Aluminum-oxide-hydroxide(AIOOH) is a clean and non-toxic flame retardant.There have been many trials for the fabrication of ultrafine AIOOH.Two main approaches exist for nano-AlOOH synthesis:reactive precipitation and batch hydrothermal synthesis.Both approaches are laborious and time consuming with poor control of particle morphology.We report on the novel continuous flow manufacture of AIOOH nanorods with controlled morphology(particle size and shape) by hydrothermal synthesis.AIOOH was harvested from its mother liquor(colloidal solution) using poly(acrylamide-co-acrylic acid) copolymer as a flocculating agent.The developed AIOOH shape and size,crystalline phase,thermal stability,and endothermic heat sink action were investigated by transmission electron microscopy,X-ray diffractometry,thermogravimetric analysis,and differential scanning calorimetry,respectively.The phase transition of AIOOH to AI_2O_3 was demonstrated by conducting different X-ray diffractometry scans from 400 to700 ℃.These results may provide an option for the continuous synthesis of nano-AlOOH as a clean and non-toxic flame retardant with excellent thermal stability.Consequently,enhanced flammability properties can be achieved at low solids loading. Aluminum-oxide-hydroxide (AIOOH) is a clean and non-toxic flame retardant. There have been many trials for the fabrication of ultrafine AIOOH.Two main approaches exist for nano-AlOOH synthesis: reactive precipitation and batch hydrothermal synthesis. laborious and time consuming with poor control of particle morphology. We report on the novel continuous flow manufacture of AIOOH nanorods with controlled morphology (particle size and shape) by hydrothermal synthesis. AIOOH was harvested from its mother liquor (colloidal solution) using poly -co-acrylic acid) copolymer as a flocculating agent. The developed AIOOH shape and size, crystalline phase, thermal stability, and endothermic heat sink action were investigated by transmission electron microscopy, X-ray diffractometry, thermogravimetric analysis, and differential scanning calorimetry, respectively. The phase transition of AIOOH to AI_2O_3 was demonstrated by conducting different X-ray diffractometry scans from 400 to 700 ° C. These results may provide an option for the continuous synthesis of nano-AlOOH as a clean and non-toxic flame retardant with excellent thermal stability. Conclusion, enhanced flammability properties can be achieved at low solids loading.