This standard specifies the requirements, test methods, inspection rules and markings, packaging, transportation, storage, quality certificates, contracts (or order orders) and safety requirements for high-purity tellurium dioxide. This standard applies to high-purity tellurium dioxide produced using 5N tellurium as raw material, which can be used to prepare tellurium dioxide single crystals, electronic component materials, infrared devices and infrared window materials, optical fiber amplifiers, etc.