CCHN ChemicalsChemical export sourcing from ChinaStart RFQ
Sodium Sulfite Na2SO3 CAS 7757-83-7 Industrial Grade sourcing visualCandidate for RFQ with document and spec verification
Back to sourcing hubWater Treatment

Sodium Sulfite Na2SO3 CAS 7757-83-7 Industrial Grade

Industrial grade sodium sulfite candidate, CAS 7757-83-7, Na2SO3, offered as powder with stated purity range 90%-99%. Buyer should verify grade, assay basis, impurity limits, packing, SDS/COA readiness, and export classification before RFQ confirmation.

Quick buying facts

Identify the grade, package, and import market before comparing suppliers.

Use this page to check the product identity, common specification points, document scope, package notes, and destination-market questions before sending a China sourcing request.

CAS 7757-83-7; formula Na2SO3; EINECS 231-821-4Inorganic salt; sodium sulfite powderCandidate for RFQ with document and spec verification
Identity and grade

Typical specifications

  • CAS 7757-83-7; formula Na2SO3; EINECS 231-821-4
  • Stated industrial grade purity range: 90%-99%
  • Appearance listed as powder; confirm color and particle profile
  • Request assay method and batch COA before order
  • Check limits for sulfate, chloride, iron, insolubles, moisture
Who uses this page

Target buyers

  • Industrial chemical distributors
  • Water-treatment chemical buyers
  • Textile and dyeing chemical purchasers
  • Pulp and paper chemical sourcing teams
  • Photo or process chemical formulators
Before matching

Documents to check

  • CAS number, grade, assay, and impurity profile
  • SDS, COA, TDS, HS code, and transport classification
  • Destination-market import documents before supplier matching
Package and route

Packing notes

  • Listed packing includes 1 kg bag and 25 kg drum
  • Confirm standard export packing and pallet options
  • Ask if 25 kg bags, drums, or jumbo bags are available
  • Verify moisture barrier, inner liner, and label language
  • Confirm sample packing, freight payer, and sample COA
Applications and sourcing options

Check whether this product fits the buyer's actual application.

Clear application, grade, package, and document notes help separate real sourcing demand from a vague price check.

Use context

Common applications

  • Oxygen scavenger or reducing-agent applications
  • Industrial water-treatment formulation input
  • Textile and dye process auxiliary sourcing
  • Pulp and paper process chemical procurement
  • General industrial formulation where specs are verified
How we compare

Sourcing options

  • Request 90%, 95%, 97%, or 99% assay quotation
  • Compare bag, drum, and palletized export packing
  • Ask for pre-shipment third-party inspection option
  • Source sample first for application compatibility checks
  • Bundle with related inorganic salts if supplier supports
Human review

Compliance notes

  • Request current SDS, COA, TDS, and packing list draft
  • Confirm HS code, export controls, and destination import rules
  • Verify DG status with SDS and carrier before shipment
  • Check any food, pharma, or water-treatment claims separately
  • Do not rely on marketplace ISO claim without certificate copy
Buyer search paths

Related sourcing terms

These terms support long-tail discovery while keeping the page focused on useful product and China export buying context.

sodium sulfite CAS 7757-83-7Na2SO3 industrial gradesodium sulfite powder suppliersodium sulfite COA SDSinorganic reducing salt
RFQ questions before supplier matching

Turn this product into a quote request.

Share target market, quantity, packaging scope, artwork status, delivery destination, and required documents so CHN Chemicals can prepare a cleaner supplier comparison.

Questions to confirm
  • What exact assay and grade can be supplied for this lot?
  • Can you share recent COA with impurity and moisture limits?
  • What packing sizes are available for export orders?
  • Is the shipment classified as DG or non-DG by your SDS?
  • What MOQ, lead time, Incoterms, and sample policy apply?
Checks before quote
  • Request current SDS, COA, TDS, and packing list draft
  • Confirm HS code, export controls, and destination import rules
  • Verify DG status with SDS and carrier before shipment
  • Check any food, pharma, or water-treatment claims separately
  • Do not rely on marketplace ISO claim without certificate copy
Next step

Send the product page with your target quantity and market. A sourcing manager can then confirm sample options, supplier fit, packaging details, and open document gaps.