Anhydrous Sodium Sulphate Na₂SO₄ 99% (Glauber's Salt — 50kg Bag, ZDHC Level 1 Certified)
Bulk supply of Anhydrous Sodium Sulphate Na₂SO₄ ≥ 99% (Glauber's Salt, CAS 7757-82-6, 50kg bags) certified to ZDHC MRSL v3.1 Level 1 (Cert No. ZDHC1 127736 0003 Rev. 00 — TÜV SÜD). Technical quote within 15 minutes.
Anhydrous Sodium Sulphate Na₂SO₄ ≥ 99.0% (Glauber's Salt Anhydrous — CAS: 7757-82-6) is a high-purity neutral electrolyte engineered to promote reactive and direct dye exhaustion onto cotton/cellulose fibers, formulate synthetic detergents, cook Kraft pulp, and refine float glass batches. Loc Thien Investment Development Co., Ltd. (Tax ID: 0313650856) operates as a commercial industrial chemical supplier and distributor providing official Na₂SO₄ 99% (50 kg moisture-proof bags) certified to ZDHC MRSL Version 3.1 Conformance Level 1 (Cert No. ZDHC1 127736 0003 Rev. 00 | Report No. 2438023996) issued by TÜV SÜD Product Service GmbH / TÜV SÜD Vietnam. Contact Hotline 0979 891 929 for a technical quotation within 15 minutes.
1. Technical Overview, Physicochemical Properties & ZDHC MRSL v3.1 Level 1 Certification of Na₂SO₄ 99%
In reactive dyeing of 100% cotton, viscose, rayon, and T/C or CVC blends at export-oriented FDI textile mills, Anhydrous Sodium Sulphate (Na₂SO₄ ≥ 99.0%, CAS 7757-82-6) serves as the benchmark neutral electrolyte replacing common salt (NaCl) whenever critical shade levelness (especially Turquoise, Navy, and Emerald shades) and corrosion protection of high-temperature SUS316L jet dyeing vessels are required.
Under the corporate supply framework of Loc Thien Chemical: Loc Thien is an industrial chemical supplier and commercial distributor with a system-wide supply capacity of 3,000+ tons/month (whereas Ferrous Chloride FeCl₂ 30% and wastewater-grade Ferric Chloride FeCl₃ are directly manufactured by Loc Thien). Our Sodium Sulphate (Na₂SO₄) holds an official ZDHC MRSL Version 3.1 Conformance Level 1 CERTIFICATE (Certificate No. ZDHC1 127736 0003 Rev. 00 | Analytical Test Report No. 2438023996) issued by TÜV SÜD Product Service GmbH / TÜV SÜD Vietnam to LOC THIEN INVESTMENT DEVELOPMENT COMPANY LIMITED.
2. Technical Specification Table & Batch COA Quality Control Limits (Na₂SO₄ ≥ 99%)
Every shipment of Anhydrous Sodium Sulphate Na₂SO₄ 99% dispatched from Loc Thien Chemical's 6 standardized warehouses is verified against strict laboratory specifications by our QC Engineers (Phan Cam Thuy and Vo Thi Nhu Hoa) and accompanied by a batch-specific Certificate of Analysis (COA):
| Parameter | Unit | Guaranteed Specification | Typical Batch COA Value | Analytical Method |
|---|---|---|---|---|
| Main Assay (as Na₂SO₄) | % w/w | ≥ 99.0% | 99.3% – 99.6% | Gravimetric BaSO₄ Precipitation (ASTM E538 / ISO 3237) |
| pH (1% w/v Aqueous Solution at 20 °C) | pH | 6.0 – 8.0 | 6.8 – 7.4 (Neutral) | Calibrated Glass Electrode pH Meter |
| Moisture (Loss on Drying at 105 °C) | % w/w | ≤ 0.20% | 0.08% – 0.14% | Gravimetric Drying Oven (2 hours) |
| Water Insoluble Matter | % w/w | ≤ 0.05% | 0.01% – 0.02% | 0.45 µm Membrane Filtration |
| Total Hardness (as Ca²⁺ + Mg²⁺) | % w/w | ≤ 0.10% | 0.02% – 0.04% | EDTA Complexometric Titration |
| Total Iron (Fe) | ppm (mg/kg) | ≤ 20 ppm | ≤ 8 ppm | 1,10-Phenanthroline Spectrophotometry (510 nm) |
| Chloride Content (as Cl⁻) | % w/w | ≤ 0.35% | 0.12% – 0.20% | Mohr Argentometric Titration |
| Whiteness (Hunter R457) | % | ≥ 88.0% | 90.5% – 92.5% | Photoelectric Reflectance Photometer |
| ZDHC MRSL v3.1 Compliance | Level | Conformance Level 1 | Cert No. ZDHC1 127736 0003 Rev. 00 |
TÜV SÜD Product Service GmbH |
3. Thermodynamic Mechanism in Reactive Cotton Dyeing & Why Na₂SO₄ Outperforms NaCl
When cellulose fibers (Cotton, Viscose) are immersed in a neutral dyebath, surface hydroxyl groups (Cell–OH) acquire a negative surface charge (negative Zeta potential, typically -20 mV to -35 mV). Since hydrolyzed reactive dye anions (D–SO₃⁻) also carry negative charges, electrostatic repulsion prevents dye molecules from approaching the fiber surface.
