MIL-PRF-22097J
NATIONAL CONFERENCE OF STANDARDS LABORATORIES (NCSL)
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Laboratories, Calibration, and Measuring and Test Equipment.
(Copies of this document are available from https://www.ncsli.org/ or from the National Conference of Standards
Laboratories (NCSL) International, 1800 30th Street, Suite 305, Boulder, CO 80301-1026.)
2.4 Order of precedence. In event of a conflict between the text of this document and the references cited herein,
the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and
regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with the
applicable specification sheet. In the event of any conflict between the requirements of this specification and the
specification sheet, the latter shall govern (see 6.2).
3.2 Qualification. Resistors furnished under this specification shall be products which are authorized by the
qualifying activity for listing on the applicable qualified products list at the time of award of contract (see 4.4 and 6.3).
3.3 Material. The material shall be specified herein. However, when a definite material is not specified, a material
shall be used which will enable the resistors to meet the performance requirements of this specification. Acceptance
or approval of any constituent material shall not be construed as a guaranty of the acceptance of the finish product.
3.3.1 Plastic. Plastic laminates containing a cotton fabric base or plastic molding compounds containing a cotton
or wood flour filler shall not be used. When not machined, plastic material shall have smooth, or polished surfaces.
Surfaces that have not been sawed, cut, punched, or otherwise machined shall be smooth as practicable in
accordance with good manufacturing practice.
3.3.2 Ferrous metals. Unless specifically approved by the Government, the use of ferrous material, with the
exception of corrosion resistant steel and the resistance element material is prohibited.
3.4 Interface and physical dimension requirements. The resistors shall meet the interface and physical
dimensions specified (see 3.1).
3.4.1 Resistance element. The resistance element shall be nonwirewound on a form which shall not char or break
down as a result of the tests specified herein. The element shall be characterized by a continuous nature of the
surface area or multiple paths of the resistance element to be contacted. Contact must be made over a continuous
and unbroken resistance path.
3.4.2 Protective housing or enclosure. The resistance element of completed resistors shall be protected by a
housing, or an enclosure, or both, which shall completely cover the exterior of the resistance element. The protective
housing or enclosure shall be free from holes, fissures, chips, or other faults, and shall be such as to minimize the
established of leakage paths between terminals, resulting from collection of moisture film on the exterior surface of
the housing or enclosure. If housing is made from aluminum alloy, it shall be properly protected against corrosion
and all fasteners shall be plated. Unplated copper alloys metals shall not be used in contact with aluminum.
3.4.3 Terminals. Terminals shall be as specified in table III. All terminals shall be fastened securely. Terminals
shall be protected by a corrosion resistant metallic coating, and all terminals or exposed portions of insulated wire
shall be treated to facilitate soldering.
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