MPEG 550

CAS Number: 25322-68-3

MPEG 550 are used in a wide range of lubricant applications due to their low volatility, solubility in water, and natural lubricity. 
They are non-staining to metal parts, textiles, and clothing and can be burned away leaving minimal residue.

MPEG 550 is a mono-functional methoxylated PEG (550) methacrylate monomer that features excellent wetting, water solubility, low Tg, and fast surface cure.  
MPEG 550 is recommended as a versatile intermediate for coatings and polymer modification.

Methoxy polyethylene glycols are addition polymers of ethylene oxide and methanol, represented by the generalised formula CH3O-(CH2-CH2-O)n-H, with Œn¹ indicating the average number of oxyethylene groups.

In chemical abstracts methoxy polyethylene glycols are described under the scientific name Poly(oxy-1,2-ethanediyl)-a-methyl-w-hydroxy in combination with the CAS register number 9004-74-4. 
Other names are polyethylene glycol monomethyl ether and methoxy polyethylene glycol.

Methoxy polyethylene glycols are available in average molecular weights ranging from 350 to 5000. 
All MPEGs are designated by a number indicating the average molecular weight. 

MPEG 350 and 500 are clear viscous liquids at room temperature but MPEG 750 and 1000 require a temperature above 40°C. 
MPEG 2000, 3000 and 5000 are white waxy solids that are supplied in flake form. 

Some grades may also be supplied in molten form. 
For special product demands, information on applications or other special requirements contact the local sales office.

All MPEGs are soluble in many polar solvents as aliphatic ketones, alcohols, glycol ethers, esters and aromatic hydrocarbons. 
MPEGs are readily miscible with water, the solid MPEGs are slightly less soluble in water with their solubility decreasing as molecular weight increases.

Properties of MPEG 550:
Quality Level: 200
vapor density: >1 (vs air)
vapor pressure: 0.05 mmHg ( 20 °C)
form: semisolid
mol wt: average Mn 550
refractive index: n20/D 1.455
viscosity: 7.5 cSt(210 °F)(lit.)
transition temp: Tm 20 °C
density: 1.089 g/mL at 25 °C
Ω-end: hydroxyl
α-end: methoxy
InChI: 1S/C3H8O2/c1-5-3-2-4/h4H,2-3H2,1H3
InChI key: XNWFRZJHXBZDAG-UHFFFAOYSA-N

Acidity (as acrylic acid): 0.01% MAX
Color (APHA): 50 MAX
Saponification Value (mg KOH/g): 82 MIN

Specifications of MPEG 550:
CAS Number: 25322-68-3
Grade: Technical
Appearance: liquid
Boiling Point: 200 °C (392 °F)
Color: Clear, Colorless
Density: 9.1600 lb/gal
Flash Point: 190 °C (374 °F)
Melting Point: 15 - 25 °C (59 - 77 °F)
Odor: mild
pH: 4.5 - 7.0
Recommended Use: Industrial chemical
Relative Density: 1.106 @ 20 °C (68 °F) Reference Material: (water = 1)

Functions of MPEG 550:
Chemical Intermediate, Low Volatility, Solubility In Water, Natural Lubricity

Benefits of MPEG 550:
Low toxicity

Marketing of MPEG 550:
Industrial Metalworking Fluids , Compressor Lubricants

Chemical Type of MPEG 550:
Polyethylene Glycol Methyl Ether

Synonyms of MPEG 550:
Methoxy poly(ethylene glycol)
mPEG
Polyethylene glycol monomethyl ether