Sodium Lauryl Sulphate
CAS 151-21-3
| Product name | Sodium Lauryl Sulphate |
|---|---|
| Synonyms | SLS, sodium dodecyl sulfate, SLS powder, SLS needles, sodium lauryl sulphate powder |
| C.A.S. number | 151-21-3 |
| Molecular formula | CH3(CH2)11OSO3Na (C12H25NaO4S) |
| Molecular weight | 288.38 g/mol |
| Grade supplied against | Needles & powder, 90%+ |
| Appearance | White to cream or pale-yellow needles, flakes, crystals or free-flowing powder with a faint fatty or soapy odour. Needles and 90 %+ powder grades differ in particle form and bulk density, not in chemistry. |
| Product group | Surfactants & Oleochemicals |
| HSN code | 3402 39 00 |
| Country of origin | As stated on the producer’s documents for the lot supplied; confirmed at offer stage |
| Packing | 25 kg bag |
| Storage | Store in a cool, dry, well-ventilated place with the container tightly closed. Protect from sunlight and from moisture (powder cakes and lumps). Keep away from strong acids, strong bases and oxidising agents. Where the grade is self-classified as a flammable solid, store in a fireproof location away from heat and ignition sources and control dust (Loba Chemie SDS). Avoid dust generation during transfer. |
| S. No. | Test parameter | Specification | Method |
|---|---|---|---|
| 1 | Description | White to cream or pale-yellow needles, flakes, crystals or free-flowing powder with a faint fatty or soapy odour. Needles and 90 %+ powder grades differ in particle form and bulk density, not in chemistry. | Visual |
| 2 | Identification | Conforms to the substance supplied | Instrumental or chemical test, per method agreed |
| 3 | Assay / grade | Needles & powder, 90%+ | Titrimetry or instrumental, per method agreed |
| 4 | Physical state | Solid (needles, flakes or powder) | Visual |
| 5 | Solubility in water | Readily soluble. 130 g/L at 20 C (Loba Chemie SDS); 15 g/100 mL at 20 C and '1 g dissolves in 10 mL water, giving an opalescent solution' (PubChem/Merck). Solutions foam strongly. | Per the test method agreed |
| 6 | pH | 8.5 to 10.5 in a 1 % w/w aqueous solution at 20 C (Loba Chemie SDS). Other SDS state only 'slightly alkaline' with no concentration given (Spectrum Chemical). Mildly alkaline in use dilutions. | Potentiometry on an aqueous suspension |
| 7 | Relative density | About 1.01 g/cm3 (Spectrum Chemical SDS); PubChem records 'greater than 1.1 at 68 F'. Loba Chemie's figure of 0.37 g/cm3 is a powder bulk density, not a true density - do not publish it as specific gravity. | Pyknometry or gas displacement |
| 8 | Melting / freezing point | 204-207 C (Loba Chemie and Spectrum Chemical SDS; PubChem/CRC give 204-205.5 C). The substance decomposes at or about its melting point. | Thermal analysis |
| 9 | Boiling point | Not available (decomposes before boiling) | Not applicable |
| 10 | Flash point | Not meaningful for this solid. Loba Chemie reports greater than 100 C (closed cup); Spectrum Chemical reports 'no data available'. Flash point is not the governing flammability property for a powder - the relevant question is whether it meets the Flammable Solids (H228) criteria, on which producers disagree (see ghs_hazards and un_number). | Closed cup |
| 11 | Additional parameters | To the specification agreed before order | As agreed |
Genuinely producer-dependent - both of the following are in current use and neither is wrong in itself: (a) UN 1325, and (b) not regulated. Loba Chemie declares UN 1325; Spectrum Chemical declares 'not regulated' for DOT, TDG, MEX, ICAO, IATA, IMDG, RID, ADR and ADN. · Class 4.1 (Flammable solid) where UN 1325 is declared; no class where the producer declares the material not regulated. · Packing group III where UN 1325 is declared (Loba Chemie); not applicable where the producer declares the material not regulated (Spectrum Chemical).
Proper shipping name: FLAMMABLE SOLID, ORGANIC, N.O.S. (Sodium lauryl sulphate) where UN 1325 Class 4.1 PG III is declared; otherwise 'Not regulated'. The divergence is real and traceable: only about 38.9 % of ECHA notifiers self-classify the substance as a flammable solid (H228), and that classification is what drives the Class 4.1 entry. Whether a given lot is a dangerous good therefore depends on the producer's own burning-rate test result for that grade and particle form. Declare transport on the basis of your own supplier's SDS and test data for the specific grade shipped, and do not copy one across from another producer.
Need this on your own enquiry, or need the producer’s batch certificate of analysis for a consignment? Email the sales desk or see what travels with the load.