Hexylene Glycol
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.
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.
Chromatographic Column—
| Topic/Question | Contact | Expert Committee |
| Monograph | Robert H. Lafaver, B.A.
Scientist 1-301-816-8335 |
(EM105) Excipient Monographs 1 |
| Reference Standards | Lili Wang, Technical Services Scientist 1-301-816-8129 RSTech@usp.org |
USP32–NF27 Page 1248
Chromatographic columns text is not derived from, and not part of, USP 32 or NF 27.