Caustic Soda Flakes 98% / 99% (Sodium Hydroxide - NaOH China) 25kg Bag

Caustic Soda Flakes 98% NaOH – Sodium Hydroxide Flakes for Water Treatment & Industrial Cleaning (25Kg Bag)

Caustic soda flakes 98 (chemical designation: Sodium Hydroxide Flakes, molecular formula NaOH) is an essential, high-purity industrial alkaline compound directly imported from China. Manufactured under quality management systems certified to ISO 9001:2015, this premium naoh 98 china formulation delivers a guaranteed active alkali assay of minimum 98.0% Min. Characterized as opaque white flakes that exhibit strong hygroscopicity and highly exothermic dissolution in water, this heavy-duty caustic soda flakes 25kg bag functions as a versatile industrial caustic soda reagent for rapid wastewater neutralization, heavy metal precipitation, and saponification cleaning. Packaged in UN-certified dangerous goods packaging (5H3/Y26/S), it is the premier choice for manufacturing plants, textile mills, and municipal facilities looking to buy sodium hydroxide bulk at competitive wholesale prices.

Technical Specification Standards – Caustic Soda Flakes 98% (Standard Specifications)

Chemical Dynamics & Key Technological Advantages

• High Alkaline Potency (≥ 98.0% Min): Functioning as a strong, prototypical inorganic base, sodium hydroxide completely dissociates into univalent sodium cations (Na⁺) and hydroxyl anions (OH⁻) upon dissolution. The immediate availability of concentrated OH⁻ ions enables rapid, cost-efficient pH elevation in acidic streams, dramatically lowering chemical dosage compared to weaker alkaline alkalis or lime.
• Aggressive Saponification & Organic Emulsification: Hydroxyl ions rapidly hydrolyze ester bonds within animal and vegetable triglycerides, oils, greases, and organic biological deposits (saponification reaction). This converts insoluble fats into water-soluble sodium carboxylate soaps, thoroughly cleaning internal pipe walls, industrial machinery, and process tanks.
• High-Solubility Flake Morphology: Compared to liquid caustic solutions (32% or 50% NaOH) that incur high transportation costs for water content, solid 98% flakes offer 100% active substance efficiency. The dry, thin flake profile dissolves rapidly in agitated dissolving tanks and allows precise gravimetric batch measuring without dusting issues.
• UN-Certified 5H3/Y26/S Heavy-Duty Packaging: Sodium hydroxide is intensely hygroscopic and susceptible to atmospheric carbonation. The standardized 25.0 kg package features a multi-layer composite barrier: an outer high-tensile woven polypropylene bag paired with an inner virgin polyethylene liner, preventing atmospheric moisture ingress, caking, and chemical degradation during transit and storage.

Core Industrial Applications of Caustic Soda Flakes 98%

Engineered for high-efficiency chemical neutralization and saponification, caustic soda flakes 98 serves critical roles across primary manufacturing sectors:

• Wastewater Treatment & Effluent Neutralization:
  • Neutralizes acidic wastewater streams generated by electroplating, textile wet processing, chemical synthesis, and metallurgy plants.
  • Generates an alkaline environment to precipitate toxic heavy metal ions (Iron Fe, Aluminum Al, Copper Cu, Chromium Cr) as insoluble metal hydroxides prior to secondary coagulation with PAC and clarifying sedimentation.
• Textile & Wet Processing Industry:
  • Scouring: Strips natural pectins, waxes, and lubricating greases from raw cotton greige fabrics before bleaching and dyeing.
  • Mercerization: Immersing cotton fabrics in concentrated caustic soda solution causes cotton fibers to swell, permanently enhancing tensile strength, fabric luster, dimensional stability, and dye affinity.
• Pulp & Paper Manufacturing: Acts as a primary chemical cooking agent in the Kraft pulping process to depolymerize and dissolve natural lignin binders from cellulose wood chips, liberating pure pulp fibers and facilitating pulp bleaching.
• Soap, Detergents & CIP Chemical Formulations: Primary reactant in fat saponification to produce solid bar soaps, heavy-duty industrial degreasers, commercial CIP (Clean-In-Place) detergents for dairy and brewery facilities, and drain clearing formulations.
• Bauxite Refining & Metal Surface Preparation: Extracts alumina (Al₂O₃) from raw bauxite ore via the industrial Bayer process; serves as an alkaline degreasing bath to remove rust, drawing oils, and surface oxides from steel parts prior to electroplating.

