Non-Metallic Material Characteristics

Acetal

Transparent white

  • Good electrical properties (400-465 v/mil)
  • High mechanical properties & rigidity
  • Fatigue, moisture, gasoline & solvent resistant
  • Cannot resist: steam, hot water or strong bases
  • Good cold flow resistance

Fibre

Provided in any of the following colors: Red, Gray, Black

  • Extensively used for electrical insulation applications where little moisture is present (150-250 v/mil)
  • Fair mechanical properties
  • Can be formed
  • Good cold flow resistance
  • Non-magnetic & corrosion resistant
  • Good thermal conductivity (.25 BTU/hr/ft2/°F/ft)

Fiberglass

Fiberglass

  • Laminate of layers of fiberglass mesh with different impregnated resins for different based properties

G–7, Silicone resin

  • Best heat resistance

G–9, Heat resistant Melamine resin

  • Best mechanical properties of non-metallics
  • Good electrical insulator particularly under wet conditions (350 v/mil)
  • Good dimensional stability
  • Good thermal conductivity for a non-metallic (.29 BTU/hr/ft2/°F/ft)

G–10, Epoxy resin

  • Good dimensional stability
  • High mechanical strength at room temperature
  • Good electrical insulator even in humid conditions (400 v/mil)

G–11, Heat resistant epoxy resin

  • Same properties as G-10 at room temperature
  • Retains 50% of room temperature standard flexural strength when measured at 150°C after 1 hour at 150°C

Kapton®

Red-brown to yellow-orange

  • DuPont® trade name for polyimide plastic film
  • Excellent electrical properties (i.e. 7000 v/mil)
  • Tensile strength—good(25,000 psi)
  • Ability to tolerate fairly high temperature (750°F)
  • Flexible—will not chip, flake or disintigrate under compression loads or in vibratory situations as does Mics
  • Indicator applications

Mica

Clear to light brown

  • Excellent electrical properties (3,000-6,000 v/mil)
  • High heat resistance—1050°F
  • Insulating material
  • It can chip, flake & disintigrate under compression loads & vibratory situations
  • Does not lend itself to automated production methods

Mylar®

Translucent
  • Extremely good electrical properties (4,000 v/mil)
  • Insulating material
  • Maximum thickness—0.014
  • Less expensive alternate to Kapton for lower temperature applications (300°F)

Neoprene

Black synthetic rubber, 60 shore hardness

  • Resilient—tear resistant
  • Cushioning properties—gaskets
  • Aircraft applications grade
  • Good oil resistance
  • Excellent abrasion & flame resistance
  • Excellent sealing capabilities

Nylatron®

Charcoal gray

  • Polymer Corp. trade name for molybdenum disulfide filled nylon
  • Electrical properties lessened slightly by the molybdenum disulfide (356 v.mil)
  • Increased resistance to cold flow and greater bearing qualities as compared to nylon

Nylon

Opaque white

  • Good electrical grade material (385 v/mil)
  • Good bearing properties
  • Good anti-frictional properties
  • High strength for a non-metallic
  • Self-extinguishing—flammability reading of 94V2
  • Fair cold flow properties

PCTFE

Transparent

  • Electrical grade plastic
  • Good insulator
  • Expensive
  • Due to small sheet size, does not lend itself to automated production methods

Phenolics

XXXP

  • Paper based with phenolformaldehyde resin impregnated
  • Best moisture resistance for phenolics (0.8%)
  • Low dielectric losses under severe humidity conditions
  • Good electrical properties (325 v/mil)
  • Less expensive than LE & CE, although more difficult to fabricate

LE

  • Fine weave cotton cloth impregnated with phenolformaldehyde resin
  • Good electrical properties (225 v/mil)
  • Good moisture resistance (1.3%)
  • Better machining properties & appearance than CE
  • Easiest phenolic to fabricate
  • Not good for primary insulation
  • Good mechanical properties

CE

  • Coarser weave cottom cloth impregnated with phenolformaldehyde resin
  • Best mechanical properties of phenolics
  • Good moisture resistance (1.6%)
  • Good electrical properties (225 v/mil)
  • Not good for primary insulation

Nylon, brown

  • Nylon fabric impregnated with phenolformaldehyde resin
  • All purpose electrical grade
  • Good for operating temp. below 160°F

Polyethylene

Translucent white

  • Common plastic—quite inexpensive
  • Good electric insulator (460 v/mil)
  • Good sealing capabilities
  • Low water absorption rate (0.015%)

Polyurethane

  • Stable in harsh environments
  • Hard as a bowling ball or as soft as a marshmallow
  • Resistant to abrasion
  • High load-bearing capacity
  • Highly resistant to impact
  • Ideal for high flex applications
  • A wide resilience range
  • Available in high and low friction formulations
  • Bonds to metal, wood and most plastics

PTFE

Provided in any of the following colors: White, Blue

  • Excellent anti-frictional properties
  • Good electrical properties (480 v/mil)
  • Excellent chemical & corrosion resistance
  • High heat resistance (500°F)
  • Fair cold flow properties
  • Very lw water absorption rate (0.005%)
  • Excellent for low temperature applications
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