Sodium Hydrosulfite Supplier in Malaysia
- Also known as
- Sodium Hydrosulphite
- Sodium Dithionite
- Hydros
- Na2S2O4
Sodium hydrosulfite supplier for dyehouses, pulp and paper mills, kaolin processors and effluent treatment plants in Malaysia. The chemical name is sodium dithionite (Na2S2O4, CAS 7775-14-6), the British spelling sodium hydrosulphite is common in local documents, and the shop floor calls it hydros.
It is a strong reducing agent, not one of the sulphite salts its name resembles. That matters commercially, because a bath written for a dithionite will not perform on a bisulphite or sulphite charge. Order the reducing agent by its own name and assay.
The two grades on the market are 85% and 88% minimum assay, both as white to off-white crystalline powder, with stabilised grades offered where a pack is drawn down slowly. Textile work covers vat and sulphur dyeing, reduction clearing and colour stripping. Pulp, kaolin, sugar refining, latex and plating effluent buyers take it for brightening and reduction duty.
Sodium hydrosulfite is moisture sensitive, so storage and pack integrity are worth stating with the enquiry alongside the grade, quantity and delivery location. Availability, packing and documentation are confirmed with the quotation.
- CAS number
- 7775-14-6
- Formula
- Na2S2O4
- Grade
- 85% min, 88% min, stabilised
- Appearance
- white to off-white crystalline powder with a faint sulphurous odour
Sodium Hydrosulfite grades and forms
We supply several forms to suit different formulating and dosing setups. If you need a size that is not listed, ask us.
| Grade | Form | Assay | Typical use | Packing |
|---|---|---|---|---|
| Sodium hydrosulfite 85% min | white to off-white crystalline powder | 85% minimum, the common general-purpose trade grade | Broad reducing and bleaching duty: clay and mineral brightening, effluent chrome reduction, reductive cleaning of vessels and lines, and general process reduction where the highest active content is not required. | Bag or drum packing is confirmed with the quotation. |
| Sodium hydrosulfite 88% min | white crystalline powder | 88% minimum, the higher-assay grade | Vat and sulphur dyeing, colour stripping and reduction clearing, where more active reducing power per charge shortens the dosing schedule and lowers the residue carried into the bath. | Bag or drum packing is confirmed with the quotation. |
| Stabilised sodium hydrosulfite | free-flowing crystalline powder | grade dependent; stated with the quotation | Sites that draw down a pack over weeks in a warm, humid store and need the material to hold its strength between batches rather than lose assay in an opened pack. | Bag or drum packing is confirmed with the quotation. |
How to buy sodium hydrosulfite from ChemTrade
Request a quote for sodium hydrosulfite
Use the form below to request a quotation. You can also email sales@chemtrademalaysia.com or send us a message on WhatsApp.
Specifications
| Parameter | Value | Method |
|---|---|---|
| Appearance | white to off-white crystalline powder | — |
| Chemical identity | sodium dithionite, sold in the trade as sodium hydrosulfite | — |
| CAS number | 7775-14-6 | — |
| Molecular formula | Na2S2O4 | — |
| Molecular weight | approximately 174 g/mol | — |
| Typical assay | 85% or 88% minimum according to the grade quoted; state the assay your process is written around | — |
| Odour | faint sulphurous odour, more noticeable on damp material | — |
| Chemical function | strong reducing agent, moisture sensitive in storage and in use | — |
| Solubility | soluble in water, and the solution loses strength on standing, so baths are made up fresh | — |
Sodium Hydrosulfite applications
Safety and handling
Keep packs sealed, cool, dry and well ventilated, away from moisture, acids, oxidising agents and heat sources. Wet or damp material degrades and can warm up, so keep packs off damp floors, do not return spilled powder to the pack, and clean spills dry. Store away from combustible material, rotate stored material rather than holding it long term, and follow the safety information issued with the grade quoted. Supply is subject to applicable requirements.
Common questions about sodium hydrosulfite
Is sodium hydrosulfite the same as sodium dithionite?
Yes, the same material. Sodium dithionite is the systematic chemical name and sodium hydrosulfite is the industrial trade name, with sodium hydrosulphite as the British spelling used across local textile and paper documents. All refer to Na2S2O4, CAS 7775-14-6.
Is sodium hydrosulfite the same as sodium metabisulfite or sodium sulphite?
No. Those are sulphite salts and this is a dithionite, a considerably stronger reducing agent with different dosing, storage and process behaviour. The names look alike and the chemistry does not, so order the sulphite you need by name rather than substituting one for another.
What is hydros powder?
Hydros, or hydro powder, is the shop-floor shorthand for sodium hydrosulfite in Malaysian and regional dyehouses. It is the same product, not a lower grade or a blend. State the assay you need so the shorthand does not leave the grade open in the enquiry.
Should I request the 85% or 88% grade?
The 88% grade carries more active reducing power per kilogram, which suits vat and sulphur dyeing, reduction clearing and colour stripping. The 85% grade is the usual general-purpose choice for clay brightening, effluent chrome reduction and reductive cleaning. Quote the assay your process recipe is written around.
Why does sodium hydrosulfite lose strength in store?
The powder reacts with moisture, including damp air in an opened pack, and loses assay as it does so. Damp material can also warm up, so packs are kept sealed, cool and dry, and spills are cleaned dry rather than washed. A stabilised grade is worth asking about where drawdown is slow.
What should a sodium hydrosulfite enquiry include?
Give the assay grade, quantity, pack format preference, delivery location and a short note on the process, whether that is dyeing, pulp or clay brightening, sugar decolourisation or effluent treatment. List any documents your quality system needs so the quotation covers them.