Zinc borate

Catalog NumberACM1332076-2

CAS Number1332-07-6 / 12513-27-8 / 12767-90-7

CategoryBoron Flame Retardant

Synonyms	Zinc borate;Boric acid, zinc salt
Molecular Weight	313.79
Molecular Formula	xZnO yB2O3 zH2O
SMILES	B([O-])([O-])[O-].B([O-])([O-])[O-].[Zn+2].[Zn+2].[Zn+2]
InChI	BIKXLKXABVUSMH-UHFFFAOYSA-N
InChI Key	1S/2BO3.3Zn/c2*2-1(3)4;;;/q2*-3;3*+2
Application	Antimicrobial, Flame Retardant
Notes	Zinc borate is an Inorganic salt of indefinite composition, contg. zinc oxide and boric oxide in various ratios Zinc borate uses and applications include: Flame retardant in plastics, paints, textiles; afterglow suppressant and synergist with antimony trioxide for fire protection in plastics; smoke suppressant; corrosionrust-inhibitive pigment in paints; fungistat; mildew inhibitor; medicine; antimicrobial in cosmetics Suggested storage of Zinc borate: Store in tightly closed containers in a cool, dry, and well-ventilated area

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Case Study

Preparation of Lightweight Flame-Retardant Cotton Fabric/Zinc Borate Composite Aerogels

Qin, Qin, et al. ACS Sustainable Chemistry & Engineering 8.28 (2020): 10335-10344.

This work reported the development of a novel composite aerogel material combining waste cotton fabric (WCF) with zinc borate (ZB) to create a lightweight, flame-retardant material.
Preparation: Waste cotton fabric was first purified using sodium chlorite treatment at 80°C and pH 4.5, followed by dissolution in a pre-cooled NaOH/urea aqueous solution. The cellulose solution was crosslinked with epichlorohydrin and transformed into hydrogel through water bath incubation. Zinc borate was subsequently incorporated via immersion in zinc nitrate solutions (3%, 6%, and 9% concentrations) followed by reaction with sodium tetraborate. The final composite aerogels were obtained through freeze-drying at -50°C under vacuum.
Key Results:
· Zinc borate particles were uniformly dispersed throughout the aerogel structure without compromising its porous architecture.
· Compressive strength increased dramatically from 0.028 MPa (pure WCF) to 0.70 MPa (WCF/ZB-9 composite).
· Exceptional flame retardancy: Heat release rate reduced from 190.70 W/g to 5.45 W/g, heat release capacity decreased from 12.1 kJ/g to 1.6 kJ/g, and total heat release reduced from 213 J/g/K to 7 J/g/K. The composite exhibited self-extinguishing properties and significantly suppressed heat release

Developing Eco-Friendly Flame-Retardant Regenerated Fibers Using Zinc Borate

Xu, Zhixi, et al. European Polymer Journal (2025): 114003.

The investigation proved the development of flame-retardant regenerated cellulose fibers using zinc borate as a green flame retardant additive. The research focused on creating sustainable flame-resistant fibers through a practical blending approach without requiring modifications to conventional spinning equipment.
Synthesis and Characterization: Flame-retardant fibers were produced using a dry-wet spinning process with reed pulp as the raw material and 1-allyl-3-methylimidazolium chloride ([Amim]Cl) as the solvent. Zinc borate was incorporated as the flame retardant additive during the spinning process. The resulting fibers were comprehensively characterized using SEM, EDS, and XPS. Performance evaluation included LOI testing, cone calorimeter, TGA, Raman spectroscopy, and FT-IR spectroscopy to understand the flame retardant mechanisms.
Key Results: Zinc borate demonstrated uniform dispersion within the fibers, achieving a 30.5% LOI value and self-extinguishing properties. The additive enhanced thermal stability and promoted formation of a protective inorganic char layer through decomposition into ZnO and B2O3, effectively suppressing heat and mass transfer.

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