MIL-STD-6866 Base Document:1985

1 Scope
1.1 Purpose
1.2 Application
1.3 Classification
1.3.1 Penetrant systems
1.3.2 Developers
1.3.3 Solvent removers
2 Referenced documents
2.1 Government documents
2.1.1 Specifications and standards
2.2 Other publications
2.3 Order of precedence
3 Definitions
3.1 Background
3.2 Black light
3.3 Black light filter
3.4 Bleedout
3.5 Component
3.6 Contaminant
3.7 Contracting agency
3.8 Dark adaptation
3.9 Defect
3.10 Developer
3.11 Developer, dry
3.12 Developer, nonaqueous
3.13 Developer, wet (aqueous) soluble
3.14 Developer, wet (aqueous) suspendible
3.15 Drain time
3.16 Drying oven
3.17 Dwell time
3.18 Emulsifier
3.19 Emulsifier, hydrophilic
3.20 Emulsifier, lipophilic
3.21 Etching
3.22 Evaluation
3.23 Fluorescence
3.24 Government procurement agency
3.25 Hydro-air nozzle
3.26 Indication
3.27 In-process
3.28 In-service
3.29 Inspection
3.30 Interpretation
3.31 Linear indication
3.32 NDT facility
3.33 Penetrant
3.34 Penetrant, post emulsifiable
3.35 Penetrant, solvent removable
3.36 Penetrant, water-washable
3.37 Postcleaning
3.38 Precleaning
3.39 Prime contractor
3.40 Relevant indication
3.41 Reprocess
3.42 Solvent remover
4 General requirements
4.1 Responsibility for inspection
4.2 Specifying
4.3 Personnel qualification
4.4 Materials
4.4.1 Qualified materials
4.4.2 LOX compatible materials
4.5 Equipment and facilities
4.5.1 Processing
4.5.2 Viewing
4.6 Written procedure
4.7 Inspection sequence
4.7.1 Surface treatment
4.7.2 Surface coatings
4.8 Materials and process limitations
4.9 Records
5 Specific requirements
5.1 Surface preparation
5.1.1 Solvent cleaning
5.1.2 Chemical cleaning
5.1.3 Mechanical cleaning
5.1.4 Etching
5.2 Penetrant application and dwell
5.3 Penetrant removal
5.3.1 Method A process
5.3.1.1 Manual spray
5.3.1.2 Automated spray
5.3.1.3 Manual wipe
5.3.2 Method B process
5.3.2.1 Lipophilic emulsifier application and dwell
5.3.2.2 Rinsing
5.3.3 Method C process
5.3.4 Method D process
5.3.4.1 Prerinse
5.3.4.2 Hydrophilic emulsifier application and dwell
5.3.4.3 Postrinse
5.4 Drying
5.4.1 Sequence
5.4.2 Drying parameters
5.5 Developing
5.5.1 Dry developers
5.5.2 Nonaqueous developers
5.5.3 Aqueous developers, soluble and suspendible
5.6 Inspection
5.6.1 Type I processes
5.6.2 Type II processes
5.6.3 Evaluation
5.6.3.1 Mechanical evaluation
5.7 Postcleaning
5.8 Quality assurance provisions
5.8.1 Black lights
5.8.2 White light
5.8.3 System performance
5.8.3.1 Known defect standards
5.8.4 Materials
5.8.4.1 Penetrants
5.8.4.1.1 Brightness
5.8.4.1.2 Water content (Method A penetrants only)
5.8.4.1.3 Removability (Method A penetrants only)
5.8.4.1.4 Sensitivity
5.8.4.2 Emulsifiers
5.8.4.2.1 Removability
5.8.4.2.2 Water content (lipophilic emulsifier)
5.8.4.2.3 Concentration (hydrophilic emulsifier)
5.8.4.3 Developers
5.8.4.3.1 Dry developer
5.8.4.3.2 Aqueous developer (soluble and suspended)
5.8.5 Inspection area
5.8.6 Operating pressures/temperatures
5.9 Marking
5.9.1 Impression stamping
5.9.2 Etching
5.9.3 Dyeing
5.9.4 Other identification
5.9.5 Symbols
6 Notes
6.1 Intended use
6.2 Nonmetallic components

Describes liquid penetrant inspection of non-porous, non-metal and metal components. Coverage includes referenced documents, definitions, materials, surface treatment, personnel qualifications, processing, surface treatment, records, inspection sequence, solvent cleaning, mechanical cleaning, dry developers, black lights, white lights, penetrant removal, and rinsing.

This standard establishes the minimum requirements for conducting liquid penetrant inspection of nonporous, metal and nonmetal components.