Safety data sheet for Sodium hydroxide
CAS 1310-73-2
This is the free preview of a draft SDS for Sodium hydroxide — Sections 1, 2 and 9, generated from the sources named below. The full 16-section draft, with your own company in Section 1, is $5 per document.
Typically documented by: Soap making (lye), drain cleaner, pH adjustment.
Draft safety data sheet — preview
Sections 1, 2, 9 of 16
- CAS number
- 1310-73-2
- Molecular formula
- NaOH
- Molecular weight
- 39.997 g/mol
- Signal word
- Danger
Hazard classification
- GHS05 — Corrosive
- H314: Causes severe skin burns and eye damage.
- H412: Harmful to aquatic life with long lasting effects.
Section 1 — Identification
1.1 Product identifier
Product identifier: Sodium Hydroxide
Chemical name (IUPAC): sodium hydroxide
CAS number: 1310-73-2
PubChem CID reference: 14798
Synonyms: SODIUM HYDROXIDE; Caustic soda; Sodium hydrate; Aetznatron; Soda lye; White caustic; Soda, caustic; Natriumhydroxid; Rohrputz; Plung
Section 2 — Hazards Identification
2.1 Classification of the substance or mixture
Classification basis: OSHA 29 CFR 1910.1200 Appendix A, aligned to the GHS Rev. 7 hazard classes this sheet resolves: Skin Corr. 1A, Aquatic Chronic 3.
Classification: Skin Corrosion, Category 1A (Skin Corr. 1A) [H314]
Classification: Hazardous to the Aquatic Environment, Long-Term Hazard, Category 3 (Aquatic Chronic 3) [H412]
2.2 Label elements
Signal word: Danger
GHS pictograms: GHS05 (Corrosion)
Hazard statement: H314: Causes severe skin burns and eye damage.
Hazard statement: H412: Harmful to aquatic life with long lasting effects.
Precautionary statement: P260: Do not breathe dust/fume/gas/mist/vapors/spray.
Precautionary statement: P280: Wear protective gloves, protective clothing, eye protection, face protection, and hearing protection.
Precautionary statement: P264: Wash hands thoroughly after handling.
Precautionary statement: P303+P361+P353: IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water or shower.
Precautionary statement: P305+P351+P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do - continue rinsing.
Precautionary statement: P301+P330+P331: IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.
Section 9 — Physical and Chemical Properties
9.1 Information on basic physical and chemical properties
Physical form: Solid
Appearance: White, orthogonal crystals
Odor: Odorless.
Boiling point: 1388°C (2530°F) at 1013 hPa
Melting point: 323°C (613°F)
Density: 2.13 g/cm³ at 25°C
Vapor pressure: 28 hPa at 25°C
Water solubility: Solubility in water, g/100ml at 20 °C: 109 (very good)
Viscosity: 4 cP at 350°C
pH: pH of a 0.05% wt/wt solution about 12; 0.5% solution about 13; 5% solution about 14
Not found in the public records searched: flash point, Log Pow (log Kow), vapor density, lower explosive limit, upper explosive limit and auto-ignition temperature. Enter these from your supplier's safety data sheet or your own test report before the draft is issued.
Occupational exposure limits for Sodium hydroxide
The airborne limits on public record in the United States. These are transcribed from the tables named in each row, not derived. The full draft puts them in Section 8 with the control and PPE guidance.
A ceiling limit must not be exceeded at any moment. It is not an average, so a short excursion above it is not offset by a lower reading later in the shift.
OSHA PEL — TWA (8 h)
2 mg/m³
OSHA Annotated PEL Table Z-1
NIOSH REL — Ceiling
2 mg/m³
NIOSH Pocket Guide to Chemical Hazards
Where each value came from
- Boiling point — Hazardous Substances Data Bank (HSDB)
- Haynes, W.M. (ed.) CRC Handbook of Chemistry and Physics. 91st ed. Boca Raton, FL: CRC Press Inc., 2010-2011, p. 4-90
- View the record
- Melting point — Hazardous Substances Data Bank (HSDB)
- Same reference as boiling point above.
- View the record
- Density — Hazardous Substances Data Bank (HSDB)
- Same reference as boiling point above.
