Hollow glass microspheres H42, H35, H20 as an additive in thermal
insulation paints
Description of hollow glass microspheres:
Hollow glass microspheres are hollow, small and round spherical
powders containing inert gas. As a new type of filler, it has the
advantages of light weight, high strength, good fluidity, heat
insulation and corrosion resistance, etc. It is used in lightweight
composite materials, coatings, aerospace, deep sea cementing,
electrical insulation materials, thermal insulation materials,
military explosives It has a wide range of application prospects in
such fields as "space materials".
Specification of hollow glass microspheres:
| Types | True Density
(g/cm3) | Bulk Density
(g/cm3) | Compressive
Strength (Mpa/PSI) | Particle size | Application |
| D50 (μm) | D90 (μm) |
| H20 | 0.20-0.22 | 0.10-0.12 | 4/500 | 65 | 110 | Epoxy Tooling board, Floating material,Emulsion explosive, Car
repair putty, Paints |
| H22 | 0.21-0.24 | 0.11-0.13 | 5/750 | 65 | 100 | Epoxy Tooling board, Paints |
| H25 | 0.24-0.27 | 0.13-0.15 | 5/750 | 65 | 100 | Paints, Sealants, Buoyancy materials |
| H28 | 0.27-0.30 | 0.14-0.17 | 10/1500 | 55 | 85 | Cementing slurry and Drilling fluids |
| H30 | 0.29-0.32 | 0.15-0.18 | 10/1500 | 55 | 85 | Thermal-insulation paints.Buoyancy materials |
| H32 | 0.31-0.33 | 0.17-0.19 | 14/2000 | 45 | 80 | Paints,SMC/BMC, Sealants, Putty |
| H35 | 0.33-0.37 | 0.18-0.21 | 21/3000 | 40 | 70 | Cementing slurry & Drilling fluids |
| H38 | 0.37-0.39 | 0.19-0.22 | 38/5500 | 40 | 65 | Paints,SMC/BMC, PVC Plastisils,
Buoyancy materials |
| H40 | 0.39-0.42 | 0.19-0.23 | 28/4000 | 40 | 70 | Cementing slurry, Drilling fluids, Paints |
| H42 | 0.41-0.44 | 0.21-0.24 | 55/8000 | 40 | 60 | Cementing slurry & Drilling fluids |
| H46 | 0.44-0.48 | 0.23-0.26 | 41/6000 | 40 | 70 | Cementing slurry & Drilling fluids,
SMC/BMC |
| H50 | 0.48-0.52 | 0.25-0.27 | 55/8000 | 40 | 60 | Cementing slurry& drilling fluids |
| H55 | 0.53-0.57 | 0.27-0.29 | 69/10000 | 40 | 60 | Cementing slurry & drilling fluids |
| H60 | 0.58-0.62 | 0.29-0.34 | 83/12000 | 40 | 65 | Cementing slurry & drilling fluids |
Application of hollow glass microspheres
Hollow glass microspheres are often used as additives in paints and
coatings to change and improve the performance of traditional
coatings and reduce costs.
Because hollow glass beads have the characteristics of insulation,
flame retardant, high and low temperature resistance,
anti-corrosion, fire prevention, heat preservation,
self-lubrication and good fluidity, large specific surface area and
small particle size.
Therefore, it is widely used in various high-temperature insulating
paints, high wear-resistant anti-corrosion paints, advanced
furniture paints, ship rust anti-corrosion paints, automotive
advanced paints, exterior paints for various machinery and
equipment, interior and exterior wall coatings for buildings and
various thermal insulation coatings. Marine anti-corrosion coatings
and fire retardant coatings.
Why choose hollow glass microspheres for coating and paints?
1) Reduce the weight of the coatings and paints
Hollow Glass Microspheres density is only 0.10-0.62g/cm3.
2) Low thermal conductivity
Coating/Painting added 10% Hollow glass microspheres, it can create
25-40°C temperature difference.
3) Good economy
Compared with other fillers, hollow glass microspheres have the
smallest surface area to volume ratio and low oil absorption rate,
which can reduce the amount of matrix resin and reduce costs. At
the same time, hollow glass beads of the same weight occupy more
volume, further reducing the cost. It also reduces VOC.
Improve the thermal insulation properties of the coating and paints
Hollow glass microspheres have low thermal conductivity and high
thermal reflectivity due to
their hollowness, which can effectively reduce radiative heat
transfer and transfer heat, and
play the role of thermal insulation.
4) Reduce the shrinkage, warpage and impact of the product.
Because of its hollow structure, the hollow glass microspheres will
absorb and digest the
impact strength when it is impacted, so that the impact resistance
of the paint film is
improved. At the same time, it is isotropic, reducing the shrinkage
of the paint film,
improving the crack resistance and heat insulation performance, and
also protecting the
paint film from thermal shock caused by the alternation of rapid
heating and rapid cooling.
5) Adjust the viscosity of the coating system
Hollow glass microspheres has a smooth surface, low porosity
between different particle sizes, low viscosity and good fluidity,
which can adjust the viscosity of the coating and improve the
fluidity of the coating.
