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Zinc Borate

CAS： 12767-90-7 / 138265-88-0
MF： HXO

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HXO Zinc Borate Product Brochure

1. Basic Introduction

CAS No.: 12767-90-7 / 138265-88-0

EINECS No.: 235-804-2

Zinc Borate is a multi-functional boron-based flame retardant. It is white crystalline powder, insoluble in water, slightly soluble in hot water and dilute acid, stable in weak alkali, and soluble in strong alkali. Oil absorption value: 35g/100g.

2. Flame Retardant Mechanism

Release crystal water under high temperature, absorb heat and reduce surface temperature.

Water vapor dilutes oxygen and restrains combustion.

Form dense glassy B₂O₃ layer to isolate oxygen and heat.

Good synergistic effect with halogen, phosphorus and antimony series flame retardants, suppress free radical reaction, reduce smoke and prevent dripping.

3. Application

Widely used in plastic, rubber, wire and cable, coating, ceramic, wood and composite materials.

Synergistic flame retardant & smoke suppressant

Anti-dripping and arc resistance

Wood preservation and anti-corrosion

Ceramic glaze auxiliary agent

4. Product Classification

By Crystal Water Content

Model	Chemical Formula
FXL2335	2ZnO·3B₂O₃·3.5H₂O
FXL223	2ZnO·2B₂O₃·3H₂O
FXL23	2ZnO·3B₂O₃ (Anhydrous)

By Application Grade

Grade	Model
Electronic Grade	FXL2335-80SD, FXL23-70
Plastic Grade	FXL2335-400, FXL2335-80, FXL223-60
Rubber Grade	FXL2335-400X

5. Product Features & Application

Model	Feature	Application	Dosage
FXL2335-80SD	High purity, good thermal stability	Electronic sealing material	1–10%
FXL23-70	Anhydrous, high temperature resistance	High-temperature extrusion & injection	1–10%
FXL2335-400	General purpose, good dispersion	PVC, PP, PE, ABS, cable, coating	1–10%
FXL2335-80	High stability, high whiteness	Engineering plastic, coating	1–10%
FXL223-60	Low decomposition temperature	Low-temperature processing plastic	1–10%
FXL2335-400X	Anti-static, cost-effective	Rubber, conveyor belt, tire	1–10%

6. Technical Data Sheet

Item	FXL2335-80S	FXL23-70	FXL2335-400	FXL2335-80	FXL223-60	FXL2335-400X
D50 Particle Size (μm)	6.0–12.0	6.0–12.0	3.0–5.0	6.0–12.0	6.0–12.0	4.0–8.0
Surface Moisture (%) ≤	0.5	0.5	0.5	0.5	0.5	0.5
Whiteness ≥	95	90	95	95	96	90
ZnO (%)	37.0–39.5	43.0–46.0	36.5–39.5	36.5–39.5	44.0–47.0	34.5–40.0
B₂O₃ (%)	46.5–49.0	53.0–56.0	46.0–49.0	46.5–49.0	35.0–40.0	44.0–48.0
Loss on Ignition (%)	13.5–15.5	≤1.5	13.0–15.0	13.0–15.0	14.0–16.0	12.5–15.0
325 Mesh Residue (%) ≤	0.5	0.5	0.1	0.5	0.5	1.0
Pb (ppm) ≤	15	15	20	15	20	—
Cd (ppm) ≤	5	5	10	10	5	—
Fe (ppm) ≤	30	30	30	30	30	—
Melting Point (℃)	980	980	980	980	980	980