Feature: | Photodegradable |
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CAS No.: | 25067-34-9 |
Formula: | (C2h4o-C2h4)X |
Usage: | General Plastics, Specialty Plastics |
Plastic Properties After Heated: | Thermoplastic Plastics |
Plastic Forming Method: | Extrusion |
Samples: |
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Ethylene vinyl alcohol (EVOH) is a copolymer of ethylene and vinyl alcohol. Because the latter monomer mainly exists as its tautomerthe copolymer is prepared by polymerization of ethylene and to give the (EVA) copolymer followed by hydrolysis. EVOH copolymer is defined by the mole % ethylene content: lower ethylene content grades have higher barrier properties; higher ethylene content grades have lower temperatures for extrusion.
The plastic resin is commonly used as an oxygen barrier in food packaging. It is better than other plastics at keeping air out and flavors in, is highly transparent, weather resistant, oil and solvent resistant, flexible, moldable, recyclable, and printable. Its drawback is that it is difficult to make and therefore more expensive than other food packaging. Instead of making an entire package out of EVOH, manufacturers keep costs down by coextruding or laminating it as a thin layer between cardboard, foil, or other plastics.
It is also used as a hydrocarbon barrier in plastic fuel tanks and pipes.
Application:
Typical Properties | Unit | Test Method | Metric |
MFR | g/10min | ISO1133 (190°C) | 1.8 |
Density | 10³ kg/m³ | ISO1183-3 | 1.19 |
Thermal Properties | Unit | Test Method | Metric |
Melting Temperature | °C (°F) | ISO11357 | 183 |
Crystalization Temperature | °C (°F) | ISO11357 | 162 |
Glass Transition Point | °C (°F) | ISO11357 | 61 |
Vicat Softening Point | °C (°F) | ISO306 | 110 |
Mechanical Properties | Unit | Test Method | Metric |
Tensile stress at break | MPa | ISO527 | 45 |
Elongation at break | % | ISO527 | 12 |
Young's Modulus | GPa | ISO527 | 3.4 |
Flexural Modulus | GPa | ISO178 | 4.4 |
Charpy impact Strength | kJ/m² | ISO179-1 | 2.7 |
Rockwell hardness | HRM | ISO2039-2 | 83 |
Barrier Properties(cast film) | Unit | Test Method | |
Oxygen Transmission rate | cm³.30µm/m².d (20°C,0%RH) |
ISO 14663-2 AnnexC | 0.14 |
Typical Properties | Unit | Test Method | Metric |
MFR | g/10min | ISO1133 (190°C) | 1.8 |
Density | 10³ kg/m³ | ISO1183-3 | 1.16 |
Thermal Properties | Unit | Test Method | Metric |
Melting Temperature | °C (°F) | ISO11357 | 173 |
Crystalization Temperature | °C (°F) | ISO11357 | 152 |
Glass Transition Point | °C (°F) | ISO11357 | 57 |
Vicat Softening Point | °C (°F) | ISO306 | 103 |
Mechanical Properties | Unit | Test Method | Metric |
Tensile stress at break | MPa | ISO527 | 32 |
Elongation at break | % | ISO527 | 17 |
Young's Modulus | GPa | ISO527 | 3.1 |
Flexural Modulus | GPa | ISO178 | 3.6 |
Charpy impact Strength | kJ/m² | ISO179-1 | 2.1 |
Rockwell hardness | HRM | ISO2039-2 | 89 |
Barrier Properties(cast film) | Unit | Test Method | |
Oxygen Transmission rate | cm³.30µm/m².d (20°C,0%RH) |
ISO 14663-2 AnnexC | 0.64 |
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