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Combining the processability of vinyl polymer with the blocking effect of vinyl alcohol polymer, the ethylene-vinyl alcohol copolymer not only shows excellent processing performance, but also shows excellent blocking effect on gas, odor, fragrance, solvent and so on.
Due to its thermal stability in combination with ethylene, multilayer containers containing EVOH barrier layers are fully reusable.
EVOH(Ethylene vinyl alcohol copolymer) Ethylene vinyl alcohol copolymer
EVOH has been the most widely used high barrier material. The film types of this material in addition to non-tensile type, there are biaxial tensile type, aluminum evaporation type, adhesive coating type, etc., biaxial tensile type and heat resistant type for aseptic packaging products.
The barrier property of EVOH depends on the content of ethylene, in general, when the content of ethylene increases, the gas barrier decreases, but it is easy to process.
EVOH is characterized by excellent gas barrier and excellent processability, in addition to excellent transparency, gloss, mechanical strength, scalability, wear resistance, cold resistance and surface strength.
In the field of packaging, EVOH is made into a composite film intermediate barrier layer, which is used in all hard and flexible packaging; Used in the food industry for aseptic packaging, hot POTS and cooking bags, packaging dairy products, meat, canned fruit juices and condiments; In the non-food aspect, it is used for packaging solvents, chemicals, air conditioning structural parts, gasoline drum lining, electronic components, etc.
In terms of food packaging, EVOH plastic containers can completely replace glass and metal containers, and many domestic aquatic companies use PE/EVOH/PA/EVOH/PE five-layer co-extruded film vacuum packaging for exporting seafood. At the same time of accelerating the research of EVOH composite film, the EVOH tensile orientation is also studied abroad. The gas barrier performance of the new EVOH film is 3 times that of the existing high-performance non-stretched EVOH film. In addition, EVOH can also be used as a barrier material coated on other synthetic resin packaging materials to enhance the barrier performance.
EVOH products can not only be used in the production of film, but also can be widely used in cosmetic flexible packaging, floor heating pipes, jelly cups and pesticide bottles, etc. EVOH as a non-toxic environmental protection material, not only can improve people's quality of life, but also plays an important role in environmental protection.
| EVASIN EV2951F DATA SHEET | ||||
| 29 mole%Ethylene Vinyl Alcohol Copolymer | ||||
| Application | ||||
| EV2951F with lower melt flow index is specially designed for co-extrusion cast or blown application.This resin can also be used in bottle and pipe application. | ||||
| General Property | ||||
| Item | unit | Test Method | Value | |
| Mechanical Properties | ||||
| Tensile strength at yield | MPa | ISO 527 | 85.8 | |
| Tensile strength at break | MPa | ISO 527 | 35.7 | |
| Elongation at break | % | ISO 527 | 19.6 | |
| Young's modulus | MPa | ISO 527 | 4,580 | |
| Flexural modulus | MPa | ISO 178 | 4,300 | |
| Flexural strength | MPa | ISO 178 | 130 | |
| Charpy impact strength | KJ/m² | ISO 179-1 | 2.27 | |
| Rockwell hardness | M | ISO 2039-2 | ||
| Density | g/cm² | ISO 1183 | 1.19 | |
| Thermal Properties and Melt Characteristics | ||||
| Melting point | ºC | ISO 11357 | 188 | |
| Crystalization point | ºC | ISO 11357 | 163 | |
| Glass transition point | ºC | ISO 11357 | 62 | |
| icat Softening Poin | ºC | ISO 306 | 175.3 | |
| Melt flow index | g/10min(2160g,190ºC) | ISO 1133 | ||
| g/10min(2160g,210ºC) | ISO1133 | 2.5 | ||
| Gas Barrier Properties | ||||
| O2Transmission Rate at 20ºC 0%RH at 20ºC 65%RH at 20ºC 85%RH | cm³.20μm/m².24Hrs.atm | ISO 14663-2 | 0.1 0.2 1.3 | |
| Water Vapor Transmission Rate | cm³.30μm/m².24Hrs.atm at 40ºC90%RH | ASTME96-E | 55 | |
Ethylene-vinyl alcohol copolymer (EVOH)
Combining the processability of ethylene polymer with the barrier effect of ethylene alcohol polymer, ethylene-vinyl alcohol copolymer not only shows excellent processing performance, but also shows excellent blocking effect on gas, odor, fragrance,solvent, etc.Due to its thermal stability in combination with ethylene, multilayer containers containing EVOH barrier layers are completely reusable.It is these features that enable plastic containers containing EVOH barrier layers to replace many glass and metal containers in food packaging.
