Silica & Glass Briefing, 4 September 2026: Stoelzle Rebuilds Monaca as Vetropack Dismantles St-Prex
Two container-glass furnace decisions defined the week and point in opposite directions: Stoelzle took its Monaca, Pennsylvania furnace down for a $100M rebuild returning it 80 % larger, while Vetropack finished dismantling furnace 21 at St-Prex, permanently removing that capacity from Europe.
Stoelzle Glass USA laid off about 200 of roughly 400 workers at Monaca, Pennsylvania — temporary, tied to a $100M rebuild taking the furnace to 400 t/day, 80 % larger and 25 % more energy efficient, with recall promised by 1 February.
Vetropack finished dismantling furnace 21 at St-Prex, Switzerland, redistributing about 8,000 t of cullet and quartz sand to other Vetropack plants and external partners across roughly 300 shipments.
Pilkington UK confirmed a 15,000 tCO₂e per year saving at Greengate Works, St Helens, achieved by consolidating rolled and float production onto a single furnace with £3.7M of Industrial Energy Transformation Fund support.
Markets & Prices
Stoelzle Glass USA laid off about 200 of its roughly 400 workers at Monaca, Pennsylvania. The layoffs are temporary and tied to a $100M plant upgrade rebuilding the furnace to 400 t/day — 80 % larger and 25 % more energy efficient — with recall promised by 1 February.
Vetropack finished dismantling furnace 21 at St-Prex, Switzerland, removing that capacity from the European container market. About 8,000 t of cullet and quartz sand were redistributed to other Vetropack plants and to external partners across roughly 300 shipments.
O-I Glass is modernising its Muskogee, Oklahoma plant — furnaces, production equipment, controls and safety technology — backed by an Oklahoma Business Expansion Incentive award of $2M and supporting about 200 jobs.
No fresh silica sand price prints surfaced this week — only vendor market-report pages, with no dated market commentary. The two capacity events above are the week's real supply signal.
Technology & Innovation
Fraunhofer ISE and the University of Freiburg produced semi-transparent organic photovoltaic modules on an industry-ready line: 14.5 × 14.5 cm modules at 9.26 % efficiency with 43.2 % visible-light transmittance. Every layer was applied by slot-die coating plus sputtering rather than lab hand-processing, and flexible film versions retained 100 % of their efficiency after 1,274 bending cycles — relevant to building-integrated glazing.
Michigan Technological University presented the first durability results for vacuum insulated glass at the FGIA conference.
Glass Technology Services opened an innovation hub in Sheffield, offering flexible workspace alongside specialist glass equipment and expertise for spin-outs and researchers.
Kuraray will present new laminated glass performance research at glasstec 2026, targeting a long-standing design problem.
Regulation & Sustainability
Pilkington UK confirmed a saving of 15,000 tCO₂e a year at Greengate Works, St Helens, achieved by consolidating rolled and float production onto a single furnace after Watson Street Works closed, with £3.7M of Industrial Energy Transformation Fund support.
CircuClarity Two published a two-year circularity assessment ahead of its October conference at glasstec. First built projects using reused glass and façade components now exist and take-back schemes are live, but scaling is blocked on transparent data and common standards.
Satinal secured a Global EPD for its STRATO EVA interlayer and solar encapsulants.
Silicosis: nothing new landed inside the window. The active thread remains Cal/OSHA's emergency silica advisory process toward an engineered-stone ban, plus the NEJM Evidence study on California fabricator silicosis published 12 August — worth watching, but not this week's news.
Companies & Projects
Forel North America moved its Canadian operations into a larger facility in Vaughan, Ontario, effective 1 September.
Şişecam is showing automotive replacement glass and related technologies at Automechanika, alongside its GlassBuild America presence.
Vitro Architectural Glass relaunched its Glass Education Center.
IWFA named Christina Horsley to lead the association, succeeding Darrell Smith after 30 years.
Just outside the window but worth noting: AGC Glass Europe is upgrading the magnetron coater at Lodelinsart, Belgium (24 August), and Vetropack reported first-half profit down 51 % year on year (21 August) — context for the St-Prex furnace decision.