Porous wall hollow glass microspheres were developed by the Savannah River National Laboratory. What makes these microspheres unique is the interconnected porosity spread throughout their wall allowing various materials to travel from the surface to the hollow interior. With their characteristic porosity, the porous wall hollow glass microspheres are a great tool for encapsulating or filtrating different materials. Unfortunately, there is little information available on the mechanical properties of porous wall hollow glass microspheres.

The main goal of this research was to develop a method to crush individual microspheres and statistically analyze the results. One objective towards completing this goal was to measure the microsphere diameter distribution. Microsphere diameter is a major factor affecting strength as well as the Weibull parameters. Two different methods, microscopy counting and laser light scattering, used in the research yielded similar distributions.

The main objective of this research was to analyze the crush strength of individual microspheres. Using nanoindentation, data were collected to analyze the crush strength of porous wall hollow glass microspheres in uniaxial compression. Nanoindentation data were used to analyze how the strength of the porous wall hollow glass microspheres changes through the different stages of production and at different diameter ranges. Data for microspheres were compared to ARC microspheres. Most data were analyzed using a statistical technique known as the two parameter Weibull analysis. The data indicated that the strength generally decreased as the microsphere diameter increased. Scattering in the data was nearly the same across all sample sets tested. Results indicated that the porous wall hollow glass microspheres were weaker than the ARC hollow glass microspheres. This is primarily due to the addition of wall porosity in the porous wall hollow glass microsphere.

This article comes from nmt edit released

Microspheres are small spheres made of various types of materials that are usually less than 100 microns in diameter. These microspheres can be hollow or solid and have been made from a variety of materials including metals, polymers, and ceramics/ glasses.

Hollow glass microspheres have found use in a variety of other applications from defense to transportation to construction. This hollow glass microsphere was unique due to the development of interconnected porosity in the glass wall of the microsphere and is known as a Porous Wall Hollow Glass Microsphere (PWHGM). The addition of pores in the microsphere makes it possible to fill the hollow cavity of the PWHGM with different materials. This development creates many new applications for filtration and encapsulation using PWHGMs. The basic properties of PWHGMs are different compared to other hollow glass microspheres. PWHGMs can have a diameter that ranges from 2 to 100 microns.

PWHGMs have wall thicknesses in the range of approximately 0.5 to 2 microns giving them a diameter to wall thickness ratio range between 4 and 200. By definition thin walled structures have diameter to wall thickness ratios of greater than 10. Unlike many commercial microspheres, such as the soda lime borosilicate ones manufactured, PWHGMs are comprised of around 96% pure silica.

PWHGMs start out as borosilicate HGMs and then are heat treated. Due to their composition, these HGMs undergo spinodal decomposition and phase separate into two interconnecting phases: sodium borate and silica. The sodium borate is leached away with acid leaving mostly porous silica as the wall material. This is how the characteristic nanoporosity of the PWHGMs is created. The wall porosity will generally be 0.01 to 0.1 microns in diameter. Encasing the wall are two layers that are thought to be created during the leaching step. These layers exhibit a different type of porosity than the inner wall porosity.

This article comes from vtechworks edit released

Light-weight and high-strength polymer composites have attracted the special attention of automotive and aerospace sectors since they offer advantages such as less fuel consumption and higher fuel efficiency. In the present study, an effort has been made to prepare such polymer composites using natural fiber and very low-density hollow inorganic particles.

The use of hollow glass microspheres as a potential filler particle for making light-weight hybrid polymer composites was investigated. Polypropylene (PP) and maleic anhydride-grafted-polypropylene (in 9:1 ratio) constituted the base matrix (BM). For strength reinforcement, alkali-treated short bamboo fibers (SBF) were employed, while for making the composite material light in weight, hollow glass microspheres were incorporated.

Silane treatment of hollow glass microspheres by (3-aminopropyl)triethoxysilane was performed to enhance interfacial adhesion with BM. Adequate wetting of hollow glass microspheres and SBF was evident from the SEM images of cryo-fractured samples. A 14% increase in tensile strength was observed in comparison to virgin PP for the composite with 5 wt.% hollow glass microspheres, and a desirable decrease in density was observed for all the composite samples with increasing content. Improvement in hardness but a marginal decrease in impact strength due to hollow glass microspheres fillers was observed.

Rheological analysis of the composite melt samples showed an apparent increase in the complex modulus with increasing content. Thermal analysis of the composites revealed a significant impact of hybrid fillers on the crystallinity, with SBF showing a minimal effect while hollow glass microspheres reducing it significantly. Wide-angle x-ray diffraction spectra showed changes in the crystal structure of the composite with noticeable β-form peaks.

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Hollow glass microspheres combine all the advantages of spherical shape with the additional benefits of low density at an economic cost. With densities of 0.7 – 0.85 g/cc, we reduce the weight of systems into which it is formulated.

At 15,000 MT/Annum capacity, we are one of the world’s direct producers of cenospheres. With our trading operations and connections to China and India, we are able to supply you with consistent quality cenospheres anywhere in the world.

This article comes from spherefill edit released

1. Because of low density, hollow gass microspheres can reduce the weight of adhesive, what’s more, it has high strength, which won’t disturb the tensile strength and elasticity of sealants.

2. Since the main component is soda-lime borosilicate glass, the Chemical properties of hollow gass microsphere is very stable, sealants with hollow gass microspheres inside has excellent ageing resistance.

