Hollow Glass Microspheres for Automotive Compounds (SMC/BMC)

Hollow glass microspheres are high-performance lightweight functional fillers specially optimized for automotive SMC (Sheet Molding Compound) and BMC (Bulk Molding Compound) composite materials. With uniform spherical structure, ultra-low density and stable chemical properties, these rigid glass microspheres perfectly solve the weight, shrinkage and surface quality pain points of traditional automotive thermosetting composites, becoming an essential additive for lightweight automobile parts manufacturing.

In SMC and BMC formula modification, hollow glass microspheres can effectively reduce the overall density of composite materials. Replacing conventional heavy calcium powder, talc and other mineral fillers, it greatly lowers the weight of automotive plastic parts, helping vehicles achieve energy saving, emission reduction and mileage improvement. The regular spherical shape provides excellent lubricity and fluidity during mixing and molding, improving material filling performance and ensuring uniform molding for complex automotive structural parts.

This product significantly optimizes the physical properties of SMC/BMC automotive compounds. It effectively reduces molding shrinkage and thermal expansion coefficient, eliminating common defects such as surface warping, depression and cracking. Meanwhile, the microspheres enhance surface smoothness, flatness and dimensional stability of finished parts, delivering high-grade appearance that meets the fine spraying and surface finishing requirements of automotive exterior and interior components.

With outstanding weather resistance, aging resistance and corrosion resistance, hollow glass microspheres maintain stable performance in long-term complex driving environments. They do not react with polyester resin and curing agents, ensuring stable mechanical strength and durable service life of automotive composites. Widely applied in automotive body parts, interior trim, electrical insulating components and chassis protective parts, they are ideal lightweight modification materials for modern automotive SMC and BMC industry.

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

Hollow Glass Microspheres for Automotive Compounds (SMC/BMC)

Chemical composition(%):

Physical Index:

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