Packaging and storage—
Preserve in tight containers, and store in a cool, dry place.
Labeling—
Label it to indicate the average nominal number of oxyethylene units.
Appearance of solution—
Dissolve 5.0 g of Polyoxyl Lauryl Ether in 50.0 mL of alcohol, and proceed as directed for
Appearance of solution under
Polyoxyl Stearyl Ether.
Identification—
B:
Dissolve or disperse 0.1 g in 5 mL of alcohol, add 10 mL of diluted hydrochloric acid, 5 mL of
barium chloride TS, and 10 mL of phosphomolybdic acid solution (1 in 10): a precipitate is formed.
Hydroxyl value 
401
:
within the ranges specified in the accompanying table.
Oxyethylene Units per
Molecule (Nominal Value) |
Hydroxyl Value |
| 3 |
165–185 |
| 4 |
145–165 |
| 5 |
130–140 |
| 9 |
90–100 |
| 10 |
85–95 |
| 12 |
73–83 |
| 15 |
64–74 |
| 20–23 |
40–60 |
Alkalinity—
Dissolve 2.0 g of Polyoxyl Lauryl Ether in a hot mixture of 10 mL of alcohol and 10 mL of water. Add 0.05 mL of
bromothymol blue TS, and titrate with 0.1 N hydrochloric acid to a yellow endpoint: not more than 0.5 mL of 0.1 N hydrochloric acid is required.
Limit of free ethylene oxide and dioxane—
Proceed as directed for
Limit of free ethylene oxide and dioxane under
Polyoxyl Stearyl Ether. Not more than 1 µg per g of free ethylene oxide is found; and not more than 10 µg per g of dioxane is found.
