Sodium Hydroxide Crystal: Purity 98-99% NaOH

Q: What is the main advantage of using sodium hydroxide crystals over liquid caustic soda?

Crystals offer higher purity (98-99% NaOH vs 50% in liquid), reduced transportation costs due to no water content, precise dosing capability, and better storage stability without crystallization issues in cold temperatures.

Q: How should sodium hydroxide crystals be stored safely?

Store in airtight containers in cool, dry areas below 40°C, away from acids and moisture. Use corrosion-resistant packaging (polyethylene or steel with proper lining) and implement spill containment measures due to the material's deliquescent and corrosive nature.

Q: What industries commonly use sodium hydroxide crystals?

Primary users include chemical manufacturing (especially for organic synthesis and inorganic compounds), pulp and paper production, textile processing, water treatment facilities, and soap/detergent manufacturing where controlled alkali addition is critical.

Component Specifications

Definition

Sodium hydroxide crystal, also known as caustic soda crystal, is a highly alkaline inorganic compound with the chemical formula NaOH. It exists as white, deliquescent crystalline solids that readily absorb moisture from air. In industrial applications, these crystals are produced through evaporation of sodium hydroxide solutions and are valued for their high purity (typically 98-99% NaOH) and controlled physical properties. They serve as a concentrated form of alkali for various chemical manufacturing processes where precise dosing and minimal water content are required.

Working Principle

Sodium hydroxide crystals function as a strong base in chemical reactions through dissociation into sodium (Na+) and hydroxide (OH-) ions when dissolved in water. The hydroxide ions act as proton acceptors, enabling neutralization of acids, saponification of fats and oils, hydrolysis of esters and amides, and pH adjustment in industrial processes. The crystalline form provides controlled solubility and reaction kinetics compared to liquid alternatives.

Materials

High-purity sodium hydroxide (NaOH) with typical composition: 98-99% NaOH, 0.5-1.5% sodium carbonate (Na2CO3), <0.1% sodium chloride (NaCl), <0.005% iron (Fe), and trace heavy metals. Physical form: orthorhombic crystalline structure, white opaque appearance, deliquescent properties.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Purity	98-99% NaOH
Bulk Density	1.1-1.3 g/cm³
Melting Point	318°C (604°F)
Moisture Content	<0.5%
Solubility In Water	111 g/100 mL at 20°C
Storage Temperature	Below 40°C in dry conditions
PH Of Saturated Solution	14
Particle Size Distribution	1-10 mm crystals

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

Standards

ISO 15547, DIN 19602, ASTM E291

Parent Products

This component is used in the following industrial products

Industrial Grade Sodium Hydroxide Flake

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

View Product Details

Engineering Analysis

Risks & Mitigation

Severe skin and eye corrosion
Exothermic reaction with water causing heat and splattering
Reactivity with acids producing hazardous gases
Environmental toxicity to aquatic life
Deliquescence leading to container corrosion

FMEA Triads

Trigger: Moisture ingress during storage
Failure: Caking and reduced flowability, partial dissolution creating concentrated caustic solutions
Mitigation: Hermetic sealing with desiccants, controlled humidity storage environments, regular container integrity checks

Trigger: Incompatible material contact
Failure: Violent exothermic reactions with acids, corrosion of aluminum and zinc containers
Mitigation: Segregated storage from acids and reactive metals, use of compatible polyethylene or properly lined steel containers

Trigger: Improper handling without PPE
Failure: Severe chemical burns to skin and eyes, respiratory irritation from dust
Mitigation: Mandatory use of chemical-resistant gloves, face shields, protective clothing, and respiratory protection during handling

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.5% NaOH content from specified purity, ±10% on particle size distribution

Test Method

Titration with hydrochloric acid for NaOH content (ASTM E291), sieve analysis for particle size, Karl Fischer titration for moisture content

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

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Inspection readiness

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Manufacturers of Sodium Hydroxide Crystal

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Frequently Asked Questions

What is the main advantage of using sodium hydroxide crystals over liquid caustic soda?