DEFSTAN 68-278/1(2007) : 2007

Foreword
1 Scope
2 Warning
3 Normative References
4 Cleaning Processes
   4.1 Oxygen clean
   4.2 Cleaning requirements
5 Cleanliness Limits
6 Verification of Cleanliness
7 Quality Control Procedures for Batches of Components
   7.2 Statistical Selection of samples
   7.3 Statistical Control Acceptance limits
8 Packaging And Labelling
   8.1 Introduction
   8.2 Cleanliness of packaging materials
   8.3 Packaging processes
   8.4 Use of desiccants
   8.5 Outer containers
   8.6 Labelling
   8.7 Unwrapping for use
9 Solvents and Cleaning Agents
10 Cleaning Agent Compatibility
   10.1 General
   10.2 Aluminium
   10.3 Rubber
   10.4 Plastic
Annex A Examples Of Cleaning Procedures
   A.1 General
        A.1.1 General guidelines
   A.2 Choice of Cleaning Method
   A.3 Cleaning Methods
        A.3.1 General
        A.3.2 Mechanical cleaning
              A.3.2.1 General
              A.3.2.2 Brushing and grinding
              A.3.2.3 Tumbling
              A.3.2.4 Pad application, spraying and immersion
              A.3.2.5 Vacuum and air blast cleaning
              A.3.2.6 Pig cleaning
              A.3.2.7 Ultrasonic cleaning
        A.3.3 Chemical cleaning
              A.3.3.1 General
              A.3.3.2 Hot water cleaning
              A.3.3.3 Detergent cleaning
              A.3.3.4 Steam cleaning
              A.3.3.5 Caustic solution cleaning
              A.3.3.6 Acid cleaning
              A.3.3.7 Emulsion cleaning
              A.3.3.8 Solvent cleaning
              A.3.3.9 Vapour phase degreasing
              A.3.3.10 Flushing
              A.3.3.11 Low-pressure plasma
   A.4 Environment and Assembly
Annex B Verification of Cleaning Procedures
   B.1 General
   B.2 Direct Visual Inspection Using White Light
   B.3 Direct Visual Inspection Using Ultraviolet or
        Black Light
   B.4 Inspection by Wiping Or Pigs
   B.5 Water Break Test
   B.6 Solvent Extraction Test
   B.7 Gaseous Entrainment/Gas Extraction Test
   B.8 Analysis by Instruments
   B.9 Light Scattering
   B.10 Light Attenuation
   B.11 Infra Red Absorption Spectroscopy

Provides guidance on cleaning procedures for components used in diving and marine oxygen systems; it does not apply to systems and components intended for aviation use.