Caustic Soda Pearls are spherical, free-flowing beads of high-purity sodium hydroxide (NaOH) produced by prilling — a process that forms uniform, dust-free particles. Unlike caustic soda flakes, pearls offer superior flowability, reduced dust exposure during handling, and faster, more consistent dissolution rates. Moon Bright Resources supplies premium-grade caustic soda pearls with 99% minimum purity, low carbonate (≤0.4%) and ultra-low iron (≤5 ppm) content. Our pearls meet ISO and ASTM standards, making them the preferred choice for pharmaceutical manufacturing, high-end soap production, biodiesel plants, and water treatment facilities where precision and cleanliness are critical.
Characteristics & Specifications
| Parameter | Specification |
|---|---|
| Purity (NaOH) | 99.0% minimum |
| Appearance | White, spherical free-flowing beads (pearls) |
| CAS Number | 1310-73-2 |
| Molecular Formula | NaOH |
| Molecular Weight | 40.00 g/mol |
| Sodium Carbonate (Na₂CO₃) | ≤ 0.4% |
| Sodium Chloride (NaCl) | ≤ 0.03% |
| Iron (Fe) Content | ≤ 5 ppm |
| Heavy Metals (as Pb) | ≤ 3 ppm |
| Pearl Size | 0.5 – 2.0 mm (95% minimum) |
| Bulk Density | 0.9 – 1.1 g/cm³ |
| Solubility in Water | 1090 g/L (20°C) |
| pH (1% solution) | 13.5 – 14.0 |
| Dust Content | ≤ 0.1% (dust-free) |
| Standards Met | GB/T 209-2018, ASTM D456, ISO 980, USP-NF (on request) |
Advantages Over Caustic Soda Flakes
| Feature | Caustic Soda Pearls | Caustic Soda Flakes |
|---|---|---|
| Dust during handling | Minimal (dust-free) | Moderate to high |
| Flowability | Excellent (free-flowing) | Poor (may bridge) |
| Dissolution speed | Very fast | Moderate |
| Dosing accuracy | High (uniform size) | Variable (irregular flakes) |
| Caking tendency | Low | Moderate to high |
| Price | Slightly higher | Lower |
Applications
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Pharmaceutical Manufacturing: pH adjustment, API synthesis (USP grade available)
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Premium Soap & Cosmetics: High-end soap production requiring purity and consistency
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Biodiesel Production: Catalyst requiring precise dosing and minimal impurities
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Water Treatment: Municipal and industrial pH correction
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Food Processing: Food-grade applications (cocoa processing, soft drink pH adjustment)
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Chemical Synthesis: Production of sodium salts, organic intermediates
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Electronics Industry: PCB etching, semiconductor cleaning (low iron grade)
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Laboratory & Analytical: Reagent grade for research and quality control
Packaging Options
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25 kg multi-layer PP/PE bag with inner liner
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25 kg kraft paper bag with moisture barrier
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50 kg HDPE drum with desiccant
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500 kg FIBC (jumbo bag) with dust-proof liner
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1000 kg FIBC with moisture barrier
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25 metric ton bulk container liner
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Custom OEM packaging available
FAQ – Frequently Asked Questions
Q1: What is the advantage of caustic soda pearls over flakes?
A1: Caustic soda pearls offer several key advantages: they are dust-free (reducing worker inhalation risk and cleanup), flow freely without bridging in hoppers (enabling automated dosing), dissolve faster and more uniformly, and have lower caking tendency during storage. While pearls are slightly more expensive than flakes, the reduced handling costs, improved safety, and consistent performance often justify the premium — especially for automated processes and pharmaceutical applications.
Q2: How should caustic soda pearls be handled safely?
A2: Although pearls are dust-free, they remain highly corrosive. Always wear appropriate PPE including chemical-resistant gloves (nitrile or neoprene), safety goggles or full face shield, and protective clothing. Use in well-ventilated areas. Never add water to caustic soda — always add pearls slowly to cold water while stirring. Avoid contact with acids, aluminum, and organic materials. In case of skin contact, rinse immediately with plenty of water for at least 15 minutes. We provide Safety Data Sheets (SDS) with every shipment.
Q3: Do you offer OEM / private label packaging?
A3: Yes, Moon Bright Resources provides full OEM services for caustic soda pearls. We can package under your brand name with custom-printed bags (25 kg, 50 kg, or FIBCs), custom pearl size specifications (0.5-2.0 mm or tighter range), USP grade certification, and moisture-resistant packaging for tropical climates. Minimum OEM order quantity is 20 metric tons. We also offer custom repackaging for distributors and multilingual safety labeling for export markets.
Q4: What is your minimum order quantity (MOQ)?
A4: MOQ is 25 kg (one bag) for sample orders, 500 kg (20 bags) for small commercial orders, and 20 metric tons for wholesale pricing. Bulk orders of 20 metric tons or more (full container or truckload) qualify for discounted rates. For OEM private label orders, MOQ is 20 metric tons. USP/pharmaceutical grade requires a minimum of 5 metric tons.
Q5: How should caustic soda pearls be stored?
A5: Store in original tightly sealed containers in a cool, dry, well-ventilated area away from moisture and humidity. Pearls are less prone to caking than flakes but still require protection from moisture. Keep away from acids, aluminum, zinc, tin, and organic materials. Store on pallets away from concrete floors. Ideal storage temperature is 15-30°C with relative humidity below 60%. Shelf life is 24 months when stored properly. Partially used bags should be resealed immediately to maintain product quality.
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