Glass microsphere
（重定向自Microballoon）
![SEM micrograph of a glass microsphere in concrete](/Images/godic/202501/27/Glass_microsphere_in_concrete3528.jpg")
Glass microspheres are microscopic spheres of glass manufactured for a wide variety of uses in research, medicine, consumer goods and various industries. Glass microspheres are usually between 1 and 1000 micrometers in diameter, although the sizes can range from 100 nanometers to 5 millimeters in diameter. Hollow glass microspheres, sometimes termed microballoons, or glass bubbles have diameters ranging from 10 to 300 micrometers.