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3M™ Glass Bubbles K25

Technical DataSheet | Supplied by 3M

3M™ Glass Bubbles K25 by 3M is a soda-lime-borosilicate glass filler. It is a chemically inert grade possessing chemical resistance, water resistance, abrasion resistance and lower film permeability. Exhibits low alkalinity, high strength, low-density of dry film, exterior solar reflectivity, low thermal conductivity, low dielectric constant, easier washability and scrub & burnish resistance. Provides high-build/low-slump, higher filler loading, shrinkage & warpage and viscosity control at high PVCs with low solvent content. Is non-combustible and non-porous, so it does not absorb resin. It maintains or improves opacity and viscosity. It has long shelf life and the potential to lengthen time before condensation develops. Spherical shape reflects light effectively in all directions. 3M™ Glass Bubbles K25 by 3M is applicable in caulks and adhesives.

3M™ Glass Bubbles K25 Product details

Product Type
Chemical Composition
Physical Form
Spheres, Micro size
Product Status
Applications/ Recommended for
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3M™ Glass Bubbles K25 Properties


Value & Unit
Test Condition
Test Method
Target crush strength (90% survival)
xxx psi
True density
xxxx g/cm3
Particle size distribution (10%), 3M QCM 193.2
xx microns by volume
Particle size distribution (50%), 3M QCM 193.2
xx microns by volume
Particle size distribution (90%), 3M QCM 193.2
xx microns by volume
Test pressure
xxx psi
Target fractional survival
xx %
Minimum fractional survival
xx %
Calculated thermal conductivity @ 21°C
xxxxx W/(m. K)
xx % by bulk volume
Effective top size, 3M QCM 193.2
xxx microns by volume
Dielectric constant @ 100 MHz
Oil absorption, ASTM D281-84
xxxxxxxxx g oil/cc
Volatile content
xxxxx %wt
xxxxx meq/g
Last edited Dec 18, 2017
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