Evonik MHOROMER® Ultra High Purity HEMA 2-Hydroxyethyl Methacrylate

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Evonik MHOROMER® Ultra High Purity HEMA 2-Hydroxyethyl Methacrylate (discontinued **)
Categories:	Fluid
Material Notes:	Application: Basic monomer for soft contact lenses. Appearance: Clear, colorless liquid. Odor: Ester-like CAS: 868-77-9 Information Provided by Evonik CYRO. The former Evonik Methacrylates business has been sold to Röhm GmbH, although this trade name was disontinued prior to the sale.
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Physical Properties	Original Value	Comments

Density	1.07 g/cc
Viscosity	5.0 cP @Temperature 30.0 °C
Molecular Weight	130.1 g/mol
Vapor Pressure	0.000100 bar @Temperature 20.0 °C

Chemical Properties	Original Value	Comments
Acid Value	<= 0.050	Rohm Method: STM 05 (acid-base titration, as MAAC)

Thermal Properties	Original Value	Comments
Boiling Point	250 °C @Pressure 0.1013 MPa
Flash Point	101 °C	DIN 51758

Optical Properties	Original Value	Comments
Refractive Index	1.453 @Temperature 20.0 °C

Component Elements Properties	Original Value	Comments
H2O, Water	<= 0.10 %	Rohm Method: STM 07 (K. Fischer)

Descriptive Properties
Color	max. 5	Rohm Method: STM 08 (Pt-Co)
Degree of Purity (%)	min. 99.6	Rohm Method: STM 13
Ethylene glycol dimethacrylate (%)	max. 0.1	Rohm Method: STM 03 (GC)
Heat of Polymerization (kJ/mol)	50
MEHQ	25-35	ppm, Rohm Method: STM 04 (Photometric)
Polyethylene glycol monomethacrylates (%)	max. 0.15	Rohm Method: STM 03 (GC)
Solidification Point (°C)	below -60

**
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