LE PHENOLIC (LINEN BASE / PHENOLIC RESIN)

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)

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

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

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

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.