QCELQuality Catering Equipment Limited (UK)
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Potters' other hollow microsphere product, Qcel, can be as light as 0.14 g/cc, but it has a bigger particle size (90 microns).
Exemplary microsphere materials are Expancel thermoplastic expandable microspheres from Akzo Nobel and Qcel Hollow Microspheres and Extendospheres Ceramic Hollow Spheres from PQ.
include new QCel 7019, 7023, and 5043, whose low alkali and moisture content reportedly provide better stability in polyester resins for putty and spray-up.