Lightweight Hollow Glass Spheres, Hollow Glass Microbeads as Construction & Composite Material Fillers. High Purity Content: 99.9% purity with borosilicate glass material ensures superior quality. Excellent Thermal Insulation: Low thermal conductivity provides effective insulation for tanks and pipelines. Superior Flowability: Spherical hollow structure ensures easy dispersion and free-flowing properties. Custom Particle Size: OEM service available for customized particle sizes to meet specific needs. Versatile Applications: Suitable for automotive, aerospace, oil well cementing, and 5G communication. Custom Packaging Options: Flexible packaging types and customized printing available for brand showcase.