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K-37 Hollow Glass Microspheres are medium-density, hollow spherical glass particles designed to deliver an excellent balance of mechanical strength, durability and weight reduction. Manufactured from soda-lime borosilicate glass, K-37 offers significantly higher crush strength compared to low-density grades, making it suitable for more demanding structural and industrial applications.
With a uniform spherical morphology, K-37 Hollow Glass Microspheres improve flow, reduce viscosity rise and enhance dispersion in cementitious systems, polymers, composites, coatings, adhesives and sealants. Their chemical inertness and non-combustible nature ensure long-term stability across harsh processing and service environments. K-37 is particularly suited for applications requiring structural integrity, pressure resistance and dimensional stability while still benefiting from lightweighting.
Lightweight concrete, cementitious grouts and repair mortars
Structural and semi-structural precast elements
Flooring systems, screeds and cement-based insulation layers
Thermoset composites based on epoxy, polyester and vinyl ester resins
Thermoplastic compounds requiring improved stiffness and dimensional stability
Molded structural and semi-structural components
Sheet Molding Compounds (SMC) and Bulk Molding Compounds (BMC)
Automotive, electrical and industrial molded parts
Improved flow, reduced density and enhanced surface finish
Defense-grade composite panels and structural components
Lightweight armor backing systems and equipment housings
High strength-to-weight applications requiring durability and reliability
Industrial and construction adhesives
PU, MS polymer and hybrid sealants for demanding applications
Polyester putties and body fillers requiring enhanced mechanical strength
Anti-corrosive coatings for steel and concrete protection
High-build industrial and protective coatings
Sandable coatings, primers and surface fillers
Thermal and sound-dampening coatings
External and internal pipe coatings for corrosion protection
Coatings for oil, gas, water and industrial pipelines
Improved film build, reduced coating density and enhanced durability
Underbody PVC plastisol coatings for stone-chip resistance and NVH control
Automotive body fillers and reinforcement compounds
Lightweight structural and vibration-damping components
Bulk emulsion explosives and ANFO formulations
Density control with improved mechanical robustness
Stable, pumpable explosive systems with controlled energy release
| Property | Typical Value |
|---|---|
| Appearance | White, free-flowing powder |
| True Density | ~0.370 g/cc |
| Crush Strength (Isostatic) | ~4,000 psi |
| Average Particle Size (D50) | ~45 µm |
| Top Cut Particle Size | ~85 µm |
| Chemical Composition | Soda-lime borosilicate glass |
| Shape | Hollow spherical |
| Solubility | Insoluble in water |
| Combustibility | Non-combustible |
K-37 Hollow Glass Microspheres are non-hazardous under normal industrial handling conditions. Avoid creating excessive airborne dust. Use standard personal protective equipment including safety glasses, gloves and dust masks. Always consult the latest Safety Data Sheet (SDS) before use.
Store in a dry, cool and well-ventilated area, away from moisture and contamination. Ensure containers are properly sealed when not in use.