Hexylene Glycol
(hex' il een glye' kol).
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118.172,4-Pentanediol, 2-methyl-, (±)-.
(±)-2-Methyl-2,4-pentanediol
[107-41-5].» Hexylene Glycol is 2-methyl-2,4-pentanediol.
Packaging and storage—
Preserve in tight containers.
USP Reference standards 
11
—
11—
USP Hexylene Glycol RS 
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Identification, Infrared Absorption 197F
, on undried specimen.
197F
, on undried specimen.
Specific gravity 841:
between 0.917 and 0.923.
841:
between 0.917 and 0.923.
Refractive index 831:
between 1.424 and 1.430.
831:
between 1.424 and 1.430.
Acidity—
Mix 1 mL of phenolphthalein TS with 50 mL of water, and add 0.1 N sodium hydroxide until the solution remains pink for 30 seconds. Add 10 mL of Hexylene Glycol, accurately measured, and titrate with 0.10 N sodium hydroxide until the original pink color returns and remains for 30 seconds: not more than 0.20 mL of 0.10 N sodium hydroxide is required.
Water, Method I 921:
not more than 0.5%.
921:
not more than 0.5%.
Auxiliary Information—
Please check for your question in the FAQs before contacting USP.
| Topic/Question | Contact | Expert Committee |
|---|---|---|
| Monograph | Robert H. Lafaver, M.S.
Scientific Liaison 1-301-816-8335 |
(EXC2010) Monographs - Excipients |
| Reference Standards | RS Technical Services 1-301-816-8129 rstech@usp.org |
USP35–NF30 Page 1817