Description

Pentazinc Chromate Octahydroxide is an inorganic pigment and corrosion inhibitor primarily valued for its exceptional anti-corrosive properties in protective coatings. This compound acts as a highly effective, chromate-based passivator, forming a stable, protective layer on metal substrates to prevent oxidation and degradation. It is a critical raw material for formulators in the paints and coatings, aerospace, and automotive industries seeking to enhance the longevity and performance of their primer and anti-corrosive paint systems.

Application

• As a key anti-corrosive pigment in industrial primers and protective coatings for steel and aluminum.
• Formulation of high-performance coatings for the aerospace and aviation sectors, where extreme environmental resistance is required.
• Use in automotive primers and underbody coatings to prevent rust and corrosion.
• Component in marine paints and coatings for ships and offshore structures exposed to saltwater.
• Manufacturing of zinc-rich primers and other heavy-duty maintenance paints for bridges, pipelines, and industrial equipment.
• As a functional additive in certain plastic and polymer composites to impart corrosion inhibition.

Basic Information

Product Name	Pentazinc Chromate Octahydroxide
CAS No.	49663-84-5
Molecular Formula	Zn5CrO4(OH)8 or Zn5(CrO4)(OH)8
Molecular Weight	578.08 g/mol (approx.)
Synonyms	Zinc Chromate Hydroxide; Zinc Yellow; Zinc Chromate(VI) Hydroxide; Zinc Tetroxy Chromate; Basic Zinc Chromate; Anticorrosive Pigment ZPO; ZPZ; CI Pigment Yellow 36; C.I. 77955
EINECS	256-418-0

Quality Control

Our Pentazinc Chromate Octahydroxide is manufactured under strict process controls to ensure batch-to-batch consistency and performance. Quality is verified through a comprehensive suite of analytical tests, including assay, heavy metal limits, and specific pigment properties like oil absorption and particle size distribution. A Certificate of Analysis (COA) detailing all relevant specifications is provided with each shipment to guarantee compliance with your formulation requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area away from incompatible materials such as strong acids and reducing agents. Due to its properties as a strong oxidizer, keep away from heat, sparks, and combustible materials. Recommended storage temperature is 15-25°C.

Specification

Item	Specification
Appearance	Yellow powder
Identification (IR)	Conforms
Assay (as Zn5CrO4(OH)8)	≥ 95.0 %
Zinc (Zn) Content	55.0 - 60.0 %
Chromium (Cr6+) Content	Contact for details
Moisture (Loss on Drying)	≤ 2.0 %
Water Soluble Matter	≤ 1.0 %
Particle Size (325 mesh residue)	≤ 1.0 %
Oil Absorption	15 - 25 g/100g

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