Soda Lime Borosilicate Hollow Glass Microspheres for Sealants and Adhesives

Soda Lime Borosilicate Hollow Glass Microspheres are high-performance lightweight functional fillers specially developed for various sealants and adhesives. Featuring a unique hollow spherical structure and stable soda-lime borosilicate glass composition, these microspheres integrate low density, high mechanical strength, excellent chemical inertness and outstanding dimensional stability, making them an ideal modification additive for silicone sealants, polyurethane adhesives, epoxy bonding agents and industrial caulking materials.

Different from conventional heavy mineral fillers, the ultra-light hollow structure effectively reduces the overall density of sealant and adhesive products, realizing lightweight formulation optimization. It significantly lowers material consumption, reduces product shrinkage and deformation during curing, and improves surface flatness and finished product yield. The smooth spherical particle shape ensures excellent fluidity and dispersion in colloid systems, avoiding agglomeration and sedimentation, which greatly enhances construction smoothness and coating coverage efficiency.

With stable borosilicate glass properties, the microspheres deliver superior water resistance, acid and alkali resistance, and aging resistance. They do not chemically react with adhesive and sealant substrates, effectively improving the weather resistance, thermal stability and anti-aging performance of cured products. Meanwhile, their rigid closed-cell structure optimizes the internal stress distribution of colloid layers, enhances bonding strength, crack resistance and impact toughness, and extends the service life of sealing and bonding structures in long-term outdoor and harsh working environments.

In addition, these hollow glass microspheres possess good thermal insulation and sound insulation performance, which can effectively reduce the thermal expansion coefficient of sealants and adhesives. They are widely applicable to architectural waterproof sealants, automotive bonding adhesives, electronic potting glues and industrial sealing materials. Eco-friendly, low-cost and highly adaptable, they have become essential high-performance fillers for upgrading the comprehensive quality of modern sealant and adhesive products.

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：

TDS not uploaded

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Products

Soda Lime Borosilicate Hollow Glass Microspheres for Sealants and Adhesives

Chemical composition(%):

Physical Index:

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