Ethylene Vinyl Alcohol copolymer (EVOH), a semi crystalline random copolymer of ethylene and vinyl alcohol, is widely and most commonly used in packaging structures for perishable food because of its superior barrier to oxygen. The high barrier performance of EVOH, even after abuse, has allowed for conversion from foil and metallized film laminations to co-extruded barrier films.
EVOH can easily be co-extruded with all types of polyolefins, polyamides and other materials using standard extrusion equipment. EVOH is a hydrophilic material, so EVOH resin must be dry prior to extrusion processing. EVOH resins have poor adhesion to most polymers, so functionalized adhesive resins, commonly called tie resins, are used to bond the EVOH layer to other polymer layers in packaging structures.
|
Grade
|
Ethylene Content
|
Density
|
Tm
|
Tg
|
MFI
|
OTR
|
Application
|
|
Mole %
|
g/cm3
|
¡ãC
|
¡ãC
|
g/10 min
|
|
|
|
EV2751F
|
27
|
1.19
|
190
|
63
|
4
|
0.1
|
Cast film, Blown film
|
|
EV2904 F or V
|
29
|
1.2
|
188
|
65
|
8.5
|
0.3
|
Cast film, Pipe, Bottles
|
|
EV2951 F or V
|
29
|
1.2
|
188
|
65
|
3
|
0.3
|
Cast Film, Blown Film, Pipe, Bottles
|
|
EV2951FR
|
29
|
1.17
|
188
|
62
|
1.8-4.2
|
0.5
|
Retort Grade, Film, Bottles
|
|
EV3251 F or V
|
32
|
1.19
|
183
|
62
|
1.6
|
0.4
|
Cast film, Blown film, Sheet, Blow molding, Tube
|
|
EV3251FT
|
32
|
1.17
|
183
|
57
|
4.3
|
0.5
|
Sheet & Thermoforming
|
|
EV3851 F or V
|
38
|
1.17
|
173
|
58
|
1.6
|
0.7
|
Cast film,Blown film, Sheet, Blow molding
|
|
EV4405 F or V
|
44
|
1.14
|
165
|
55
|
1.14
|
1.5
|
Sheet, Film, Tubes
|
|
EV4451 F or V
|
44
|
1.14
|
167
|
56
|
2
|
1.35
|
Film, Molding, Thermoforming
|