- View the record
- Viscosity — Hazardous Substances Data Bank (HSDB)
- General Electric Co; Material Safety Data Sheet MSDS #3 (1984)
- View the record
- pH — Hazardous Substances Data Bank (HSDB)
- O'Neil, M.J. (ed.). The Merck Index - An Encyclopedia of Chemicals, Drugs, and Biologicals. Whitehouse Station, NJ: Merck and Co., Inc., 2006, p. 1485
- View the record
A value with no row here was assembled from more than one record, so no single record is credited for it. The draft you buy carries this table as an appendix covering all 16 sections.
Sources
- ECHA C&L Inventory — harmonised CLP entry
- Hazardous Substances Data Bank (HSDB)
- NIOSH Pocket Guide to Chemical Hazards
- OSHA Annotated PEL Table Z-1
- PubChem — GHS classification
- PubChem — compound record
- PubChem — names and identifiers
- PubChem — regulatory information
- PubChem — toxicity data
- PubChem — transport information
Sections 1.3 and 1.4 are withheld here because the supplier and emergency contact blocks carry your own company details in the draft you buy. Every draft needs review by a competent person before it is issued.
Measured values for Sodium hydroxide, and where each one comes from
22 measured values for 7 properties, read from 4 public databases. On 4 properties the records differ. Each reading is shown with its own record. Follow any record to read the value at its source.
Boiling point
4 records, 1388 to 1390 °C
Used with vapour pressure to judge how readily the substance reaches the air you breathe.
- 2534 °F
- NIOSH Pocket Guide
- 1388 °C @760 [mm Hg]
- PAC Chemical Database, U.S. Department of Energy
Melting point
4 records, 318 to 323 °C
Fixes the physical state at handling temperature, which the label and the transport class depend on.
- 605 °F
- NIOSH Pocket Guide
Vapour pressure
4 records differ
The higher it is, the faster the substance evaporates into the workplace air at room temperature.
- VP: 1 Pa at 513 °C; 10 Pa at 605 °C; 100 Pa at 722 °C; 1kPa at 874 °C; 10 kPa at 1080 °C; 100 kPa at 1377 °C
- Hazardous Substances Data Bank (HSDB)
- 1.82X10-21 mm Hg at 25 °C /extrapolated/
- Hazardous Substances Data Bank (HSDB)
- 0 mmHg (approx)
- NIOSH Pocket Guide
- 0 mmHg (approx)
- OSHA Occupational Chemical Database
Density
5 records differ
Needed to convert between mass and volume on the label, in transport papers and in a spill estimate.
- 2.13 g/cu cm 25 °C
- Hazardous Substances Data Bank (HSDB)
- 70-73 % solution: MP 62 °C; Density = 2.0 at 15.5 °C
- Hazardous Substances Data Bank (HSDB)
Solubility
3 records, each a different case
Determines spill behaviour, the right extinguishing media and the correct first-aid rinse.
- 1 g dissolves in 7.2 mL absolute alcohol, 4.2 mL methanol; also soluble in glycerol
- Hazardous Substances Data Bank (HSDB)
- 1 g dissolves in 0.9 mL water, 0.3 mL boiling water
- Hazardous Substances Data Bank (HSDB)
Viscosity
1 record
Governs how far a spill spreads and how fast it soaks into a surface or a sorbent.
- 4.0 cP at 350 °C
- Hazardous Substances Data Bank (HSDB)
pH
1 record
Drives the skin and eye corrosion classification for solutions, alongside the corrosivity data.
- pH of a 0.05% wt/wt solution about 12; 0.5% solution about 13; 5% solution about 14
- Hazardous Substances Data Bank (HSDB)
These are the public records read for Sodium hydroxide, published here unchanged. Where two records disagree, the draft you buy states the value and names the record behind it, so a reviewer can see what was chosen. Every draft needs review by a competent person before it is issued.
Get the full draft SDS for Sodium hydroxide
The draft covers all 16 sections under OSHA 29 CFR 1910.1200 and GHS Rev. 7, or the CLP EC 1272/2008 layout for the EU. Each draft arrives as an editable .docx and a PDF with an appendix naming the source of each value, in about 60 seconds. $5 per document, no account.