X, XX, XXX PHENOLIC (PAPER BASED)

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

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.