000 and 9,000 |
| Flexural Strength (PSI) Lengthwise, Crosswise | D790 | 16,000 and 13,200 | 17,500 and 15,000 | 22,000 and 16,000 |
| Compressive Strength (PSI) | D695 | 32,000 | 37,000 | 37,000 |
| Flexural Modulus (KPSI) Lengthwise, Crosswise | D790 | 1,100.000 and 900.000 | 1,600,000 and 1,500,000 | 1,600,000 and 1,200,000 |
| Izod Impact (Notched), ft-lb/in Lengthwise, Crosswise | D256 | .65 and .60 | 1.70 and 1.50 | 1.35 and 1.10 |
| Rockwell Hardness | D785 | M100 | M100 | M110 |
Thermal |
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| Coefficient of Thermal Expansion, 10^-5/°F Lengthwise, Crosswise |
D696 | .80 and 1.20 | 1.10 and 1.22 | 1.00 and 1.060 |
| Continous Service Temp (Operating), °F | 257 | 257 | 285 | |
| Thermal Conductivity, BTU-in/hr-ft² °F | C177 | 2.03 | 2.03 | 2.03 |
| Flammability Rating | UL94 | HB | HB | HB |
Electrical |
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| Dielectric Strength, Short Term, (Volts/Mil) @ .125″ Thick |
D149 | 750 (XX) | 550 (CE) | 625 (LE) |
| Arc Resistance (sec) | D495 | 110 | 15 | 15 |
| Dielectric Constant at 1 MHz | D150 | 5 | 5 | 6 |
| Dissipation Factor at 1 MHz | D150 | 0.045 | 0.045 | – |
NOTE:
The information contained herein are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers' complete material property datasheets. All values at 73°F (23°C) unless otherwise noted.