Hollow glass microsphere, glass bubble, glass microsphere, floater, Floating Beads, pearl drift
Summary：
K25 glass bubbles have a density of 0.25 g/cc and an isostatic crush strength of 750 psi.
Properties：
Lower viscosity, improved flow
Increased filler loading, reduced cost
VOC reduction
Chemical stability and inertness
Reduced dielectric constant
Thermal conductivity reduction
Temperature resistance
Applications：
Mining
Paints and coatings
Insulation and buoyancy
Transportation
Glass microspheres are microscopic spheres of glass manufactured
for a wide variety of uses in research, medicine, consumer goods and
various industries. Glass microspheres are usually between 1 to 1000
micrometers in diameter, although the sizes can range from 100
nanometers to 5 millimeters in diameter. Hollow glass
microspheres,sometimes termed microballoons, or glass bubbles have
diameters ranging from 10 to 300 micrometers.
Hollow spheres are used as a lightweight filler in composite materials
such as syntactic foam and lightweight concrete. Microballoons give
syntactic foam its light weight, low thermal conductivity, and a
resistance to compressive stress that far exceeds that of other
foams. These properties are exploited in the hulls of submersibles and
deep-sea oil drilling equipment, where other types of foam would
implode.
Hollow spheres of other materials create syntactic foams with
different properties, for example ceramic balloons can make a light
syntactic aluminium foam.
Hollow spheres also have uses ranging from storage and slow release
of pharmaceuticals and radioactive tracers to research in controlled
storage and release of hydrogen. Microspheres are also used in
composites to fill polymer resins for specific characteristics such as
weight, sandability and sealing surfaces. When making surfboards for
example, shapers seal the EPS foam blanks with epoxy and
microballoons to create an impermeable and easily sanded surface
upon which fiberglass laminates are applied.
Glass microspheres can be made by heating tiny droplets of dissolved
water glass in a process known as ultrasonic spray pyrolysis (USP),
and properties can be improved somewhat by using a chemical
treatment to remove some of the sodium. Sodium depletion has also
allowed hollow glass microspheres to be used in chemically sensitive
resin systems, such as long pot life epoxies or non-blown
polyurethane composites
Additional functionalities, such as silane coatings, are commonly
added to the surface of hollow glass microspheres to increase the
matrix/microspheres interfacial strength (the common failure point
when stressed in a tensile manner).
Microspheres made of high quality optical glass, can be produced for
research on the field of optical resonators or cavities.
Glass microspheres are also produced as waste product in coal-fired
power stations. In this case the product would be generally termed
“cenosphere” and carry an aluminosilicate chemistry (as opposed to
the sodium silica chemistry of engineered spheres). Small amounts of
silica in the coal are melted and as they rise up the chimney stack, expand
and form small hollow spheres. These spheres are collected together
with the ash, which is pumped in a water mixture to the resident ash dam.
Some of the particles do not become hollow and sink in the ash
dams, while the hollow ones float on the surface of the dams. They become a
nuisance, especially when they dry, as they become airborne and
blow over into surrounding areas.
Source: Wikipedia
hollow glass microsphere is a specially Hollow glass microspheres T60 processed glass beads, its main feature is denser than glass beads smaller thermal conductivity is worse. Typical particle size range 10-180 microns , bulk density 0.1-0.25 g / cc, a lightweight, low thermal conductivity , sound insulation, high dispersion , electrical insulation and thermal stability , etc., in recent years developed a versatile , high-performance new lightweight material .
widely used in glass fiber reinforced plastic products , composite foam , artificial marble , synthetic wood , sound insulation materials , putty , deep-sea buoyancy material , bowling, low-density adhesives, sealing materials, lightweight resin crafts, mural wall frames, wallboard sandwich layer structure , electronic industry lightweight packaging materials, absorbing materials, lightweight concrete , emulsion explosives.
Good fluidity, product size, excellent stability. As a result of hollow glass microspheres are small ball, in a
liquid, moves like the miniature ball bearing, than flake, needle or irregular shape of the filler has good fluidity,
the resulting microspheres effect, to make the mixture viscosity decreased, the filling properties of the natural
good; good processing performance, can improve the production efficiency by 10% ~ 20%. Because the spherical body is
isotropic, so filled microspheres not due to alignment caused by different parts of shrinkage rate inconsistent
shortcomings, to ensure product size stability, does not warp, solve the profile, large plastic injection molding
products processing long-standing deformation problem.
The color is pure white and the appearance of calcium carbonate, which can be widely applied to any pair of color appearance requirements of the product.The proportion of light volume. After filling the product greatly reduce weight, reduce the main raw material of resin consumption, reduce the cost become possible.
Filling process is simple. Hollow glass microspheres because of their own reasons, some models should be treated by coupling agent can be directly and the main ingredients (for thermosetting resin ) or in the form of filling masterbatch ( applicable to thermoplastic resin ) relatively more trouble. Filled with hollow glass microspheres products and the use of foaming agent products have the same effect; and the various physical and mechanical properties and better to die, no special requirements.
