Caustic Soda Flakes NaOH 99% — Applications, Comparison with Pearls, and Pricing
5 Key Points to Remember:
- NaOH 99% flakes — thin solid flakes that dissolve faster than pearls
- Standard packaging: 25kg PP/PE bags, easy to transport and store
- 5 main applications: paper, textiles, water treatment, soap, chemical synthesis
- Store in dry conditions — NaOH is highly hygroscopic and reacts with atmospheric CO₂
- Loc Thien supplies NaOH 99% flakes — get pricing within 15 minutes via hotline 0979 891 929
What Are Caustic Soda Flakes?
Caustic soda flakes (NaOH) are solid NaOH produced by concentrating 50% NaOH solution until molten, then rapidly cooling on a rotating drum (drum flaker) to form thin solid layers. The solid NaOH layer is scraped off the drum surface as white-to-translucent flakes (0.5-2mm thick).
NaOH flakes contain ≥99% NaOH, with residual Na₂CO₃ (<0.5%), NaCl (<0.03%), and water (<0.5%). Bulk density ~2.13 g/cm³, melting point ~318°C. When exposed to humid air, flakes rapidly absorb moisture and deliquesce into concentrated NaOH solution — requiring airtight packaging.
Compared to 32-50% liquid NaOH, flakes offer lower transportation costs per ton of pure NaOH since no water is shipped. One ton of 99% flakes equals ~3.1 tons of 32% liquid NaOH in active content — particularly advantageous for remote factories or long-term storage.
Flakes vs Pearls: NaOH Solid Forms Comparison
The two common solid NaOH forms are flakes and pearls/prills. Both have ≥99% NaOH content but differ in morphology, dissolution rate, and preferred applications:
| Criteria | Flakes | Pearls/Prills |
|---|---|---|
| Morphology | Thin, irregular flakes (0.5-2mm thick) | Small, uniform spherical beads (0.5-1.5mm diameter) |
| NaOH Content | ≥99% | ≥99% |
| Dissolution Rate | Faster — larger surface area | Slower — lower surface-to-volume ratio |
| Dust Generation | Moderate (flakes break easily) | Lower (spherical beads generate less dust) |
| Caking Tendency | Higher in humid conditions | Better flow, less caking, suitable for automated dosing |
| Preferred Applications | Manual dissolution, batch production | Automated dosing systems, silo storage, precise metering |
| Relative Price | 5-10% lower | Higher |
| Standard Packaging | 25kg PP/PE bags | 25kg PP/PE bags |
Practical Selection: Factories manually dissolving NaOH in batches typically choose flakes for lower cost and faster dissolution. Facilities with automated dosing systems and silos prefer pearls to prevent feeder clogging and ensure consistent flow.
5 Key Industrial Applications of NaOH Flakes
1. Pulp & Paper (Kraft Process)
NaOH flakes are essential for kraft pulping — producing over 80% of global pulp. At 150-170°C under high pressure, NaOH breaks down lignin in wood chips while preserving cellulose fibers. A typical pulp mill consumes 200-400 kg NaOH per ton of pulp. Flakes are preferred for on-site dissolution into cooking liquor (white liquor), reducing transportation costs versus liquid NaOH.
2. Textile Dyeing — Fabric Treatment
In cotton mercerization (20-25% NaOH), fibers swell to increase luster, tensile strength, and dye affinity. Flakes are dissolved on-demand for precise concentration control. NaOH also removes sizing agents and natural impurities (pectin, wax) from raw cotton before dyeing.
3. Wastewater Treatment & pH Adjustment
NaOH flakes are cost-effective for pH elevation or acid neutralization in wastewater plants. Compared to 32% liquid NaOH, flakes reduce transportation weight by 60% and eliminate bulky storage tanks. Facilities only need small dissolving tanks to prepare 5-10% solutions before dosing. Note: Dissolution is highly exothermic — stirring and cooling are required for large batches.
4. Soap & Detergent Production
NaOH is irreplaceable for saponifying fats/oils into hard bar soap. Each ton of oil requires ~140-150 kg pure NaOH (varies by saponification value). Small-to-medium soap producers favor 25kg flakes for convenient batch dosing and competitive pricing.
5. Intermediate Chemical Synthesis
Flakes are feedstock for industrial chemicals: NaOCl (bleach) from NaOH + Cl₂, Na₃PO₄ from NaOH + H₃PO₄, sodium silicate from NaOH + SiO₂, Na₂S from NaOH + S. Chemical plants typically purchase flakes in bulk (10-20 tons/month), dissolving them into 50% NaOH for various synthesis processes.
