Glass Bubbles

These versatile additives are widely used to reduce formulation weight and lower viscosity. But they can also improve abrasion resistance and reduce thermal expansion. Eliminate shrinkage. Provide a better surface for sanding. And allow you to achieve higher filler loadings, to displace high-cost resins – without diminishing product performance.

3M™ Glass Bubbles are available in a wide range of strengths, densities and average particle sizes, to meet various performance and processing requirements. The following chart lists the 3M Glass Bubbles most commonly used in paints and specialty coatings formulations.

Product	Target Crush Strength (90% survival, psi)	True Density (g/cc)	Particle Size (microns, by volume)
			Distribution
			10th%	50th%	90th%	Effective top size 95th%
K1	250	.125	30	65	110	120
S15	300	15	25	55	90	95
S22	400	.22	20	36	60	75
K20	500	.37	25	55	95	120
S32	2000	.32	20	40	75	80
K37	3000	.37	20	45	80	85
S38HS	5500	.38	15	40	75	85
K46	6000	.46	12	40	70	80
S60	10,000	.60	15	30	55	65
S60HS	18,000	.60	11	30	50	60