Hollow glass microspheres ("HOLLOW GLASS MICROSPHERES POWDERs"), also referred to as "glass bubbles," are balloon-like glass structures having a median diameter of fewer than 500 micrometers. HOLLOW GLASS MICROSPHERES POWDERs are currently made using a process where a milled glass powder (or "glass frit") that contains a suitable blowing agent is flame-heated to temperatures at which the glass begins to soften. At these temperatures, the blowing agent either becomes or produces a gas, causing the glass powder to expand and form the HOLLOW GLASS MICROSPHERES POWDERs. HOLLOW GLASS MICROSPHERES POWDER can be made very strong to avoid being crushed or broken during further processing— i.e., mixing, spraying, kneading, molding, extrusion, and the like. Their strength is commonly measured as isostatic collapse strength, representing the value at which 80% of the HOLLOW GLASS MICROSPHERES POWDERs survive an applied isostatic pressure. The collapse strength of HOLLOW GLASS MICROSPHERES POWDERs can vary significantly depending on their density— lower density bubbles generally tend to have lower collapse strength, and higher density bubbles tend to have higher collapse strength. It is generally desirable to have a balance of high strength at the lowest possible density. Commercial types, e.g., those available from 3M under the trade designation "3M™ Glass Bubbles", can display a collapse strength from 1.5 MPa to 200 MPa and densities from 0.1 g/cm3 to 0.6 g/cm3. Methods of manufacturing hollow glass microspheres are provided where a feed composition comprising a glass powder and a blowing agent entrained in the glass powder is introduced into an opening at the first end of a vertically-aligned furnace. Agglomerated glass, unmelted oxides, or natural glassy materials can be used in place of, or in addition to, the glass powder in the feed composition. If you are looking for high quality, high purity, and cost-effective Hollow glass powder, or if you require the latest price of Hollow glass powder, please feel free to email contact mis-asia.

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