The secondary research process involved comprehensive analysis of regulatory databases, industry publications, chemical safety databases, and authoritative geological and industrial organizations. Key sources included the US Geological Survey (USGS) Mineral Commodity Summaries, European Chemicals Agency (ECHA), US Environmental Protection Agency (EPA), Occupational Safety and Health Administration (OSHA), National Institute of Standards and Technology (NIST), International Agency for Research on Cancer (IARC), World Health Organization (WHO) Chemical Safety Reports, China Ministry of Natural Resources, British Geological Survey (BGS), Australian Bureau of Statistics (ABS) - Mineral Resources, EU Eurostat Industrial Production Database, International Trade Centre (ITC) Trade Map, United Nations Comtrade Database, National Institutes of Health (NIH) toxicology databases, CDC Agency for Toxic Substances and Disease Registry (ATSDR), and national mining ministry reports from key producing regions including China, Mexico, Spain, and Turkey. These sources were used to collect mineral reserve statistics, production capacity data, regulatory compliance frameworks, import/export trade flows, and safety assessments for strontium carbonate, strontium sulfate, strontium nitrate, and strontium chlorates across electrical & electronics, paints & coatings, personal care, pyrotechnic, and refining applications.