Quality inspection


Products of DDO-Strichplatten und Dünnschicht GmbH periodical come under detailed quality inspection before delivery. By default this inspection contains - depending on each product - test criteria like:

  • Graduation and tolerances according to technical drawing (on the basis of a sampling inspection after DIN 2859 and ISO 3951 or after customised inspection arrangement)
  • Line widths, lettering, numbers and distances
  • Centring accuracy
  • Interval accuracy
  • Mechanical dimensions and tolerances
  • Material specification respectively surface specification according to customer requirement / drawing
  • Reflection / transmission / absorption under different angles of incidence and polarizing directions (according to drawing or customer requirement)

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