Glass microballoons

Incorporation of hollow or expandable spheres of resin or of glass (microballoons). 

Foam Density lb./ft.3 Glass Microballoons Epoxy Macroballoons Uniaxial Compressive Yield Strength, psi Hydrostatic Compressive Strength, psi Method of Preparation Resin System... 

Abstract— The use of organosilanes as adhesion promoters for surface coatings, adhesives and syntactic foams is described and reviewed in the light of published work. Data are presented on the beneficial effect of silanes, when used as pretreatment primers and additives, on the bond strength of two pack epoxide and polyurethane paints applied to aluminium and mild steel. It is shown that silanes when used as additives to structural epoxide and polyurethane adhesives are less effective than when used as pretreatment primers on metals but are highly effective on glass substrates. The compressive properties of glass microballoon/epoxide syntactic foams are shown to be markedly improved by the addition of silanes. 

Figure 6. The effect of APES addition at increasing wt% on the stress/strain behaviour of an MNA/ Epikote 828/glass microballoon syntactic foam.

Property Calcium carbonate Kaolin Talc Mica Glass microballoons Hydrous alumina Silica Wood flour... 

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... 

Properties of an epoxy system filled with glass microballoons are shown in Table 9.11. Other low-density microballoons, based on phenolic and other materials, have been developed for use in epoxy adhesive formulations. 

TABLE 9.11 Properties of DGEBA Filled with Glass Microballoons Compared with Resin Filled with Mica (Epoxy Cured with 12 pph Diethanolamine)23... 

The incorporation of glass microballoons has already been mentioned in the context of density reduction. 

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. 

Explosive emulsions are minute droplets of ammonium nitrate solution emulsified to the texture of margarine in a fuel (often diesel). Because the ammonium nitrate remains in solution, it is not an explosive and maintains an inherent high degree of safety during transportation. Emulsions are sensitized just prior to use by the introduction of gas bubbles or glass microballoons which create voids around which ammonium nitrate solidifies (the explosive form). Initiation is caused by the shockwave of a high explosive detonator. 

The glass microballoons were obtained from Potters Industries (Q-CEL6014, average outer diameter 85 pm, bulk density 0.08 g/cm, effective density 0.14g/cm, maximum working pressure 1.73 MPa, and wall thickness 0.8 pm). These raw materials have been used previously for the smart syntactic foam [38] and conventional epoxy based syntactic... 

Figure 4.18(a) shows that an arbitrary thermomechanical deformation mapping from an initial undeformed and unheated configuration 2q to a spatial configuration (deformed) 1 can be multiplicatively decomposed into thermal and mechanical deformations. The mechanical deformation can be decomposed into the portion by the polymer and the portion by the glass microballoon. The portion by the polymer can be further decomposed into plastic and elastic. Finally, the portion of the microballoon, while it is elastic, can be further decomposed into damaged and undamaged components. 

Figure 6.55 Distribution of thermoplastic (CP) particles (irregular shaped) and glass microballoon (GMB) particles (spherical shaped) in the PSMP matrix...

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... 

Ecosphere hollow glass microballoons Emerson Cuming... 

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