Construction Additives
Lightweight Fillers · 3M Glass Bubbles

3M HOLLOW GLASSMICROSPHERES

Reduces density, improves insulation, and supports lightweight concrete and mortar systems. Engineered hollow glass spheres that replace solid aggregate volume with air, without giving up strength where it counts.

Lightweight Fillers
AppearanceWhite free-flowing powder
True density0.12 – 0.60 g/cc
Mean particle size15 – 65 µm
Typical dosage3 – 15%
01

How Density Reduction Works

STEP 1 — SUBSTITUTION

Replaces Solid Aggregate Volume

Hollow glass microspheres are blended into the mix to replace a portion of the solid sand or fine aggregate, significantly reducing overall material density.

STEP 2 — AIR ENCAPSULATION

Traps Air Within a Rigid Shell

Each microsphere contains a sealed pocket of air enclosed by a thin, high-strength glass shell, lowering weight without creating structural voids in the system.

STEP 3 — INSULATION

Improves Thermal Performance

The uniformly distributed air-filled microspheres reduce thermal conductivity, providing improved insulation while maintaining strength and reducing overall system weight.

02

Technical Specifications

Product Type
3M Glass Bubbles (Hollow Soda-Lime Borosilicate Glass)
Function
Lightweight Filler / Density Reducer
Appearance
White Free-Flowing Powder
True Particle Density
0.12 – 0.60 g/cc (Grade Dependent)
Mean Particle Size
15 – 65 µm
Isostatic Crush Strength
250 – 18,000 psi (Grade Dependent)
Recommended Dosage
3 – 15% by Volume (Mix Dependent)
Shelf Life
Indefinite (Sealed, Dry Storage)
Packaging
20 kg Bag  •  1 Tonne Bulk Bag
03

Application Systems

LIGHTWEIGHT CONCRETE

Structural Lightweight Concrete

Reduces dead load in precast panels and structural concrete elements while maintaining mechanical performance.

INSULATION

Thermal Insulating Renders

Lowers thermal conductivity in exterior insulation and finishing systems for improved energy efficiency.

SYNTACTIC FOAMS

Buoyancy & Syntactic Systems

Provides high-strength, low-density fillers for marine, offshore and subsea buoyancy applications.

MORTARS

Lightweight Mortars & Grouts

Reduces material weight while improving workability and performance in specialty mortar and grout formulations.

04

Handling & Storage

Storage Information

Storage Condition Sealed, Dry Storage
Mixing Low-Shear Mixing, Add Late to Avoid Sphere Breakage
Handling Note Fragile Shells – Avoid High-Shear Pumping
Dust Control Handle as a Fine Powder, Minimize Airborne Dust

Safety & Documentation

Compatibility Most Cementitious & Polymer Systems
Personal Protection Refer to Safety Data Sheet (SDS)
Transport Classification Non-Hazardous (Refer SDS)
Documentation TDS & SDS Available on Request
Request a sample or the full technical data sheet

Our team can advise on the right grade for your stone type and exposure.

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