This Environmental Product Declaration covers the ceramic masonry blocks product ranges manufactured by LEIER ROM S.R.L. exclusively within its designated production plant in Sighisoara, Mures County. The Leier ceramic masonry line consists of various ceramic blocks designed for both structural and non-structural masonry applications, defined by a hollow core configuration engineered to optimize structural and thermal efficiency. As the raw clay mix, manufacturing methodology, and essential raw materials are standardized across the designated production line—the environmental impact results are presented for 1 ton (1,000 kg) of finished product. Additionally, the Annex to this EPD presents the specific GWP (Global Warming Potential) values obtained individually for each of the manufacturing configurations. Technical Characteristic,Value / Property,Reference Standard Ceramic Masonry Units,Ranges for structural and non-structural masonry,SR EN 771-1+A1:2015 Reaction to Fire,Euroclass A1,SR EN 771-1+A1:2015 Compressive Strength,Variable (depending on product configuration),SR EN 771-1+A1:2015 Net Dry Density,Variable (depending on product configuration),SR EN 771-1+A1:2015 Thermal Conductivity,Variable (depending on product configuration),SR EN 771-1+A1:2015 Water Vapor Permeability,5 / 10,SR EN 771-1+A1:2015 Construction and Materials Leier ceramic blocks are engineered using specialized, optimized clay mixtures and burning processes to establish a highly durable, structurally stable, and thermally efficient configuration: Fired Clay Core Matrix: Formulated from natural clay reserves and burned at high industrial temperatures to guarantee excellent mechanical load-bearing resistance, dimensional stability, and prolonged service longevity. Optimized Perforation Geometry: Designed with variable internal volumes of hollow cavities to secure structural lightweight properties while maximizing thermal and acoustic resistance according to specific application requirements. Manufacturing and Sustainability Operating under standardized, high-performance industrial procedures, the manufacturing process relies on natural, mineral-based raw materials, utilizing high-temperature firing processes that establish a chemically stable, inert, and ecological material profile. Product Benefits Optimized Thermal Performance: Due to the natural insulating properties of fired clay coupled with an advanced hollow core geometry, the blocks effectively maintain constant indoor living environments, lowering seasonal heating or cooling resource consumption and saving associated energy expenditures. Microclimate & Health Safety: Burned at extreme temperatures achieve Euroclass A1 reaction to fire without emitting any toxic smoke or gases during fire exposure, and exhibit a safe mineral profile that respects surrounding air and water quality. Longevity & Circular Economy: The structural durability and atmospheric wear resistance ensure that the masonry elements maintain structural stability over decades. At the end of the building life cycle, the masonry elements can be completely crushed, recycled, and diverted back into secondary industrial loops, preserving natural mineral reserves. Precision & Execution Efficiency: Manufactured to strict dimensional tolerances, these masonry units allow for rapid interlocking alignments, significantly reduced mortar mix consumption, short on-site construction times, and cleaner structural jobsites.