ACADEMY SERIES · EPISODE 17Glass Industry

Humidity Control in Glass Lamination

In laminated glass, how well the PVB interlayer bonds to the glass is often decided by the air in the production room; film moisture of about 0.4% at 30% relative humidity exceeds 2% at 80%. This episode covers the moisture balance of PVB film, the pummel test, lay-up room conditions, the dew point target of around 0 °C and why silica gel rotor dehumidification is needed to reach it.

Published: 8 October 2026Narration: Turkish and English6:26

In this video

  • The room's relative humidity sets the moisture of the PVB interlayer: film moisture is about 0.4% at 30% RH but exceeds 2% at 80%, while manufacturers recommend about 0.4–0.5% for lamination.
  • Film that is too moist leads to bubbles, edge separation and haze; film that is too dry leads to excessive adhesion, brittleness under impact and static. The aim is to hold humidity steady within a narrow band.
  • Adhesion is scored from 0 to 10 with the pummel test; architectural glass usually targets 3–7, and steady room humidity means a steady pummel value.
  • The most common lay-up room condition is 18–20 °C and 25–30% RH; its dew point of about −2 to +2 °C lies outside the practical limit of condensing units.
  • A silica gel rotor unit works comfortably at this dew point; a cooling coil ahead of the rotor takes the summer load economically, and steam or gas reactivation typically cuts operating costs by 40–60%.

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