The secondary research process involved comprehensive analysis of regulatory databases, industry publications, trade association reports, and authoritative chemical & materials organizations. Key sources included the US Environmental Protection Agency (EPA), Occupational Safety and Health Administration (OSHA), European Chemicals Agency (ECHA), Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH) Database, American Chemistry Council (ACC), Plastics Industry Association (PLASTICS), European Plastics Association (Plastics Europe), Society of Plastics Engineers (SPE), American Composites Manufacturers Association (ACMA), US Census Bureau – Manufacturing & Construction Statistics, Eurostat – Industrial Production & Trade Database, National Institute of Standards and Technology (NIST), International Organization for Standardization (ISO) – Plastics Standards, ASTM International – D20 Plastics Committee, US Bureau of Labor Statistics (BLS), Organisation for Economic Co-operation and Development (OECD) – Chemicals Production Data, United Nations Industrial Development Organization (UNIDO), World Trade Organization (WTO) – Trade Statistics, International Trade Centre (ITC), and national statistical offices from key markets (China National Bureau of Statistics, Japan Ministry of Economy, Trade and Industry, India Ministry of Chemicals and Fertilizers). These sources were used to collect production capacity data, regulatory compliance frameworks, safety & handling standards, trade flow analysis, raw material pricing trends (MMA, PMMA), and market landscape analysis for extruded acrylic sheets, cast acrylic sheets, and their applications across construction & architecture, healthcare & medical, hospitality, retail, automotive & transportation, food & beverages, electrical & electronics, and sanitary ware.