Hollow Glass Microspheres Thermal Insulating Bulk Architectural Coating Raw Material
Our hollow glass microspheres are manufactured from high-quality soda-lime-borosilicate glass. The glass melt is formed into microscopic hollow spheres through a high-temperature spraying process, producing extremely thin-walled, low-density particles with a smooth spherical surface. Available grades cover true density from approx. 0.25 to 0.50 g/cm³ and particle size from approx. 10 to 110 μm.
As chemically inert inorganic filler, the microspheres do not absorb resin or solvent, which helps formulators increase pigment volume concentration, raise volume solids and reduce VOC emission. Their spherical shape improves flow and leveling, while the hollow structure delivers excellent thermal insulation with low thermal conductivity, reducing heat transfer through the coating film.
The microspheres effectively lower coating density for lighter-weight films, reduce shrinkage and internal stress to improve crack resistance, and enhance anti-settling performance of fillers in the formula. They are compatible with solvent-based, waterborne and powder coating systems.
Widely used in marine & anti-corrosion coatings, architectural thermal-insulation coatings, automotive coatings, fire-retardant coatings, coil coatings and industrial paints. Available in small bags and drums for lab & pilot use, and bulk supply for coating manufacturers and compounders. Large-volume orders support custom density / particle size grades and private-label packing.
5.0
Product name:
Hollow Glass Microspheres
Brand:
QianLi
Place of Origin:
China
Packing:
Woven bag, Ton bag , Customized packaging
ODM & OEM:
Available
Minimum order quantity:
500kg
design customization
Please fill out the form below to request a quote or to request more information about us. Please be sure to upload customized requirement documents or pictures, and we will get back to you as soon as possible with a response. we're ready to start working on your new project, contact us now to get started.
Please fill out the form below to request a quote or to request more information about us. please be as detailed as possible in your message, and we will get back to you as soon as possible with a response. we're ready to start working on your new project, contact us now to get started.
Product Details
· Sealed, thin-walled hollow microspheres; white powder appearance: Appears as a fine white powder to the naked eye and as intact, sealed hollow spheres under a microscope; features thin shells with inert gas encapsulated inside.
· Intact spherical particles with excellent flowability: Spherical structure—distinct from flake-like or needle-like mineral fillers—allows for rolling flow within resin systems and minimizes agglomeration.
· Multiple grades based on density and compressive strength: A comprehensive range covering everything from low-density/low-strength to high-density/high-strength options, suitable for applications ranging from standard coatings to high-pressure oil and gas environments.
· Controllable particle size distribution and uniform sizing: Median particle size (D50) typically ranges from 15 to 85 μm; high batch-to-batch consistency ensures minimal performance variation in the finished product.
· Borosilicate glass composition; water-insoluble: Inorganic glass material that does not dissolve in water or release colored impurities; slightly alkaline (pH 8.0–9.5).
· Low oil absorption and high loading capacity: Spheres have a low specific surface area and low oil absorption, enabling high filler loading levels without excessive resin consumption.
Advantages
01
Significant weight reduction and lower product density
Extremely low true density—far lower than calcium carbonate, talc, or solid glass microspheres—significantly reduces the weight of the finished product, enabling lightweighting
02
Excellent thermal and acoustic insulation
Sealed hollow cavities trap static air; low thermal conductivity imparts thermal insulation and sound-absorbing/noise-reducing properties to coatings and composite materials
03
Chemically stable, resistant to acid/alkali corrosion, and non-flammable
Made of inert borosilicate glass, these spheres resist weak acids and alkalis and are inherently non-flammable, enhancing the flame retardancy of the final product
04
Improved processing flow and reduced system viscosity
The spherical "ball-bearing" effect lowers the viscosity of resin and coating systems, enhancing mold-filling capabilities and improving performance during spraying and casting processes
05
Low dielectric constant, suitable for electronic insulation materials
Dielectric constant of 1.2–2.0 and low dielectric loss make them ideal for insulating materials and electronic composites
06
Comprehensive product range with customizable selection
Grades with varying compressive strengths are available—ranging from applications in lightweight coatings to high-pressure oil and gas well cementing—supporting customized selection for specific customer projects
Application Scenarios
应用1 (3)
Emulsion explosives and specialty industrial formulations
Used as a sensitizing filler in emulsion explosives, as well as in lightweight modified formulations for models and handicrafts
1 (54)
Plastic and rubber modification/filling
Fillers for modified plastics, shoe sole materials, and rubber products; reduces weight, improves sound insulation, and lowers material costs
2 (11)
Thermal insulation coatings and architectural putties
Thermal insulation coatings for interior and exterior walls, fire-retardant coatings, and automotive repair putties; enables lightweight thermal insulation and reduces coating density
应用5
Aerospace, defense, and specialty advanced materials
Lightweight aerospace composites and electronic insulation components; meets specialized requirements for low density, low dielectric properties, and temperature resistance
FAQ
1
What is the difference between hollow glass microspheres and solid glass microspheres?
Solid glass microspheres are made of solid glass with a density of approximately 2.4–2.5 g/cm³; they are primarily used for sandblasting, shot peening, and road marking reflectivity. Hollow glass microspheres have a hollow interior and very low density; they serve as lightweight fillers and cannot be used for sandblasting. Their applications are completely different and they are not interchangeable.
2
Can hollow glass microspheres be used for sandblasting or shot peening?
No. Due to their thin-walled structure, they shatter upon impact and cannot function as an abrasive medium. They are suitable only as fillers for incorporation into coatings, resins, or cement.
3
How do I select the right grade, density, and compressive strength?
For low-pressure mixing or coatings/putties: choose low-density, low-compressive-strength grades. For compounding, extrusion, or high-pressure processes: choose high-density, high-compressive-strength grades. For oil and gas well cementing: select the grade based on downhole pressure requirements. Please contact customer service for recommendations based on your specific operating conditions.
4
What causes the microspheres to break during processing?
The hollow shells have a maximum pressure tolerance; excessive mixing speeds, high-shear twin-screw processing, or high-pressure extrusion can crush the microspheres. You need to adjust the process parameters to reduce shear forces and preserve the integrity of the spheres.
5
What are the storage requirements? Do they absorb moisture?
They must be stored in sealed containers within a cool, dry warehouse. The powder easily absorbs atmospheric moisture, which can impair dispersion; use the product as soon as possible after opening.
6
Can particle size and packaging be customized for bulk orders?
Standard grades are available for immediate order. Large orders support customized particle size screening and custom packaging (e.g., printing your brand logo); please contact customer service for samples and quotes.
7
What safety precautions should be taken during handling?
As this is an inorganic powder, wear a dust mask and safety goggles during handling to prevent inhalation; avoid direct contact with eyes and minimize dust generation.
8
Will broken microsphere fragments affect product performance?
A small amount of broken shells has a negligible effect; however, extensive breakage during processing will negate the weight-reduction and thermal insulation benefits and increase the system's specific gravity. Therefore, controlling the shear intensity of the processing equipment is essential.
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