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Insulation Concentricity and Wall Thickness

Mechanical FOR: Wire $920

Measuring the insulation concentricity and wall thickness is a quality assurance test that can identify uniformity issues. Wires with non-uniform insulation (or cables with non-uniform jackets) will have an unbalanced insulation wall thickness that can make the wire/cable more susceptible to mechanical or electrical failure. This test can be performed on wire gauges ranging from 30AWG to 0000AWG and on wholly tape wrapped and extruded constructions.

Procedure

  1. Perform visual examination of the specimen. Record any observed defects.
  2. Perform a cross section cut of the wire.
  3. Take cross section photo of wire.
  4. Measure minimum wall thickness.
  5. Measure maximum wall thickness.
  6. Report the ratio of minimum to maximum wall thickness.

Covered specifications

  • ANSI/ NEMA WC27500
  • AS23053 Method 5.3.4
  • AS4373 Method 101
  • AS22759 Method 5.5.5
  • AS85485 Method 4.7.5
  • AS81044 Method 4.7.5.10
  • ASTM D3032 Method 16
  • ASTM D374
  • J1128 Method 5.4
  • MIL-DTL-24643C Method 4.7.1
  • MIL-DTL-25038 Method 4.6.2
  • MIL-W-81822 Method 4.6.13
  • NEMA WC 57 Method 6.11
  • ISO 6722 Method 5.2
  • AS23053 Rev A Method 5.03.4
  • AS81044 Method 4.7.5.9
  • ASTM D3032 Method 15
  • ICEA S-81-570 Method 3.2
  • IS 10810 Method 6
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