Building Materials Manufacturing worked example

Glass Defect Rate at 3.45% maximum allowed glass defect rate: a worked example

What does the result look like when maximum allowed glass defect rate reaches 3.45%? The full calculation is worked below with real intermediate numbers. a glass plant needs to quantify defects found during inspection, cutting, forming, or packing

The inputs for this scenario

  • Defective glass lites, containers, or tons found: 35 defects or tons (unchanged)
  • Total glass inspected in the same period: 1,000 lites, containers, or tons (unchanged)
  • Maximum allowed glass defect rate: 3.45 % (raised for this scenario; the documented default is 3)

Working through the calculation

  • Applying the documented formula (Glass Defect Rate = defective glass lites, containers, or tons found ÷ total glass inspected in the same period × 100) to the inputs above produces each figure below.
  • At this operating point the engine returns 3.5 % defect rate for glass defect rate, the number this scenario is built around.
  • At this operating point the engine returns -0.05 points for glass defect rate gap to target.
  • At this operating point the engine returns 35 count for defective glass lites, containers, or tons found.
  • At this operating point the engine returns 1,000 count for total glass inspected in the same period.

How this compares with the baseline

  • Against the tool's baseline example, where maximum allowed glass defect rate sits at 3% and the headline result is 3.5 % defect rate, this scenario lands almost exactly on the baseline at 3.5 % defect rate.
  • A figure at this level is achievable when maximum allowed glass defect rate is genuinely sustained, not just peaked for a shift. A single overall rate hides defect type and severity — a small number of critical stones or inclusions can matter far more than many cosmetic surface marks counted equally.

Results at a glance

  • Glass Defect Rate: 3.5 % defect rate (headline result)
  • Glass Defect Rate gap to target: -0.05 points
  • Defective glass lites, containers, or tons found: 35 count
  • Total glass inspected in the same period: 1,000 count

Run it with your numbers

  • Every input above is editable in the live Glass Defect Rate calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.