High Strength Hollow Glass Microspheres Glass Beads for Deep Water Buoyancy Composite and Marine Material

High strength hollow glass microspheres are premium hollow glass beads specially engineered for deep-sea buoyancy systems and high-performance marine composite materials. Featuring a rigid closed hollow structure and high-strength borosilicate glass formulation, these microspheres deliver outstanding hydrostatic pressure resistance, ultra-low density and excellent structural stability, making them the core lightweight filler for deep water buoyancy modules, marine structural parts and offshore engineering composite materials.

The most prominent advantage of the product is its exceptional compressive strength, which enables it to withstand ultra-high deep-water pressure without crushing or collapsing. Compared with ordinary low-strength hollow glass beads, it maintains complete particle integrity in deep sea environments, ensuring stable volume and consistent buoyancy performance for a long time. With ultra-low bulk density, the microspheres effectively reduce the overall weight of marine composites, greatly improving the buoyancy-to-weight ratio and helping marine equipment achieve lightweight, high buoyancy and low-resistance navigation performance.

In terms of marine environmental adaptability, high strength hollow glass microspheres possess excellent seawater corrosion resistance, acid and alkali resistance and aging resistance. They feature stable chemical inertness and will not absorb water, expand or react with resin matrices and seawater. The beads can effectively enhance the waterproof performance, compressive toughness and structural rigidity of buoyancy composites, avoiding common problems such as water permeation, structural deformation and buoyancy attenuation in traditional marine materials.

These microspheres have good fluidity and dispersion, which can be evenly blended with epoxy resin, polyurethane and other composite substrates to form uniform and dense buoyancy materials. Widely used in deep-sea buoyancy blocks, underwater detection equipment, marine floating structures and offshore engineering components, they effectively extend the service life of marine products. With reliable pressure resistance and superior lightweight modification capability, high strength hollow glass microspheres have become indispensable functional fillers for modern deep-water and marine composite manufacturing.

Chemical composition(%):

SiO2	58-71
Na2CO3	12-25
B2O3	3-12
Al2O3	0-10
CaO	0.2-1.0
Fe2O3	0-0.5
MgO	0-0.05

Physical Index:

True Density	0.18-0.60g/cm3
Bulk Density	0.10-0.34g/cm3
Crush Strength	4-125Mpa/500-18000Psi
Survival	Min 90%
Flotation	Min 92%
Moisture	Max 0.5%
Particle Size	D50:20-70um
Max. Particle Size:	200um
Melting Point	1600°C

Specifiction：

Spec.	True Density(g/cm3)	Bulk Density(g/cm3)	Compressive strength(Mpa/Psi)	D50(um)	D90(um)	Packing(Kgs)
HL15	0.13-0.17	0.08-0.09	4/500	65	120	8
HL20	0.20-0.22	0.10-0.12	4/500	65	110	10
HL25	0.24-0.27	0.13-0.15	5/750	65	100	12.5
HL30	0.29-0.32	0.15-0.18	10/1500	55	85	15
HL32	0.31-0.33	0.17-0.19	14/2000	45	80	15
HL35	0.33-0.37	0.18-0.21	21/3000	40	70	15
HL38	0.37-0.39	0.19-0.22	38/5500	40	65	20
HL40	0.39-0.42	0.19-0.23	28/4000	40	70	20
HL42	0.41-0.44	0.21-0.24	55/8000	40	60	20
HL46	0.44-0.48	0.23-0.26	41/6000	40	70	22.5
HL50	0.48-0.52	0.25-0.27	55/8000	40	60	25
HL55	0.53-0.55	0.27-0.29	68/10000	40	60	25
HL60	0.58-0.62	0.29-0.34	83/12000	40	65	30
HL60S	0.58-0.63	0.30-0.34	125/18000	35	55	30
HS38	0.37-0.39	0.19-0.22	38/5500	30	50	20
HM10	1.4-1.6	0.45-0.50	193/28000	5	10	30
HM15	1.2-1.3	0.40-0.45	124/18000	7	15	30
HM20	1.05-1.15	0.39-0.44	124/18000	9	20	25
HM30	0.9-1.0	0.35-0.4	83/12000	14	30	25
HS20	0.18-0.22	0.10-0.12	7/1000	60	90	10
HS22	0.20-0.24	0.11-0.13	8/1200	45	70	10
HS28	0.27-0.30	0.15-0.17	28/4000	45	65	15
HS38	0.36-0.40	0.19-0.22	38/5500	30	50	20
HS42	0.40-0.44	0.21-0.24	55/8000	25	40	20
HS46	0.44-0.50	0.22-0.25	110/16000	20	30	22.5
HS60	0.58-0.62	0.29-0.33	193/28000	16	25	30
HS65	0.63-0.67	0.30-0.33	207/30000	13	20	32
HS70	0.75-0.80	0.33-0.35	207/30000	10	15	35

Application:

Lightweight cement, low-density oil well cementing slurry & low-density drilling fluids additive.
Low-density FRP(fiberglass-reinforced plastic), SMC, BMC composites.
Nylon, PA, PA6, PA66 for reducing weight.
Low-density adhesives & sealants.
Heat insulation paints and coatings.
Construction (reducing warpage/shrinkage).
Insulation and Buoyancy.
Artificial marble.

Hollow glass microspheres can be used in paint and coatings, construction sealant, rubber, plastic, FRP, artificial stone, putty and other products as filler and weight-reducing agent. The glass bubbles can also be used to produce high-strength, low-density cement slurry and low-density drilling fluid in oil and gas extraction industry. more and more industries now trying to testing the hollow glass spheres as additives to improve their products’ properties.

Package：

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Products

High Strength Hollow Glass Microspheres Glass Beads for Deep Water Buoyancy Composite and Marine Material

Chemical composition(%):

Physical Index:

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