First-hour yield: the KPI most glass plants do not measure

First-hour yield is the difference between a changeover you can be proud of and one that looks good on a report. Here's how to measure and improve it.

1 May 2026 6 min readLean Glass

Molten glass being formed at the hot end

What it is and why it matters

First-hour yield is the cleanest single measure of how well your forming, forehearth and line coordination handled a transition.

Want this lens on your plant?

Short, candid call with a senior practitioner. 30 minutes, no slides.

Book a hot-end audit Explore services