Description

Zinc Borate 3.5 Hydrate is a versatile, multi-functional flame retardant and smoke suppressant additive. Its primary value lies in its synergistic effect with other flame retardants, enhancing performance while offering thermal stability and low toxicity. This compound is essential for manufacturers in the polymer, rubber, coatings, and construction materials industries seeking to improve the fire safety of their products. It is particularly effective as a partial replacement for antimony trioxide in halogen-containing systems.

Application

• As a synergistic flame retardant and smoke suppressant in PVC, polyolefins, engineering plastics, and elastomers.
• In halogen-free, intumescent fire-retardant coatings and paints for steel structures and wood.
• As an additive in adhesives, sealants, and cable compounds to meet stringent fire safety standards.
• For enhancing the fire resistance of textiles, fabrics, and wall coverings.
• In ceramic glazes and glass formulations as a flux and to modify thermal properties.
• As a corrosion inhibitor in anti-corrosive primer coatings.

Basic Information

Product Name	Zinc Borate 3.5 Hydrate
CAS No.	12513-27-8
Molecular Formula	2ZnO·3B2O3·3.5H2O
Molecular Weight	434.66 g/mol
Synonyms	Zinc Borate Hydrate; Firebrake ZB; ZB 2335; Boron Zinc Oxide Hydrate; 2ZnO·3B2O3·3.5H2O; Zinc Borate (3.5 Hydrate); FBZB
EINECS	235-736-7

Quality Control

Our Zinc Borate 3.5 Hydrate is manufactured under a strict quality management system to ensure batch-to-batch consistency and performance. Quality is verified through comprehensive analytical testing, including X-ray diffraction (XRD) for crystal structure and chemical assay. A Certificate of Analysis (COA) detailing purity, moisture content, and particle size distribution is provided with every shipment to guarantee compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive). Keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture, which can affect flow properties and performance.

Specification

Item	Specification
Appearance	White fine powder
Zinc Oxide (ZnO) Content	37.0 - 40.0 %
Boric Oxide (B2O3) Content	45.0 - 48.0 %
Loss on Ignition (LOI)	13.0 - 15.5 %
Particle Size (D50)	2 - 10 µm
Specific Gravity	2.8 g/cm³
Dehydration Temperature	> 290 °C

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