Editorial Technical Reference

Industrial Grade Sodium Hydroxide Flake

This page explains how Industrial Grade Sodium Hydroxide Flake is classified within Basic Chemical Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

Industrial grade sodium hydroxide flake is a fundamental alkaline chemical raw material produced through the electrolysis of sodium chloride brine.

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Product Specifications

Technical details and manufacturing context for Industrial Grade Sodium Hydroxide Flake

Definition
Industrial grade sodium hydroxide flake is a fundamental alkaline chemical raw material produced through the electrolysis of sodium chloride brine. These white, deliquescent flakes serve as a versatile base chemical in numerous manufacturing sectors. They function as a strong alkali for pH adjustment, saponification reactions, and organic synthesis intermediates. Primary applications include pulp and paper production, textile processing, water treatment chemicals, and soap manufacturing. The product is characterized by a minimum assay of 99.0% sodium hydroxide, with maximum impurities of 0.5% sodium carbonate, 0.02 ppm chloride, and 0.005 ppm iron, as per GB/T 209-2018. It has a bulk density of 0.8–1.0 kg/m³, a melting point of 318°C, a particle size of 2–5 mm, and a solubility in water of 1090 g/L at 20°C. Recommended storage temperature is 5–35°C, with a shelf life of 24 months when stored in sealed, dry conditions. Standard packaging is 25 kg woven bags with PE liner. The CAS number is 1310-73-2. This directory entry provides reference values; actual product specifications must be verified with the legal manufacturer or supplier for the specific model or application.
Working Principle
Provides hydroxide ions (OH⁻) in aqueous solution, acting as a strong base for neutralization reactions, hydrolysis, and catalytic processes in chemical manufacturing. When dissolved, it dissociates completely, raising pH and enabling reactions such as saponification of fats and oils, neutralization of acids, and precipitation of metal hydroxides. Its high alkalinity and solubility make it effective in adjusting pH in industrial processes, breaking down organic matter, and facilitating chemical synthesis. The flake form offers controlled dissolution and ease of handling in large-scale operations.
Common Materials
Sodium chloride brine, Deionized water
Technical Parameters
ParameterTypical rangeNotes & selection driver
NaOH PurityRequired≥99.0 %Minimum assay of sodium hydroxide contentGB/T 209-2018
Sodium Carbonate ContentRequired≤0.5 %Maximum allowable sodium carbonate impurityGB/T 209-2018
Chloride ContentRequired≤0.02 ppmMaximum chloride ion concentrationGB/T 209-2018
Iron ContentRequired≤0.005 ppmMaximum iron impurity concentrationGB/T 209-2018
Bulk DensityRequired0.8–1.0 kg/m³Apparent density of flake material
Melting Point318 °CTemperature at which flakes begin to fuse
Particle Size2–5 mmUniform size ensures consistent dissolution and handling.
Solubility in Water1090 g/LAt 20°C; high solubility for rapid solution preparation.
Storage Temperature5–35 °CAvoid high humidity and temperature to prevent caking.
Shelf Life24 monthsStable if stored in sealed, dry conditions.
Packaging25 kg/bagStandard woven bag with PE liner; custom available.
CAS Number1310-73-2Chemical identifier for regulatory compliance.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Sodium Hydroxide Crystal Part
    Primary active chemical component providing alkaline properties
    Material: NaOH
  • Surface Coating Optional Part
    Anti-caking agent to prevent flake agglomeration during storage
    Material: Food-grade stearate

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Industrial Grade Sodium Hydroxide Flake.

caustic soda flake NaOH flake lye flake sodium hydrate flake

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric for storage; system dependent for processing (typically 1-10 bar)
flow rate: System dependent; typical slurry handling: 0.5-3 m/s velocity
temperature: Ambient to 60°C (140°F) for storage; up to 100°C (212°F) in solution for processing
slurry concentration: Up to 50% w/w NaOH in water (handling dependent on temperature)
Media Compatibility
✓ Water treatment pH adjustment ✓ Pulp and paper processing ✓ Alumina production (Bayer process)
Unsuitable: Acidic environments or contact with acids (violent exothermic reaction)
Sizing Data Required
  • Required NaOH mass flow rate (kg/hr)
  • Final solution concentration (% w/w)
  • Process temperature and pressure conditions

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Corrosion-induced degradation
Cause: Sodium hydroxide's hygroscopic nature absorbs atmospheric moisture, forming a corrosive solution that attacks metal surfaces, especially aluminum and zinc, leading to pitting, thinning, and eventual structural failure.
Caking and bridging
Cause: Moisture absorption causes flakes to agglomerate into solid masses or form bridges in storage containers, obstructing flow, increasing handling stress, and potentially causing equipment jams or overpressure.
Maintenance Indicators
  • Visible white crystalline deposits or discoloration on storage containers or handling equipment, indicating moisture ingress and active corrosion.
  • Unusual resistance or noise during transfer operations (e.g., from hoppers or conveyors), signaling caking, bridging, or equipment degradation.
Engineering Tips
  • Implement strict moisture control: Use airtight, corrosion-resistant containers (e.g., polyethylene-lined steel), maintain storage areas below 40% relative humidity, and employ desiccants or inert gas blanketing.
  • Establish routine inspection and cleaning protocols: Schedule regular visual checks for corrosion or caking, and mechanically remove residues before they solidify, using compatible tools to prevent contamination.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 15547: Chemical products for industrial use - Sodium hydroxide ASTM E291-09: Standard Test Methods for Chemical Analysis of Caustic Soda and Sodium Hydroxide DIN 19602: Sodium hydroxide for industrial use - Technical delivery conditions

Quoted from the published standard.

Manufacturing Precision
  • Purity: ≥98.5% NaOH by mass
  • Chloride content: ≤0.05% by mass
Quality Inspection
  • Titration for NaOH concentration determination
  • ICP-OES (Inductively Coupled Plasma Optical Emission Spectroscopy) for trace metal impurities

Manufacturers of Industrial Grade Sodium Hydroxide Flake

Manufacturer profiles associated with Industrial Grade Sodium Hydroxide Flake.

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Frequently Asked Questions

What are the typical applications of industrial grade sodium hydroxide flakes?

They are used in pulp and paper production, textile processing, water treatment, soap manufacturing, and as a chemical intermediate in organic synthesis.

What purity and impurity limits are specified for this product?

According to GB/T 209-2018, the minimum NaOH assay is 99.0%, with maximum sodium carbonate 0.5%, chloride 0.02 ppm, and iron 0.005 ppm.

How should the flakes be stored to maintain quality?

Store in sealed, dry conditions at 5–35°C to prevent caking and moisture absorption. Shelf life is 24 months under these conditions.

Is the product available in custom packaging?

Standard packaging is 25 kg woven bags with PE liner; custom packaging may be available from the supplier, but must be confirmed directly.
Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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