APPLICATION OF DATAMATRIX IDENTIFICATION SYMBOLS TO AEROSPACE PARTS USING DIRECT PART MARKING METHODS/TECHNIQUES
|Publication Date:||20 February 2016|
This handbook provides detailed guidance for using permanent direct part marking (DPM) methods and techniques to apply Data Matrix identification symbols safely to products. This handbook addresses symbol structure only as it relates to marking and reading limitations. Technical specifications related to the Data Matrix symbol are found in Automated Identification Manufacturers (AIM) International Incorporated technical specification, International Symbology Specification - Data Matrix. Overall program/project requirements on the use of the Data Matrix symbol, including symbol criteria, marking method selection, surface preparation, and protective coating locations, and readability standards are contained in NASA-STD-6002, Applying Data Matrix Identification Symbols on Aerospace Parts.
The purpose of this document is to provide information supplementing NASA Standard 6002 regarding the format of dot matrix codes and means for applying them to surfaces.
This handbook is applicable to engineering practices for applying Data Matrix identification symbols to parts used in NASA programs/projects using DPM methods and techniques.
This handbook may be referenced in contract, program, and other Agency documents for guidance. Individual portions of this handbook may be tailored (i.e., modified or deleted) by contract or program specifications to meet specific program/project needs and constraints. Tailoring must be formally documented and approved as part of program/project requirements.
This handbook is to be used in new programs as well as those that are currently in the design phase. Retrofit marking for hardware on existing programs is encouraged where feasible. The portions of this document addressing the application of human-readable identification (HRI) markings do not apply to retrofit marking programs. Materials degradation and hazard analyses are conducted in NASA programs when it is assumed that a single HRI marking is to be applied to each product. The application of an additional Data Matrix marking to these parts should be reviewed to ensure that product integrity is not compromised.
Environmental, health, and safety impacts in processes and materials should be considered in employing identification marking methods and techniques. Alternative "environmentally friendly" materials that contain low/no volatile organic compounds (VOCs) should be considered in determining the appropriate method/technique for marking. VOCs are found in many types of ink, such as methyl ethyl ketone, xylene, and toluene, which are principal components in atmospheric reactions that form ozone and other photochemical oxidants. Exposures to VOC-containing materials have health impacts, including eye and respiratory irritation, headache, dizziness, memory impairment, neurotoxicity, and cancer.