LE PHENOLIC (LINEN BASE / PHENOLIC RESIN)
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 LE Phenolic is a high-density mixture of phenolic resin and fine weave cotton cloth fabrics. This blend makes Grade LE Phenolic more machinable for intricate details than Grade C and CE Phenolic. Grade LE Phenolic also has superior moisture resistance to Grade L, C, and CE Phenolic, which gives it the best electrical properties of the cotton grade industrial laminates. This makes it a good insulator for a number of applications. The ability to resist moisture also makes it ideal for use in humid environments. Grade LE Phenolic is available in plate, rod, and tube.
LE Phenolic meets MIL-I-24768/13 TYPE FBE
Application
- Fine gears and pinions
- Relay bases
- Radio parts
- Terminal bases
- Terminal strips
- Intricate machined parts
- Radio components
- Spacers
- Bushings
- Rollers
Properties
- Easy to machine
- High density
- Low moisture absorption
- Excellent electrical properties
- Low cost
- Good wear resistance
- Good mechanical strength
- Strong and stiff
- High impact and compressive strength
- Excellent moldability/stability
- Good chemical resistance
Typical Properties of Phenolic Laminates (Sheet Form) |
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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.