Hollow glass microspheres are used in many elastomeric applications—from shoe soles and tires to hoses and wire and cable compounds, from thermoplastic elastomers to liquid silicone rubber sealants and void fillers.
Often the main benefit is weight reduction, especially important for transportation applications. Insulation, stiffening, and cycle time reductions are additional attributes afforded by hollow glass microspheres for transportation and other applications.
In general, they are used for many of the same reasons as discussed in the Thermoplastics chapter, but physical property changes are somewhat different.
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