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Polyethylene glycol monomethyl ether 2,000


  • Crystallization grade Polyethylene glycol monomethyl ether 2,000 for formulating screens or for optimization


  •  Sterile filtered solution
  • Formulated in Type 1+ ultrapure water: 18.2 megaohm-cm resistivity at 25°C, < 5 ppb Total Organic Carbon, bacteria free (<1 Bacteria (CFU/ml)), pyrogen free (<0.03 Endotoxin (EU/ml)), RNase-free (< 0.01 ng/mL) and DNase-free (< 4 pg/µL)


Polyethylene glycol monomethyl ether 2,000

Synonyms: Methoxy poly(ethylene glycol) 2,000 or mono-Methyl polyethylene glycol 2,000 or PEG MME 2,000, or MPEG
Formula Weight (Mw) ~ 2,000
CAS Number [9004-74-4]
EC Number 215-801-2
RTECS PE8271000
MDL Number MFCD00084416
Melting Point (starting material) 52-56°C
Appearance (Solution): Colorless to Light Yellow to Light Brown, Clear

Aldehyde None detected
Peroxide None detected

Measured Conductivity Range: 28.0 - 60.2 µS/cm at 25°C
Measured Refractive Index Range: 1.40105 - 1.40205 at 20°C

Sterile filtered solution (0.22 micron) in sterile PETG bottle, purged with dry argon.




50% w/v Polyethylene glycol monomethyl ether 2,000


200 mL



Support Material(s)

Certificate Of Analysis


1. Poly(ethylene) glycol monomethyl ethers - an alternative to poly(ethylene) glycols in protein crystallization. A. M. Brzozowski and S. P. Tolley. Acta Cryst. (1994). D50, 466-468.

2. Purification, crystallization and preliminary X-ray analysis of the catalytic domain of the Escherichia coli tRNase colicin D. K. Takahashi, T. Ogawa, M. Hidaka, K. Ohsawa, H. Masaki and S. Yajima. Acta Cryst. (2006). F62, 29-31.