Description

3.5H2O Zinc Borate is a high-performance, hydrated inorganic compound widely recognized for its synergistic flame retardant and smoke suppression properties. Its primary value lies in its ability to enhance fire safety in polymer composites while maintaining thermal stability and minimal impact on material properties. This product is essential for manufacturers in the plastics, rubber, coatings, and cable industries seeking halogen-free, environmentally friendly flame retardant solutions. Consistent quality and reliable supply are critical for maintaining production efficiency and meeting stringent safety regulations.

Application

• Halogen-Free Flame Retardant for Polymers: A key additive in polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), ethylene-vinyl acetate (EVA), and engineering plastics.
• Rubber Industry: Used in cables, conveyor belts, and other rubber goods to improve fire resistance.
• Coatings and Paints: Imparts flame retardancy to intumescent and decorative coatings for construction materials and textiles.
• Wood Composites and Adhesives: Enhances the fire safety of particleboard, plywood, and related adhesive systems.
• Ceramics and Glazes: Acts as a flux and can contribute to thermal properties in specialty ceramics.
• Synergistic Agent: Often used in combination with other flame retardants like aluminum trihydrate (ATH) or magnesium hydroxide to improve overall performance.

Basic Information

Product Name	3.5H2O Zinc Borate
CAS No.	12447-61-9
Molecular Formula	2ZnO·3B2O3·3.5H2O
Molecular Weight	434.66 g/mol
Synonyms	Zinc Borate Hydrate; Firebrake ZB; ZB 2335; Zinc Borate 3.5 Hydrate; Boron Zinc Oxide Hydrate; 2ZnO·3B2O3·3.5H2O; Zinc Borate (3.5H2O); FBZB
EINECS	Contact for details

Quality Control

Our 3.5H2O Zinc Borate is manufactured under a stringent quality management system to ensure batch-to-batch consistency and compliance with industrial specifications. Quality is verified through rigorous in-process and final product testing, including analysis of zinc oxide content, boron oxide content, and loss on ignition. A Certificate of Analysis (COA) detailing all relevant specifications is provided with each shipment to guarantee product integrity and support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); the container must be kept tightly sealed after initial use to prevent absorption of atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	White fine powder
Zinc Oxide (ZnO) Content	37.0 - 40.0 %
Boron Oxide (B2O3) Content	45.0 - 48.0 %
Loss on Ignition (LOI)	13.0 - 15.5 %
Particle Size (D50)	< 10 µm
Specific Gravity	2.8
Moisture Content	< 1.0 %

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.