Glass microsphere is a new ultra light filling material of hollow closed spherical.As the particle diameter, wall thickness of the true density at 0.12 ~ 0.60g /cm3, particle diameter in 15 ~ 135um ( including a variety of specifications ). With a light weight of large volume, low thermal conductivity, dispersibility, fluidity, good in stability. In addition, glass microspheres also has insulating, self-lubricating, heat insulation,water, corrosion resistant, radiation resistant, nontoxic and excellent performance.
This product of glass microspheres can be filled in the vast majority of thermosets, thermoplastic resin product, can be improved or determined material are several properties: density ( lower), liquidity, viscosity, rheological properties ( lower ) ( thickening, not tears ),matte effect, shrinkage ( lower ), mechanical processing ( improve ), impact strength,hardness, insulation, explosive performance, acoustic properties, thermal insulation properties..
Microsphere is a term used for small spherical particles with diameters of the Order of the micrometer (typically 1 pm to 1000 pm (1mm)). The microspheres are sometimes called microparticles.
microspheres can be manufactured from various natural and synthetic materials. Glass microspheres, polymer microspheres and ceramic microspheres are commercially available. Solid and hollow microspheres vary greatly in density and, therefore, are used for different applications. The hollow microspheres are commonly used as additives to reduce the density dun material. Solid microspheres have numerous applications depending on what material they are constructed and what size they are.
Polyethylene and polystyrene microspheres
are two most common types of polymer microspheres.
Polystyrene microspheres
are commonly used in biomedical applications because of their ability to facilitate processes such as cell sorting and precipitation immunio. Proteins and ligands on polystyrene absorb easily and permanently, which makes polystyrene microspheres suitable for medical research and biological laboratory experiments.
Polyethylene
microspheres are commonly used as permanent or temporary care. Lower melting temperature polyethylene microspheres allows to create structures and porous ceramic materials dautres. High sphericity of polyethylene microspheres, as well as the availability of color and fluorescent microspheres, makes them highly desirable for the visualization and the analysis of the flow of fluid flow, microscopy techniques, health sciences, troubleshooting processes and applications Much research. Polyethylene loaded microspheres are also used in digital electronic paper displays.
Glass microspheres are mainly used as a filler and volumizer for weight reduction, road safety reflector, additives for cosmetics and adhesives, with limited applications in medical technology.
  glass bubble;
Ceramic microspheres are mainly used as the grinding medium.
microspheres vary considerably in quality, sphericity, luniformité size and particle size distribution. The microsphere must be selected for each application.
We believe that the microspheres are Mon least understood commercial products. Most people associate microspheres with their use as filler in plastics and composite materials (hollow glass microspheres). This nest quune many applications.
THE USE seconds less microspheres is included in cosmetics and personal care industrys. Ceramic microspheres and polyethylene are used in cosmetics to create a soft and silky texture, and to provide a filler for reducing wrinkles on the skin. The personal care industry use polyethylene microspheres exfoliating agents in shampoos and shower gels (colored objects in suspension).
Fluorochromes – Excitation and Emission Wavelengths
Below is a very useful table of different fluorochromes that can be used in research requiring precise answers. For additional information about using fluorescent microspheres fluorochromes see this related article. "Fluorescent Microspheres – Properties and Applications" floating beads;
Table fluorochrome is also available for download in pdf format
Spheres of barium titanate glass with IR than 1.9
barium titanate glass microspheres are excellent to be used as a functional additive for reflective paints and coatings. Spheres with sizes of approx 50 microns (~ 0.002 inch) average diameter to provide a sufficiently small size for most of the coatings while providing a size large enough for a large amount of light reflectance. Glass spheres, barium titanate are offered partially coated aluminum retroreflective version uploading in transparent coatings, and uncoated spherical glass powder for use in colored paints.
glass beads barium titanate offers one of the most high refractive index with an IR greater than 1.9 which provides retroreflectivity high intensity of these areas.
For applications requiring a load to high density areas of barium titanate glass offer 4 glass bubble.5g/cc density, which is almost double that of glass spheres soda lime most common. More dune high density glass spheres barium titanate has a hardness of approx 55-65 on Gardner and ladder resistance lécrasement more than 30,000 psi (207 MPa), making these areas highly resistant in environments with high wear .
High density glass microspheres|4.5 Density Their size ranges from 30 microns to 1 mm
barium titanate glass microspheres are glass spheres high density solids. At a density of 4.5g/cc these solid glass spheres can be used for many scientific applications where high density and optical clarity is required. In addition to high density, they also offer a refractive index greater than 1.9.
Bulk quantities are available in 30-100um and vary in size from 0.3 to 1.0 mm.
For experiments requiring the highest accuracy pearls can be purchased with grades classified> 90% of spheres in a specific size range. Standard sizes include narrow ranges below.
38-45um, 53um 45, 53-63um, 75um, 63-90um glass bubble, 75-90, 106um, 0.25mm-0.3mm, 0.3mm-0, 35mm, 0.36mm 0.42mm-,-0.43mm 0.5mm, 0.5mm, 0.6mm, 0.6mm, 0.7mm, 0.71mm 0.85mm d, and 0.85 mm to 1.0 mm.
Product prices and availability are
is under BTGMS Cospheric barium titanate (glass microspheres)
