Applications of Hollow Glass Sphere (HGS)

Product Applications of Hollow Glass Sphere (HGS)

The main application directions of hollow microspheres include: aerospace, 5G communication, military marine, lightweight transportation, building energy conservation, oil well cementing, rubber elastomers, industrial anti-corrosion, cosmetics, adhesives, and other fields.

Application of Hollow Glass Microspheres in Adhesives

Hollow glass microspheres are lightweight, hollow, high-strength glass spheres with a high strength-to-density ratio. They are suitable for various adhesives such as silicone, epoxy, acrylic, polyurethane, and synthetic rubber. Due to their unique characteristics, they impart a series of excellent properties to adhesives:

Microsphere effect: Minimum specific surface area and low oil absorption value reduce resin consumption and result in lower viscosity of the adhesive; better flowability and processability; isotropy prevents warpage and shrinkage caused by inconsistent stress after adhesive processing.
Glass material: High chemical stability allows use as a filler without reacting with the substrate or other materials, making it suitable for various systems.
Hollow sphere: Low density reduces adhesive density and lowers volume cost; low thermal conductivity provides thermal insulation and low heat transfer properties.
Micron particle size: Improves the rheological properties of the adhesive while enhancing thixotropy; small microspheres fill the gaps between larger ones, increasing solid content and reducing VOC; easy to disperse without agglomeration.
Other properties: Can create a matte effect, improve the wear resistance of resin, and enhance the dielectric properties of materials.

White color: Offers good color compatibility.

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Application of Hollow Glass Microspheres in Anti-corrosion Coatings

Hollow glass microspheres can be widely used in weather-resistant anti-corrosion coatings, automotive coatings, marine antifouling coatings, pipeline anti-corrosion coatings, and more. They provide the following benefits in coatings:

VOC Reduction: Even at high addition levels, the viscosity of the coating does not increase significantly. This reduces the amount of organic components in the coating, lowers the emission of harmful substances during application, and effectively reduces VOC levels.
High Flowability: The spherical structure acts like ball bearings, providing a lubricating effect in the coating, thereby reducing viscosity and increasing flowability.
Low Oxygen/Water Permeability: Hollow glass microspheres consist of hollow spheres with different particle sizes, offering a wide particle size distribution that improves packing density and reduces void content. This slows down permeation rates, blocks electrochemical pathways, isolates H₂O and O₂, prevents electrolyte formation, delays corrosion initiation, and provides excellent, stable long-term protection. The micron-sized particles prevent coating collapse, increase dry film thickness, and delay the time it takes for H₂O and O₂ to reach the steel surface.
Reduced Shrinkage and Cracking: The perfect spherical shape and isotropy reduce warpage and cracking caused by inconsistent stress after the coating film forms.
Barrier and Inhibition Effects: Hollow glass microspheres improve zinc powder dispersion and enhance the barrier effect. They capture chloride ions, providing an inhibition effect that prevents corrosive particles from penetrating downward to the substrate surface.

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Application of Hollow Glass Microspheres in Building Energy Conservation

Hollow glass microspheres are widely used in reflective thermal insulation coatings, imparting special functions to such coatings. They enable reflective thermal insulation coatings to become a new type of cooling coating, integrating reflection, radiation, and thermal insulation. The coating can efficiently reflect sunlight in the range of 400nm–2500nm, preventing heat from accumulating on the object''s surface and raising its temperature. At the same time, it can dissipate heat through radiation, transferring heat from the object''s surface into the air to lower its temperature. Currently, this type of reflective thermal insulation coating is not only used in military and aerospace equipment but also widely applied in pipelines, oil storage tanks, industrial plants, large storage silos, and more.

Excellent Properties of Hollow Glass Microspheres in Reflective Thermal Insulation Coatings:

- The near-infrared reflectivity of hollow microspheres is much higher than that of ordinary fillers. They effectively reduce radiative and conductive heat transfer, thereby achieving thermal insulation.
- Being hollow, closed spheres, the closely packed hollow glass microspheres contain thin gas inside. Their excellent thermal conductivity (0.038–0.085 W/m·K) gives the coating very good thermal insulation performance.
- The spherical structure acts like ball bearings, providing a lubricating effect in the coating, thereby reducing viscosity and increasing flowability.
- They can adsorb nano-sized fillers, helping to disperse them, preventing agglomeration and sedimentation, and allowing them to be more evenly dispersed in the resin emulsion.

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Application of Hollow Glass Microspheres in Rubber Elastomers

Hollow glass microspheres are micron-sized, hollow, closed spherical particles with low density, high strength, and low thermal conductivity. When used in elastomers such as rubber, they provide functions including thermal insulation, weight reduction, and increased resilience.

