Na4S2O5

ceramic

· JVASP-13359· Na4S2O5

Sodium pyrosulfite (Na₄S₂O₅), classified as an inorganic ceramic compound, is a white crystalline solid composed of sodium and sulfite ions. While primarily known as a chemical reagent rather than a structural ceramic, it finds use in industrial applications requiring sulfite chemistry, including water treatment, food preservation, and pulp bleaching processes. This material is not typically selected for load-bearing structural applications like traditional ceramics (alumina, silica), but rather for its chemical reactivity and ability to function as a reducing agent or preservative in aqueous and processing environments.

water treatmentfood preservationpulp and paper bleachingchemical processingwine and beverage preservationanalytical chemistry

Compliance & Regulations

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

Units:

si imperial

Property	Value	Unit	Conditions
Bulk Modulus(K)	5,830.5	ksi	DFT · OptB88vdW
Poisson's Ratio(ν)	0.2800	-	DFT · OptB88vdW
Shear Modulus(G)	3,083.5	ksi	DFT · OptB88vdW

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

Property	Value	Unit	Conditions	Source
Density(ρ)	0.09277	lb/in³	DFT · OptB88vdW

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

Filter by

Method

Carrier

Property	Value	Unit	Conditions
Band Gap(Eg)2 entries	2.484	eV	DFT · OptB88vdW
↳	4.401	eV	DFT · TBmBJ
Dielectric Constant (Relative Permittivity)(εr)	8.294	-	DFT · OptB88vdW
High-Frequency Dielectric Constant (ε∞)(ε∞)2 entries	3.068	-	DFT · OptB88vdW
↳	2.236	-	DFT · TBmBJ
Magnetic Moment(μB)	0.000	µB	DFT · OptB88vdW
Piezoelectric Modulus(eij)	0.2491	C/m²	DFT · OptB88vdW
Thermoelectric Power Factor(PF)2 entries	0.00141	W/(m·K²)	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	0.000771	W/(m·K²)	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Seebeck Coefficient(S)2 entries	-307.6	μV/K	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	377.1	μV/K	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Spectroscopic Limited Maximum Efficiency (SLME)(SLME)	0.000	%	DFT · TBmBJ

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)	0.1532	eV/atom	DFT · OptB88vdW
Formation Energy(ΔHf)	-1.622	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.

Na4S2O5 — Properties & Data | MatWorld

Na4S2O5

Mechanical Properties

Physical Properties

Electrical Properties

Other Properties

Regulatory Screening

Environmental