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Resistance to Oil: Insulation and Sheath

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$740
FED-STD-228 Method 4221
Chemical
Insulation
Inquire Directly
Quantity discounts available.

This method is intended for use in determining the effect of oil on oil-resisting insulation and sheath of insulated wire and cable. The procedure may be used for determining the resistance of insulation and sheath to oil at any desired temperature. The tensile strength and elongation, or other characteristic used for determining the degree of deterioration is determined immediately after exposure of the material.

The pass/fail criteria are defined by the individual wire specification. This test is often included as part of comparative testing to determine if there is a performance gain with a new wire/cable product.

The following properties can be changed with this test method:

  • Number of specimen tested
  • Exposure fluid
  • Exposure temperature
  • Exposure mechanical and/or electrical stresses
  • Post-exposure assessment methods
Our Process
1
Perform visual examination of the specimen. Record any observed defects.
2
Unless otherwise specified in the detail specification, the test shall be carried out at a temperature of 121 degrees Celsius for a period of 18 hours.
3
Place the specimen into the liquid for the specified exposure duration.
4
At the end of the immersion period, the specimen shall be removed, placed immediately in a fresh supply of the same liquid at room temperature and allowed to remain for 35 minutes.
5
At the end of the cooling period, the specimen is cleaned, dried, and subjected to tensile strength and elongation test.
6
Perform tensile strength and elongation tests on unaged specimen.
7
Report the number of specimens tested, elevated exposure conditions, and results of post-exposure assessments.