To specify the location and buildup dimensions of the microfilm carrier and the location and dimensions of the aperture. Product media are an 80-column tabulating card and a non-tabulating A6 aperture card. The aperture sizes are designated Tab C, Tab D, Tab E, and Tab F. The Tab D size is most commonly used.
The intent of this standard is to help those who manufacture cards, process cards or use processed cards. This standard provides:
- card classification
- card paper requirements
- card sizes
- microfilm carrier construction methods
- card handling precautions