Glass microballoon filler

Microcellular fillers such as glass microballoons have been around for some time and are commonly used in syntactic foam. However, they are expensive raw materials. Sibrico Corporation, of Hodgkins, IL, has recently introduced a new, relatively inexpensive filler called Sil-Cell. This is a microsized, multiwall hollow glass filler. Sil-Cells range in size... 

These casting resins can be processed with a filler such as alumina or glass microballoons to reduce the coefficient of thermal expansion or change density. The formulations are soluble in polar organic solvents such as dimethyIformamide. Functional electronic components have been successfully potted and depotted using these solvent removable formulations. 

A wide variety of particulate substances have been added to epoxies, usually as fillers, but for other purposes as well. Added fillers are often trsed to increase epoxy viscosity, but antimony trioxide mixed with cured, ehlorinated polyester (12) imparts flame resistance, molybdenum disulfide or graphite give a sirrtace-ltrbricating effect, and polypropylene addition produces a matte surface which has improved scratch resistance. Organic or glass microballoons are sometimes added to reduce... 

Syntactic foamed plastics (from the Greek ovvxa C, to put together) or spheroplastics are a special kind of gas filled polymeric material. They consist of a polymer matrix, called the binder, and a filler of hollow spherical particles, called microspheres, microcapsules, or microballoons, distributed within the binder. Expoxy and phenolic resins, polyesters, silicones, polyurethanes, and several other polymers and oligomers are used as binders, while the fillers have been made of glass, carbon, metal, ceramics, polymers, and resins. The foamed plastic is formed by the microcapsular method, i.e. the gas-filled particles are inserted into the polymer binder1,2). 

Microballoons are bubbles with an average diameter of 40 pm (range 10-100 pm). They were originally used as a filler to control the density of plastic products. They are available as glass or bakelite material. 

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