3. High temperature resistance, the melting point: 650℃.

4. The particle size of hollow gass microsphere is very small(can be customized), so the bonding is very strong.

5. The fluidity of hollow gass microsphere is better than Irregular filler.

6. Hollow gass microsphere has a relatively small surface area, so it can keep relatively suitable viscosity when using large volume.

This article comes from hollowlite edit released

In this study, poly(acrylonitrile-co-butadiene-co-styrene)/hollow glass microspheres (ABS/HGM) composites were prepared by means of a twin-screw extruder. Hollow glass microspheres were incorporated at different loadings of 2.5, 5.0, and 7.5 wt.% at the central extruder zone with different types of ABS.

The morphological, physical, thermal, rheological and mechanical properties of ABS/HGM composites were investigated. Statistical analysis reveals that high impact ABS addition is significant for improving composites’ impact strength.

The results also indicated that addition of 5.0 wt.% of hollow glass microspheres along with 5.0 wt.% of powdery ABS at the central extruder zone maintains the hollow glass microspheres integrity while powdery ABS contributes to better filler dispersion in the matrix resulting in light-weight composites having improved mechanical properties.

This article comes from scielo edit released

High quality hollow glass microspheres for research and development are always in high demand.? In an effort to better serve scientists Cospheric recently added a complete line of high quality borosilicate microspheres, and microbeads.

Borosilicate hollow glass microspheres offers? advantages over standard soda lime glass microbeads.

The high roundness, and low thermal expansion make borosilicate hollow glass microspheres an excellent candidate for use as spacers in epoxy bond lines, or other applications which require stability over a wide temperature range.

Borosilicate hollow glass microspheres are now offered in narrow size ranges from 0.03mm to 0.2mm with greater than 90% of the particles in range.

This article comes from microspheres edit released

Here only microspheres and microbubbles made in amorphous materials, namely in oxide or chalcogenide glasses and in amorphous polymers, will be considered. For the sake of completeness, however, it should be noted that many other materials, either natural or synthetic, can be used to fabricate Ms&Mb for different applications.

A few examples include stainless steel microspheres (for conductive spacers, shock absorption, and micromotor bearings); metallic nickel hollow glass microspheres (enhanced magnetic properties; Ni/Pt bimetallic microbubbles have potential applications in portable hydrogen generation systems, due to catalytic properties); single-crystal ferrite microspheres (for applications not only as magnetic materials but also in ferroflfluid technology and in biomedical fifields, e.g., biomolecular separations, cancer diagnosis and treatment, magnetic resonance imaging); single-crystal semiconductor microspheres (for active WGM resonators); ceramic ZrO2 hollow glass microspheres (for thermal applications).

Glass, polymer, ceramic, metal solid and hollow glass microspheres are commercially available; there is a wide choice of quality, sphericity (Sphericity was defifined in 1935 by the geologist H. Wadell, with reference to quartz particles (J. Geology 1935, 43, 250) as the ratio of the surface area of a sphere (with the same volume as the given particle) to the surface area of the particle), uniformity, particle size and particle size distribution, to allow the optimal choice for each unique application.

Hollow glass microspheres have a high density of about 2.2g/cc for borosilicate glass spheres, 2.5g/cc for soda lime glass spheres, and 4.49g/cc for barium titanate glass spheres. Hollow glass microspheres have densities as low as 0.14 g/cc.Depending on the application requirements, solvents used, desired buoyancy, difference in density between polyethylene and glass microspheres might become a critical factor when selecting the right material.

Hollow glass microspheres have the highest crush strength. Hollow glass microspheres have the lowest crush strength, which varies widely with the grade of material, density, sphere diameter, shell thickness.

Hollow glass microsphere imparts visual and material benefits that cannot be replicated when spheres are made of other materials such as ceramics or polymerics, aluminum oxides, or silicas and mineral fillers. Solid glass refracts, bends and reflects light. Most ceramics do not transmit light or exhibit mirror-like reflection due to their internal crystalline structures and surface irregularities. Instead of being reflected back, the light is “trapped” in the structure and emitted as diffuse or scattered reflectance, which is not as strong or direct as light transmitted through glass, which produces mirror-like reflectance. Hollow glass microsphere can also possess numerous surface and interior micro irregularities that also diffuse light. Because the thickness of a hollow bead’s wall is inversely proportional to its diameter, however, the larger hollow glass microsphere that might offer some reflective properties have very low crush strengths, which precludes their incorporation into most formulations.

Hollow glass microspheres, also called glass beads, provide multiple benefits including enhanced processing, excellent chemical and heat resistance, thermal stability, low oil absorption, and are used in automotive, electrical, household appliance, adhesives, packaging, paint and construction industries. Glass is non-toxic, extremely stable and recyclable. Hollow glass microspheres are inert and are not nanoparticles and therefore do not raise the regulatory and other concerns of sub-micron-size materials.

This article comes from cospheric edit released

Hollow Glass Microspheres are advanced, low-density additives used in a variety of industrial applications. They are available in a wide range of densities and crush strengths, including our newest glass microsphere.

Performance Additive iM30K, capable of surviving most compounding and molding processes. These hollow glass microspheres of soda-lime/borosilicate glass are water insoluble, chemically stable and offer a high strength-to-weight ratio.

This article comes from castro edit released