Sodium disulfite (CAS 7681-57-4) sourcing notes: practical points for Basic Chemical Raw Materials
Judging Sodium disulfite (CAS 7681-57-4) on a single number is how most mismatches start. In Basic Chemical Raw Materials incoming inspection we see the same bias repeatedly; this page untangles the logic behind it.
Basic specifications
| Name | Sodium disulfite |
|---|---|
| English name | Sodium disulfite |
| CAS No. | 7681-57-4 |
| Formula | Na2O5S2 |
| Molecular weight | 189.90 g/mol |
| Applications | Basic Chemical Raw Materials |
| Standard purity | per batch COA |
| Packaging | confirmed per order |
| Storage | keep sealed in a cool, dry place |
Figures above are published / typical information; final values follow the batch COA and order confirmation.
How it works
Industrially, the value of Sodium disulfite (CAS 7681-57-4) is rarely on the spec sheet — it is whether it stably meets your process window. In Basic Chemical Raw Materials, its purity, impurity profile and batch consistency usually matter more than a single ‘assay’ number, because what really moves the finished result is often the ignored impurities and physical properties. Comparable grades:
- Sodium Metabisulfite 7681 57 4/?lang=en：a comparable grade often evaluated alongside。
- Sodium Hyaluronate：a comparable grade often evaluated alongside。
- Sodium succinate：a comparable grade often evaluated alongside。
Key selection dimensions
- Define the end use and process window first, then work back to required purity and impurity limits — not the other way around.
- Check compatibility with other materials in the system; run a trial when unsure.
- Match packaging and feeding method to on-site equipment so the material is usable on arrival.
- Retain samples of critical lots and run third-party checks; do not rely on the supplier COA alone.
The easiest things to miss
Comparing price but not impurity profile: same assay with different impurities can yield wildly different results.
Skipping samples and scaling up: going straight to volume most often fails on compatibility.
Ignoring transport and storage: most ‘arrived-dead’ cases trace back to loose handling.
Q&A
Where is Sodium disulfite mainly used?
Mostly in Basic Chemical Raw Materials-related processes and formulations; the exact use depends on the finished product and process requirements.
How do I judge whether the specification fits?
State the use, process window and critical limits so the supplier can recommend a grade; when unsure, validate with a trial first.
Which quality documents come with Sodium disulfite?
A COA per batch, with MSDS / technical data sheet and third-party tests available on request; tell us at enquiry if a specific standard must be met.
Further reading
- Sodium Hyaluronate
- Sodium succinate
- Sodium hexafluorophosphate
- Sodium dihydrogen citrate Anhydrous
- Sodium citrate, anhydrous
See site search for sodium metabisulfite or browse the Organic Chemicals directory.
About supply & documents
Jinan Shenghe Chemical Co., Ltd. supplies chemical raw materials and fine chemicals; a COA ships with every batch, with MSDS and technical data sheets available on request. In your enquiry include product name, CAS, target purity and packaging, and we will provide documents and a quote to the relevant standard.
Contact: info@591daili.com | +86-18553102138
Note: This page is for industrial raw-material technical discussion only. Products are supplied for industrial and research use, not for consumer or medical use. Drinking-water, food, cosmetic or pharmaceutical applications must meet applicable regulations and customer standards; specifications, compliance documents and transport requirements follow the batch COA and order confirmation.