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【范围】
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1.1 Purpose
This specification establishes the classification, technical requirements, tests, and test procedures for the qualification,
approval, and quality verification of all materials used in the liquid penetrant methods of inspection with the exception of
those excluded in the application section.
1.1.1 The qualifying agency for direct U.S. Military procurement is the Materials and Manufacturing Directorate of the Air
Force Research Laboratory AFRL/MLSA, 2179 12th Street, Rm 122, Wright-Patterson Air Force Base, OH,
45433-7718, (937) 656-9151. AFRL/MLSA will maintain the qualified products list for military procurement of
penetrant materials, replacing QPL-25135, and will audit and approve other testing facilities to perform all or
portions of the tests contained herein.
1.2 Application
This specification is applicable to penetrant materials used in manufacturing and maintenance operations. It is intended to
be used by prime contractors in establishing an approved products list (QPL) for use by themselves and their suppliers. It
does not cover such special application products as liquid oxygen compatible, high or low temperatures, thixotropic,
reverse fluorescent, and dye precipitation penetrant systems.
1.3 Safety - Hazardous Materials
While the materials, methods, applications, and processes described or referenced in this specification may involve the
use of hazardous materials, this specification does not address the hazards which may be involved in such use. It is the
sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and to take
necessary precautionary measures to ensure the health and safety of all personnel involved.
1.4 Classification
Penetrant systems covered by this specification are to be classified as follows:
1.4.1 Penetrants shall be of the following types, methods, and sensitivity levels:
Type 1 Fluorescent Dye
Type 2 Visible Dye
Method A Water washable
Method B Post emulsifiable, lipophilic
Method C Solvent removable
Method D Post emulsifiable, hydrophilic
Sensitivity level 1/2 Ultra low
Sensitivity level 1 Low
Sensitivity level 2 Medium
Sensitivity level 3 High
Sensitivity level 4 Ultra high
1.4.1.1 Sensitivity level 1/2 applies to Type 1, Method A penetrants only. There is no sensitivity level classification for
Type 2 penetrant systems.
1.4.2 Developers shall be of the following forms:
Form a Dry powder
Form b Water soluble
Form c Water suspendible
Form d Nonaqueous Type 1 Fluorescent (solvent based)
Form e Nonaqueous Type 2 Visible Dye (solvent based)
Form f Special Application
1.4.3 Solvent Removers shall be of the following classes:
Class 1 Halogenated
Class 2 Nonhalogenated
Class 3 Special applicationstrRefField
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