Na2Si3O7 — Properties & Data | MatWorld

Na2Si3O7

ceramic

· JVASP-49223· Na2Si3O7

Sodium silicate (Na2Si3O7) is an inorganic ceramic compound belonging to the silicate family, commonly known as waterglass when dissolved in aqueous solution. It is widely used in industrial adhesives, binders, and protective coatings due to its strong bonding properties and thermal stability. This material is valued in manufacturing for its role as a binder in foundry molds and cores, as a sealant in refractory applications, and as a component in detergents and chemical processing; engineers select it when cost-effective adhesion and high-temperature performance are priorities over premium mechanical strength.

foundry mold bindersrefractory coatingsindustrial adhesivessilicate-based cementsthermal insulation compositeschemical processing vessels

Compliance & Regulations

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

Units:

si imperial

Property	Value	Unit	Conditions	Source
Density(ρ)	0.1169	lb/in³	DFT · OptB88vdW

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Carrier

Property	Value	Unit	Conditions
Band Gap(Eg)	5.130	eV	DFT · OptB88vdW
High-Frequency Dielectric Constant (ε∞)(ε∞)	2.874	-	DFT · OptB88vdW
Magnetic Moment(μB)	0.000	µB	DFT · OptB88vdW
Thermoelectric Power Factor(PF)2 entries	0.000623	W/(m·K²)	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	0.000812	W/(m·K²)	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Seebeck Coefficient(S)2 entries	-97.10	μV/K	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	348	μV/K	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C

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)	0.05700	eV/atom	DFT · OptB88vdW
Formation Energy(ΔHf)	-2.668	eV/atom	DFT · OptB88vdW

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

Reference data from cited sources. Not verified or certified by MatWorld Inc. Verify against the source before use in design. Terms: engineering data

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.

Na2Si3O7

Physical Properties

Electrical Properties

Other Properties

Regulatory Screening

Environmental