Storage & Handling Guidelines for NaOH Flakes
Storage: Flakes absorb moisture and CO₂, forming surface Na₂CO₃ that reduces activity and causes caking. Reseal bags immediately after use. Store in dry, ventilated areas below 35°C. Never place bags directly on damp concrete — use wooden/plastic pallets (minimum 15cm clearance).
Safety: Solid and dissolved NaOH severely corrode skin and eyes. Mandatory PPE: chemical goggles, butyl/neoprene gloves, long-sleeved coveralls, boots. When dissolving flakes: always add NaOH to water (never reverse), stir continuously, use heat-resistant containers (localized boiling may occur).
Spill Response: Collect dry spills with plastic scoops/brushes (avoid bare metal tools — NaOH reacts with Al, Zn). Neutralize residue with dilute acid (5% HCl or CH₃COOH), then rinse thoroughly with water.
Chemical Incompatibility: Keep away from strong acids, light metals (Al, Mg, Zn), ammonium compounds — reactions generate hazardous heat/gas (H₂ with metals, NH₃ with ammonium salts). Never use CO₂ or water extinguishers on NaOH fires.
NaOH 99% Flakes Pricing at Loc Thien
Loc Thien supplies NaOH 99% flakes in double-layer 25kg PP/PE bags — sourced from leading Asian chlor-alkali producers. Available at 6 nationwide warehouses, with 24-hour delivery for Binh Duong, Dong Nai, Ho Chi Minh City, and neighboring provinces.
Pricing fluctuates with NaCl and energy markets, updated weekly. Orders ≥1 ton receive volume discounts. Each batch includes:
- COA (Certificate of Analysis): Actual NaOH, Na₂CO₃, NaCl, Fe content
- MSDS (Material Safety Data Sheet): Full GHS-compliant safety guidelines
- VAT invoices & delivery documents for corporate compliance
Loc Thien’s 20-truck fleet delivers directly to factory warehouses — no middlemen, ensuring quality from storage to point-of-use.
Frequently Asked Questions
Can NaOH flakes replace liquid NaOH?
Yes. 1 kg 99% flakes + 1.02 kg water = 2.02 kg ~49% NaOH, equivalent to 50% liquid. Factories switching from liquid to flakes need dissolving tanks, agitation systems, and alkali-resistant pumps. Transportation cost per ton of pure NaOH drops 50-60% versus 32% liquid.
Can caked NaOH flakes still be used?
Caked NaOH retains active content but is harder to remove from bags and dissolves slower. Caking usually indicates breached packaging. Lightly tap bags to separate flakes before opening. For automated systems, caked NaOH causes clogging — switch to pearls if recurring.
Can flakes replace Na₂CO₃ for pH adjustment?
Yes, and often more efficiently. NaOH is far more alkaline than Na₂CO₃ per unit mass — requiring less chemical to reach target pH. However, NaOH raises pH faster and is harder to control than Na₂CO₃ (a buffer). For sensitive systems (aquaculture, bioreactors), Na₂CO₃ is safer.
What is NaOH flakes’ shelf life?
Under proper storage (sealed bags, dry warehouse, <35°C), flakes maintain quality for 12-18 months post-production. Beyond this, Na₂CO₃ may increase slightly from CO₂ absorption, but NaOH remains >97% — suitable for most industrial applications.
How to order NaOH 99% flakes from Loc Thien?
Call 0979 891 929 — sales staff quote within 15 minutes, confirm quantity and delivery schedule. Orders <5 tons in Binh Duong/Dong Nai/HCMC delivered same-day. New factory clients receive a free 25kg sample with COA for quality verification before long-term contracts.
Request Pricing & Place Orders
Hotline: 0979 891 929 — call now, specify quantity, receive pricing within 15 minutes.
NaOH 99% flakes in 25kg bags — weekly market-based pricing. Submit requests via hotline or email; Loc Thien advises on optimal solid NaOH type (flakes/pearls) based on your facility’s scale and dissolution methods.
LOC THIEN INVESTMENT DEVELOPMENT CO., LTD Address: Lot B1-4, Street 3, Tan Dong Hiep B Industrial Park, Di An, Binh Duong Phone: 0979 891 929 Website: hoachatlocthien.com