Sodium Sulphate 99% — Anhydrous Na₂SO₄ for Detergents, Pulp & Glass

Product overview

Anhydrous sodium sulphate — Na₂SO₄ in its water-free, white crystalline form — is a high-volume inorganic salt traded globally as both a primary product and a co-product of viscose rayon, lithium extraction and Mannheim furnace operations. Unlike hygroscopic soda ash, sodium sulphate remains stable in bulk storage and flows freely through pneumatic conveying lines, which makes it the standard inert filler in spray-dried laundry powders where it dilutes active surfactant without adding moisture to the formulation. Our export grade at 99% Na₂SO₄ with iron capped at 0.002% meets the purity thresholds detergent compounders and kraft pulp mills specify for white-product applications.

Primary demand channels include synthetic detergent plants where Na₂SO₄ acts as a processing aid and bulking agent in LAS and zeolite-based powders, sulphate kraft pulp mills recovering cooking chemicals in the white-liquor cycle, container and flat glass furnaces where sodium sulphate supplements soda ash as a fining and fluxing agent, textile dye houses using Glauber's salt levelling baths for even colour uptake, and battery recyclers precipitating lead sulphate during acid recovery. Typical buyers are regional detergent compounders between own surfactant plant turnarounds, integrated pulp mills topping up merchant sulphate when recovery boiler output dips, glass producers adjusting batch alkalinity, and traders building inventory ahead of monsoon-season detergent demand in South Asia.

Supply origins include viscose rayon and chemical complexes at Black Sea and MENA hubs with established bulk loading terminals and container stuffing lines for big-bag export. Anhydrous grade is the preferred sodium sulphate form wherever freight cost per unit of active Na₂SO₄ and silo storage stability matter more than the controlled heat of hydration offered by decahydrate Glauber's salt. HS code 2833.11. MOQ from 500 MT on FOB, CFR or CIF terms.

Full specification

Loading ports & logistics

Sodium sulphate is a dry, free-flowing bulk solid that tolerates ambient humidity better than soda ash but still requires covered holds and dust-control measures during loading and discharge. We coordinate three principal delivery modes depending on parcel size and receiver infrastructure.

Geared bulk carriers load parcels of 3,000–25,000 MT at dedicated chemical and salt berths on FOB Black Sea and MENA origins. Pneumatic or grab discharge at the destination requires covered silos or warehouse space — fine sulphate dust can create housekeeping issues on open quaysides and must be managed with extraction systems at the receiver.

1-tonne PP big bags in 20-foot containers hold approximately 20–24 MT net per unit and suit mid-size buyers without deep-water bulk terminals. Bags are palletized and stretch-wrapped for the sea leg. Ideal for parcels of 500–2,500 MT assembled across multiple container bookings on FOB or CFR terms.

Break-bulk coaster vessels move 500–3,000 MT big-bag parcels on short-sea routes to Mediterranean, Red Sea and Indian Ocean discharge ports with geared crane facilities. FOB loading at exporter-nominated berth; CFR and CIF quotes include vessel freight, marine insurance and discharge-port equipment assessment before firm offer. Typical lead time 12–22 days from contract execution to loading window.

Packaging & documentation

Cargo ships as bulk sodium sulphate in vessel holds, 1-tonne laminated PP big bags with polyethylene inner liner, or 50 kg woven bags palletized for container export. Each lot is accompanied by a mill certificate of analysis showing Na₂SO₄, chloride, iron, moisture and water-insoluble results, safety data sheet (SDS) per GHS, commercial invoice, packing list, bill of lading and certificate of origin. Sodium sulphate content is confirmed by gravimetric precipitation as barium sulphate on the COA.

Third-party inspection (SGS, Bureau Veritas or equivalent) at loading can be arranged on buyer request. Big-bag integrity and moisture checks are included in the standard inspection scope for containerized shipments. We issue stowage instructions with the shipping package — sodium sulphate is non-hazardous but classified as a fine-powder cargo requiring dust suppression during mechanical handling.

FAQ

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