42 Analysis of water quality; Chemical analysis; Chemical research services; Design, engineering, research, development and testing services in the field of polymeric materials, polymer synthesis, and materials customization for medical, scientific, and technological applications; Materials testing and analysing; Research and development in the field of photovoltaic solar energy; Scientific and technological services, namely, scientific research, analysis, testing in the field of resin in environmental protection, metallurgy and lithium absorbent in the field of lithium extraction from salt lakes; Testing of materials; Working on and evaluation of chemical analyses; Working on and evaluation of chemical syntheses