- Compression of the Electrical Double Layer (Zeta Potential Shielding): Dissociation of
Na₂SO₄ → 2Na⁺ + SO₄²⁻supplies a high concentration of sodium cations (Na⁺) that compress the Stern electrical double layer around cellulose fibers, allowing reactive dye molecules to adsorb evenly onto the fiber interior before alkali fixation with Soda Ash Light Na₂CO₃ 99.2%. - Eliminating Chloride Pitting Corrosion on SUS316L Jet Dyeing Machines: Unlike vacuum salt (
NaCl), which introduces aggressive chloride ions (Cl⁻) that cause stress-corrosion cracking and pitting on stainless steel heat exchangers and circulation pumps at 80–130 °C,SO₄²⁻ions are passivating and completely non-corrosive to SUS304/SUS316L equipment. - Superior Leveling on Phthalocyanine Turquoise & Brilliant Shades: Large-molecule copper phthalocyanine dyes (e.g., Reactive Blue 21 / Turquoise Blue G) aggregate rapidly in the presence of
Cl⁻, causing unlevel dyeing and salt spots. Divalent sulfate ions (SO₄²⁻) moderate the salting-out rate, ensuring uniform migration and high color reproducibility.
4. Industrial Application & Dosing Matrix for Na₂SO₄ 99%
| Industrial Sector | Specific Process | Recommended Dosage | Key Technical & Process Control Notes |
|---|---|---|---|
| Reactive Dyeing (Light / Pastel Shades) | Exhaustion dyeing of cotton knit/woven fabrics (< 0.5% o.w.f. dye) | 15 – 30 g/L | Dose in 2 portions at 60 °C prior to adding Soda Ash Light Na₂CO₃; maintain dyebath hardness < 50 ppm CaCO₃. |
| Reactive Dyeing (Medium Shades) | Exhaustion dyeing of cotton fabrics (0.5% – 2.0% o.w.f. dye) | 40 – 60 g/L | Pre-dissolve in side tank with warm water (40–50 °C) and filter through 100-mesh stainless screen before linear injection. |
| Reactive Dyeing (Dark / Navy / Black / Turquoise) | High-exhaustion dyeing (> 2.0% o.w.f. dye) & sensitive Turquoise shades | 70 – 90 g/L | Mandatory use of Na₂SO₄ 99% (instead of NaCl) for Turquoise Blue to prevent dye aggregation and fabric spotting. |
| Synthetic Detergent Manufacturing | Spray-dried washing powder & laundry detergent builder | 25% – 45% w/w of formula | Requires whiteness ≥ 90%, moisture ≤ 0.2%, and neutral pH to maintain free-flowing powder properties. |
| Kraft Pulp & Float Glass | Sulfate cooking liquor makeup & glass batch fining agent | 15 – 25 kg / ton product | Removes micro-bubbles (seeds) in molten glass and replenishes sodium/sulfur balance in Kraft recovery boilers. |
5. Quality Control Protocol at Loc Thien QC Laboratory & 6-Warehouse Logistics
Before dispatching any lot of Anhydrous Sodium Sulphate Na₂SO₄ 99%, Loc Thien's QC team (Phan Cam Thuy and Vo Thi Nhu Hoa) executes a 4-stage inspection: (1) 50 g/500 mL optical transmittance & insoluble residue check (≤ 0.02%); (2) EDTA hardness (Ca²⁺ + Mg²⁺ ≤ 0.04%) & Phenanthroline iron check (Fe ≤ 10 ppm); (3) 1% solution pH (6.5–7.5) & moisture verification (≤ 0.20%); and (4) matching batch COA with our official TÜV SÜD ZDHC MRSL v3.1 Level 1 Certificate (#ZDHC1 127736 0003 Rev. 00).
5 Key Pricing Factors & 15-Minute Quotation Policy: In accordance with our B2B transparency standards, unit pricing is tailored to: (1) Order volume (pallet load vs. full container/truckload); (2) Packaging format (50 kg PE-lined PP bags vs. 1,000 kg Jumbo bags); (3) Delivery destination across our 6 standardized warehouses (Ba Ria - Vung Tau Phu My 1 IP, Dong Nai Long Thanh IP, Binh Duong Di An City, Da Nang Hoa Khanh IP, Can Tho Tra Noc IP, and Bac Ninh Tien Son IP — Legal Head Office at 452/6B Tinh Lo 10, Binh Tri Dong Ward, Binh Tan District, HCMC); (4) Delivery SLA (4 hours within HCMC, 24–48 hours across Southern & Mekong Delta IPs, 2–3 days across Northern & Central IPs — Contact hotline 0979 891 929 for detailed delivery procedures); and (5) Bundled supply with our other ZDHC Level 1 textile chemicals (Soda Ash Light Na₂CO₃, Liquid Caustic Soda NaOH 32%, Hydrogen Peroxide H₂O₂ 50%, and ZDHC MRSL v3.1 Compliance Guide). Contact 0979 891 929 or [email protected] for a technical quote within 15 minutes.
6. Frequently Asked Questions (FAQ) — Anhydrous Sodium Sulphate Na₂SO₄ 99%
Q1: Does Loc Thien's Sodium Sulphate (Na₂SO₄ 99%) hold ZDHC MRSL v3.1 Level 1 certification?
A: Yes. Sodium Sulphate (Na₂SO₄) supplied by Loc Thien Investment Development Co., Ltd. holds an official ZDHC MRSL Version 3.1 Conformance Level 1 CERTIFICATE issued by TÜV SÜD Product Service GmbH / TÜV SÜD Vietnam (Cert No. ZDHC1 127736 0003 Rev. 00 | Report No. 2438023996).
Q2: Why should textile dyeing mills choose Na₂SO₄ 99% over vacuum salt (NaCl)?
A: Anhydrous Sodium Sulphate Na₂SO₄ 99% prevents chloride (Cl⁻) pitting corrosion on high-temperature SUS316L jet dyeing vessels, prevents dye aggregation on sensitive Turquoise Blue phthalocyanine shades, and meets global brand ZDHC MRSL v3.1 Level 1 audit requirements.
