SiO2 — Properties & Data | MatWorld

SiO2

ceramic

· SiO2

Silicon dioxide (SiO₂) is an inorganic ceramic compound that exists in both crystalline forms (quartz, cristobalite) and amorphous forms (silica glass). It is one of the most abundant and versatile ceramic materials, used across industries ranging from construction and electronics to optics and chemical processing. Engineers select SiO₂ for applications requiring chemical inertness, thermal stability, optical transparency, or dielectric properties, and it serves as a foundational material for advanced composites, coatings, and refractories where cost-effectiveness and processability are critical alongside moderate mechanical demands.

optical windows and lensessemiconductor device insulatorsrefractory liningsglass fibers and compositesthermal insulationchemical laboratory equipment

Compliance & Regulations

?Conflict Free?RoHS?REACH?TSCA?Prop 65

Units:

Property	Value	Unit	Conditions	Source
Bulk Modulus(K)3 entries	25.93	GPa	—
↳	12.87	GPa	—
↳	98.42	GPa	—
Elastic Compliance Tensor(Sij)	Matrix (redacted)	1/GPa	—
Elastic Anisotropy(AU)	0.9860	-	—
Elastic Stiffness Tensor(Cij)	Matrix (redacted)	Pa	—
Poisson's Ratio(ν)2 entries	0.06000	-	—
↳	0.1600	-	—
Shear Modulus(G)3 entries	32.32	GPa	—
↳	43.03	GPa	—
↳	82.41	GPa	—

N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form, heat treatment, basis, or test environment.

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Property	Value	Unit	Conditions	Source
Thermal Conductivity(k)	1.600	W/(m·K)	—

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Property	Value	Unit	Conditions	Source
Density(ρ)	2.138	kg/m³	—

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Property	Value	Unit	Conditions	Source
Band Gap(Eg)	5.621	eV	—
Dielectric Constant (Relative Permittivity)(εr)3 entries	4.208	-	—
↳	3.052 range 2.211–3.894median of 2 measurements	-	—
↳	3.890 range 3.740–4.040median of 2 measurements	-	—
Magnetic Moment(μB)	0.000	µB	—
Piezoelectric Modulus(eij)2 entries	0.04423	C/m²	—
↳	0.2604	C/m²	—
Piezoelectric Stress Tensor(eij)	Matrix (redacted)	C/m²	—
Seebeck Coefficient(S)	-153.8	µV/K	—

N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form, heat treatment, basis, or test environment.

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Property	Value	Unit	Conditions	Source
Energy Above Hull(ΔEhull)	0.03120	eV/atom	—
Formation Energy(ΔHf)2 entries	-3.138	eV/atom	—
↳	-2.870	eV/atom	—

N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form, heat treatment, basis, or test environment.

Verified Unverified Low confidence (<80%) Link to source

Regulatory Screening

Environmental

RoHS, REACH, and Prop 65 statuses are validated against official substance lists (ECHA SVHC Candidate List, OEHHA Prop 65, RoHS Annex II). Other regulations are estimated from composition and material classification. All screening is a starting point for due diligence — always verify with your supplier before making compliance decisions.