Technical Dosing Guidelines, Safe Dissolution & Storage Protocols

• MANDATORY DISSOLUTION PROTOCOL (EXOTHERMIC HAZARD):
  • ALWAYS SLOWLY ADD CAUSTIC SODA FLAKES INTO WATER while continuously stirring to disperse generated heat. Dissolving solid NaOH in water is intensely exothermic (ΔH < 0), releasing significant thermal energy that can heat the solution near boiling temperatures.
  • NEVER ADD WATER DIRECTLY ONTO DRY CAUSTIC SODA FLAKES. Pouring water onto concentrated dry flakes triggers localized flash boiling and steam explosions, splattering boiling concentrated alkaline solution that causes catastrophic chemical burns.
• Equipment & Tank Metallurgy: Dissolve and store caustic solutions only in tanks, piping, and agitators fabricated from high-density polyethylene (HDPE), polypropylene (PP), PVC, or stainless steel (SUS 304/SUS 316). Never use aluminum, zinc, tin, or galvanized steel vessels, as caustic soda aggressively attacks amphoteric metals to generate explosive hydrogen gas (H₂).
• Warehouse Storage Protocol (UN 1823 Class 8 PG II): Store bags on elevated pallets at least 20 cm above floors in a dry, well-ventilated dedicated warehouse with an intact roof. Protect strictly against water leaks and moisture.
• Chemical Segregation: Store strictly isolated from strong mineral acids (HCl, H₂SO₄, HNO₃), strong oxidizing agents, and reactive metals. Tightly reseal inner PE liners immediately after partial use to prevent rapid atmospheric moisture absorption, liquification, and carbonate crust formation.

Commercial Supply Policy at THP Chemical

Tan Hung Phu Chemical Co., Ltd. (THP Chemical) is a direct importer and wholesale distributor of Caustic Soda Flakes 98% (25kg Bag China) supplying municipal wastewater authorities, textile operations, and industrial manufacturing facilities nationwide[cite: 3]:

• Manufactured under quality management systems certified to ISO 9001:2015, guaranteeing verified active assay ≥ 98.0% Min.
• Original packaging: 25.0 KGS Net (Total Gross Weight: 25.1 KGS), designated product code CN NO. 82001, compliant with UN dangerous goods packaging standard 5H3/Y26/S.
• Comprehensive compliance documentation: Batch-specific Certificate of Analysis (COA), 16-section Material Safety Data Sheet (MSDS), and legal VAT invoices provided with each dispatch.
• Extensive inventories maintained at our central Ho Chi Minh City logistics center, supporting rapid palletized dispatch nationwide at competitive wholesale volume pricing.

Frequently Asked Questions (FAQ)

1. Why do industrial wastewater treatment plants prefer Caustic Soda Flakes 98% over hydrated lime?

While hydrated lime [Ca(OH)₂] has a lower raw material cost, its slow dissolution generates vast quantities of insoluble calcium sulfate/carbonate sludge, increasing filter press operating costs and clogging pipework. In contrast, 98% Caustic Soda Flakes dissolve completely, dissociate instantly for precise automated pH control, and produce significantly less inorganic sludge volume.

2. Why does the solution heat up and produce steam when dissolving caustic flakes?

Dissolving solid NaOH in water is a strongly exothermic process of hydration (ΔH < 0). The released hydration energy can rapidly drive water temperatures toward 80°C – 90°C, causing localized steaming that carries caustic aerosols. This is a natural physical reaction, underscoring the mandatory rule to slowly add flakes into cold water under mechanical agitation.

3. What does the dangerous goods packaging code 5H3/Y26/S signify?

This code certifies compliance with United Nations (UN) packaging standards: 5H3 designates a woven plastic bag with an inner plastic moisture-barrier liner; Y26 confirms the package satisfies tests for Packing Group II dangerous goods up to a maximum gross mass of 26 kg; and S indicates packaging designed specifically for hazardous solid substances, guaranteeing drop resistance and seal integrity against corrosive leaks.

4. Does THP Chemical provide batch COAs and commercial VAT invoices for bulk orders?

Yes. THP Chemical supplies batch-specific factory Certificates of Analysis (COA), 16-section MSDS sheets, and legal commercial VAT invoices with every wholesale.