# Chemistry SDS and supplier-documentation gaps

**Audit date:** 2026-08-15

These are procurement/pre-experiment gates, not emergencies for materials that
have not been purchased. Do not fabricate or substitute SDS documents.

| Material | CAS / identity | Current status | Gate |
|---|---|---|---|
| Sodium acetate trihydrate | `6131-90-4` | Historical Alphachem SDS present; current lot SDS/CoA not yet recorded | Request current revision and lot documentation before formal stock intake |
| Anhydrous sodium sulfate | `7757-82-6` | SDS present | Record lot/CoA if used formally |
| Calcium chloride dihydrate | `10035-04-8` | No local SDS | Required before procurement or screening |
| Magnesium chloride hexahydrate | `7791-18-6` | No local SDS | Required before procurement or screening |
| Tetrasodium pyrophosphate decahydrate (TPD) | `13472-36-1` | No local SDS | Required before procurement or screening |
| Sodium tetraborate decahydrate (borax) | `1303-96-4` | No local SDS | Required before procurement or screening |
| Sodium chloride | `7647-14-5` | No local SDS | Required before hydrogel procurement/use if not already supplied |
| Sodium carboxymethyl cellulose (CMC-Na) | `9004-32-4` | No local SDS | Required before the post-nucleator CMC branch |

An SDS establishes handling identity and hazards; it does not replace a
lot-specific certificate of analysis or formal qualification.