Physical/Engineering technical properties

Physical and chemical property standard have certain good physical and chemical properties and have been accurately measured. They are used for calibration of physical and chemical property measuring instruments or evaluation of measurement methods, such as pH, calorific value, polymer molecular weight standard, etc. Engineering and technical property standard have certain good technical properties and have been accurately measured. They are used for calibration of engineering and technical parameters and property measuring instruments, evaluation of measurement methods, and comparative measurement of material or product technical parameters, such as particle size standard, standard rubber, standard photosensitive fading paper, etc.