As Pilkington marks 200 years since its founding, recent trials with hydrogen and biofuels in float glass production—and the rollout of lower-embodied-carbon products—signal where architectural glazing specifications are headed. Here's what specifiers should know about the decarbonization push reshaping the supply chain.
A Bicentennial That Doubles as an Industry Inflection Point
The architectural glass industry has spent the better part of a century perfecting performance—from continuous curtain walls on International Style towers to the ultra-high-performance envelopes specified in today's energy-code-driven projects. But the next chapter is being written around a different metric: embodied carbon.
That shift came into sharper focus this week with ArchDaily's coverage of Pilkington's 200th anniversary. The piece traces a long arc of innovation, but the most consequential developments for current spec writers are recent. In 2026, Pilkington marks 200 years since it was founded in northwest England, a milestone that reflects its long-standing influence on the development of architectural glass. More importantly, the company's recent R&D activity points to where flat-glass manufacturing as a whole is headed.
Hydrogen, Biofuels, and the Float Furnace
Float glass production is energy-intensive by nature—molten glass on a tin bath at temperatures that demand enormous thermal input. Decarbonizing that process has been one of the harder problems in building product manufacturing.
If innovation in architectural glass during the twentieth century was largely focused on building performance, the twenty-first century has introduced a new challenge: reducing the carbon emissions associated with its production. In 2021, Pilkington conducted a pioneering trial using hydrogen as a fuel in float glass manufacturing, considered the first experiment of its kind in the industry. The following year, in 2022, the company also carried out a biofuel trial, exploring alternative energy sources capable of reducing emissions associated with the melting process.
These aren't commercial-scale rollouts yet, but they validate pathways that EPD-conscious owners and design teams have been demanding. Expect competing float manufacturers to follow.
Lower-Embodied-Carbon Product Lines Are Already Specifiable
The story doesn't stop at fuel switching. Material composition and recycled content are equally important levers.
New generations of products have aimed to lower the embodied carbon of the material itself. In 2023, Pilkington Mirai was introduced, an architectural glass with approximately 52% less embodied carbon compared to conventional float glass. This reduction results from a combination of renewable energy, higher recycled glass content, and alternative fuels used during manufacturing.
A roughly 50% reduction in embodied carbon at the float level is significant when glass typically represents one of the larger embodied-carbon line items in a curtain-wall or window-wall assembly. For projects pursuing LEED v5, ILFI Zero Carbon, or jurisdictions with Buy Clean procurement requirements, these products give specifiers a real lever to pull without compromising thermal or optical performance.
Practical Implications for Architects, GCs, and Manufacturers
The decarbonization push has tangible consequences across the project delivery chain:
- For architects and specifiers: EPDs and embodied-carbon data are moving from "nice to have" to baseline submittal documentation. When writing performance specs, consider adding maximum embodied-carbon thresholds for glazing alongside U-factor, SHGC, and VLT requirements.
- For glazing contractors: Expect more owner-driven requests for low-carbon glass substitutions during VE and submittal review. Understanding which fabricators have access to lower-carbon float supply will become a competitive differentiator.
- For curtain wall and window manufacturers: Pairing low-carbon float with high-performance coatings and warm-edge IGU components produces a compelling sustainability story. The companies that align supply chains around verified-low-carbon glass will win on increasingly common ESG-driven procurement criteria.
- For owners and developers: Local Law 97-style carbon caps focus on operational emissions today, but embodied-carbon regulation is following close behind in jurisdictions like New York, California, and Washington. Specifying low-embodied-carbon glass now hedges against future compliance costs.
The Bigger Picture: Glass as a Systems Material
From the continuous curtain walls of International Style office towers to the high-performance envelopes of contemporary architecture, the material has become ubiquitous. This widespread use has been accompanied by continuous innovation in manufacturing, expanding architectural possibilities and influencing not only the appearance of buildings but also their energy performance and environmental impact.
That trajectory—from aesthetic enabler to performance driver to carbon-accountable system—reframes how building envelope professionals should approach glass selection. The float industry's pivot toward hydrogen, biofuels, and high-recycled-content products isn't a marketing exercise. It's the leading edge of a procurement reality that will define commercial glazing specifications for the next decade.
For project teams currently scoping 2026 and 2027 facades, the question is no longer whether low-carbon glass options exist—they do, and they're ready to spec. The question is whether your specifications, submittals, and supply-chain due diligence are keeping up.