KAl(SO4)2

ceramic

· KAl(SO4)2

Potassium alum (KAl(SO₄)₂·12H₂O) is an inorganic salt ceramic compound consisting of potassium, aluminum, and sulfate ions, typically encountered as colorless crystalline hydrate. Historically used as a mordant in textile dyeing, water purification coagulant, and food additive (E522 in some regions), it remains relevant in laboratory and industrial chemical processing where its mild acidity and solubility in water enable precise control of pH and particle precipitation. Engineers select it over newer alternatives primarily for cost-effectiveness, chemical stability, and well-established handling protocols in traditional processing workflows.

water treatment and clarificationtextile dye fixationlaboratory reagentfood processing additiveleather tanningpaper sizing

Compliance & Regulations

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

Units:

si imperial

Property	Value	Unit	Conditions	Source
Piezoelectric Modulus(eij)	0.1114	C/m²	—
Piezoelectric Stress Tensor(eij)	Matrix (redacted)	C/m²	—

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

Property	Value	Unit	Conditions	Source
Formation Energy(ΔHf)	-2.133	eV/atom	—

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.

KAl(SO4)2

Electrical Properties

Other Properties

Regulatory Screening

Environmental