Lightweight Shoe Materials
Adding hollow glass microspheres to rubber can significantly reduce the specific gravity of shoe materials, making shoes more comfortable.

Industrial Rubber
Used as fillers in cables, rubber layers of communication optical cables, and various rubber sealing rings, providing weight reduction, flame retardancy, and tear resistance.

Home Furnishing Elastomer Materials

As fillers in latex pillows, latex mattresses, sofas, and other home furnishing products, they enhance material texture and improve resilience.

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Application of Hollow Glass Microspheres in Wood Substitutes

When used in wood substitutes (synthetic wood), hollow glass microspheres improve processing performance, providing excellent quality assurance for manufacturing furniture components, automotive models, shoe molds, tire molds, architectural models, decorative items, and sculptures.

- Adding hollow glass microspheres helps achieve stable density of wood substitute products.
- Compared to ordinary mineral fillers, hollow glass microspheres offer better flowability and dispersibility, ensuring dimensional stability of finished products, reducing shrinkage and warpage, while enhancing impact strength.

Application of Hollow Glass Microspheres in Lightweight Transportation

Engineering plastics play an important role in lightweight transportation, and further weight reduction of plastic components is a key topic in technical R&D. Although currently used methods such as foaming and wall thinning have achieved some results, the decline in material properties limits their application. The hollow structure, glass material, and micron-sized particle size of hollow glass microspheres make them a functional lightweight filler, suitable for use in modified plastics and composites such as SMC/BMC, imparting a series of excellent properties to the materials:

- Reducing specific gravity
- Improving processability of the material
- Reducing shrinkage and warpage, maintaining dimensional stability
- Increasing material stiffness
- Enhancing product appearance and solving the problem of fiber show-through (floating fibers)
- Increasing surface hardness and improving scratch resistance
- Improving thermal insulation and noise reduction performance
- Reducing resin content and lowering VOC
- Improving flame retardancy and reducing smoke emission

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Application of Hollow Glass Microspheres in 5G Communication
5G communication uses millimeter waves, which have short wavelengths, poor diffraction capability, and significant signal attenuation during propagation. Therefore, it is necessary to reduce the dielectric constant and dielectric loss of materials to improve signal transmission speed and efficiency, as well as to reduce latency and loss. Due to their hollow structure, hollow glass microspheres have a low dielectric constant and low dielectric loss, making them suitable as low-dielectric fillers added to base materials to enhance the dielectric properties of products. They can be widely used in materials such as 5G base stations and antenna radomes, 5G phone mid-frames and back covers, and IoT devices.

Key Dielectric Properties of Hollow Glass Microspheres:

- Dielectric constant: 1.2–1.8
- Dielectric loss: 0.003–0.006
- Typical D90 particle size: 10 μm–40 μm
- Strength: 16,000 psi–30,000 psi

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Application of Hollow Glass Microspheres in Oil Well Cementing

The low-density, high-strength cement slurry system formulated with hollow glass microspheres is one of the main solutions to address cement slurry loss and insufficient return in low-pressure and leak-prone well cementing operations.

Advantages of cementing slurries formulated with hollow glass microspheres:

- Excellent flowability, easy to mix and pump
- Inorganic composition, high temperature resistance, and high pressure resistance ensure stable slurry performance
- Thickening time can be adjusted according to operational requirements for convenient handling
- Effective control of fluid loss to prevent contamination
- Low slurry density with high compressive strength, achieving 24-hour compressive strength of over 15 MPa
- Improves cementing quality and extends oil well life

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Application of Hollow Glass Microspheres in Oil Well Cementing

Application of Hollow Glass Microspheres in Low-Density Drilling Fluids and Cementing Slurries

Advantages of low-density drilling fluids formulated with hollow glass microspheres:

Hollow glass microspheres are inorganic non-metallic materials with weak alkalinity and very stable properties. They can be added to various existing mud systems without reacting with any chemical substances in the mud, ensuring the chemical stability of the drilling fluid.

With low density and high compressive strength, they facilitate the formulation of low-density drilling fluids and can be widely used in deep wells, ensuring constant density stability of the drilling fluid.

Their spherical shape provides excellent flowability and superior lubricating properties. During drilling operations, they reduce friction, extend the service life of equipment such as drill pipes and drill bits, significantly increase drilling speed, and greatly improve operational efficiency.

The particle size is compatible with existing drilling equipment, requiring no additional special equipment. Furthermore, the hollow glass microspheres in the drilling fluid can be recovered and reused, reducing production costs.

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Application Characteristics of Hollow Glass Microspheres in Aerospace Materials

- Low density, reducing material specific gravity
- Thermal insulation and heat retention
- Products are not prone to deformation, with good dimensional stability
- Raw material for preparing ablative materials

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