Ethylene-VinylAlcohol Copolymer

A Decision Guide Based on Performance Parameters: In the field of high-performance barrier packaging, Ethylene-Vinyl Alcohol Copolymer (EVOH) is a core material in multi-layer co-extrusion processes due to its excellent gas barrier properties. The EVASIN series, a leading EVOH brand in the market, offers various grades with ethylene content ranging from 29% to 44%. For packaging manufacturers, choosing the right grade is not only crucial for the shelf life of the final product but also directly impacts processing stability and overall costs.   1. The Deep Connection Between Ethylene Content and Gas Barrier Performance Ethylene content is the most fundamental indicator determining the physical properties of EVOH. EVASIN grades are usually named according to their ethylene content. Changes in ethylene content directly alter the crystallinity of the polymer, which in turn affects its oxygen permeability. ♣ Low Ethylene Content (EVASIN EV-2951F, 29% mol): When the ethylene content is low, the hydrogen bonding between molecules is stronger, resulting in higher crystallinity. This gives it extremely high barrier properties in a dry state. The oxygen transmission rate of Evasin EV- 2951F is only 0.2 cm³·20µm / m²·24hrs·atm. For meat, high-end refrigerated foods, or chemicals that are extremely sensitive to oxygen and require a very long shelf life, the 29% content grade is the preferred choice. However, it should be noted that low-ethylene-content EVOH has a higher melting point (188℃), a narrower processing temperature range, and is relatively more sensitive to humidity.     ♣ High Ethylene Content (Evasin EV-4451F, 44% mol): As the ethylene content increases, the barrier performance decreases. The oxygen transmission rate of Evasin EV-4451F is 1.8, which is 9 times that of Evasin EV-2951F. However, high ethylene content provides better flexibility, a wider processing window, and superior humidity resistance. In storage environments with high humidity (above 65% RH), the barrier performance of high-ethylene-content grades decreases less significantly. ♣ Selection Logic: If your product needs to be stored at room temperature for more than 12 months, you should prioritize models with a 29% - 32% content; if your production line requires high processing flexibility, or the product requires moderate barrier properties (such as films for daily chemical products), then models with 38% - 44% content offer better cost-effectiveness and ease of processing.   2. Melt Index and Mechanical Compatibility with Processing Technology When selecting a model, in addition to the final performance, the compatibility of the material with existing extrusion equipment and compounding processes must also be considered. The melt index is a core parameter for measuring resin fluidity, directly determining the extrusion pressure, shear heat, and film uniformity.     ♣ Applications of Low Melt Index Models (MI 1.7 - 1.9): Evasin EV3251F (MI 1.7) and Evasin EV3851VS(Evasin EV3851FS) (MI 1.8) are typical low melt index specifications. These materials have high viscosity and melt strength in the molten state, making them ideal for blown film processes. In the blown film process, high melt strength ensures the stability of the film bubble, preventing rupture or uneven thickness under high-speed traction. In addition, low melt index materials also help to form a more stable melt curtain in the cast film process. ♣  High Melt Index and Special Process Models (MI 4.01 - 4.3): Under 210℃ testing conditions, the MI of EV 3251F reaches 4.01, while EV 3251FT reaches 4.3. The higher fluidity makes it more suitable for high-shear cast film processes or co-extrusion. For complex multi-layer structures (such as 7-layer or 9-layer films), high-fluidity EVOH can better match the adjacent adhesive layers and support layers (such as PE or PP), reducing dead spots and crystal formation in the flow channel. ♣ Consideration of Melting Point: The melting point difference between different models can be as high as 23℃ (165℃ vs 188℃). When selecting a model, you must confirm the heating system and die temperature control accuracy of your extruder. If choosing EV 2951F, the processing temperature usually needs to be set between 210℃ and 230℃.  Improper temperature control can easily lead to material degradation and carbonization.   3. Targeted Model Recommendations for End-Use Packaging Scenarios ♣ Meat and Dairy Vacuum Packaging: This application requires extremely high oxygen barrier properties, typically using a PA/EVOH/PE structure. EV 2951F is the benchmark in this field, maximizing the inhibition of aerobic bacteria growth. If deep drawing is involved, EV 3251FT is recommended. The "T" designation usually indicates optimization for thermoforming processes, providing better uniform stretching distribution and preventing thinning and embrittlement of the barrier layer at the container corners. ♣ MAP and Lidding Films: For MAP packaging of fresh fruits and vegetables, a certain gas exchange balance is required. EV 3851F/V provides moderate barrier properties, preventing large amounts of external oxygen from entering while also assisting in gas regulation within the overall structure. ♣ Pesticide and Chemical Anti-Permeation Bottles: In these applications, the focus is on blocking organic solvents and odors. Evasin EV4451F is often used in blow molding to produce multi-layer plastic bottles due to its good chemical resistance and processing stability. Although its oxygen barrier properties are slightly inferior, it performs excellently in blocking hydrocarbon permeation, and its stability under high humidity ensures the safety of chemical products in warehouse storage environments. ♣ Pipes and Underfloor Heating Systems: In non-packaging applications, such as the oxygen barrier layer in underfloor heating pipes, long-term heat stability and flexibility are usually required. EV 4451V, with its lower melting point and higher ethylene content, exhibits excellent compatibility in simultaneous processing with polyolefin pipes.   ♠ During B2B procurement and production preparation, it is recommended to follow the following process for initial model selection: Clarify barrier requirements: Based on O2 sensitivity. Choose 29% for extremely high barrier, 32%-38% for general barrier, and 44% for high moisture resistance/flexibility requirements. Matching processing technology: For blown film extrusion, prioritize low MI grades (1.7-1.9); for cast film or complex co-extrusion, select high MI grades (4.0 or higher). Confirm equipment temperature control: Ensure the extruder can stably provide the required melting temperature for the specific grade (especially for grades with 29% content).   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com

In the vast plastics industry, the choice of polymer is crucial in determining the performance and cost of the final product. This discussion will compare two kinds of polypropylene, Braskem Polypropylene RP 225M and ADMER QB520E, which are suited for different jobs. RP 225M, a medium-flow random copolymer, sees use in film applications because of its good optical clarity and slip. QB520E, on the other hand, is a unique maleic anhydride-grafted homopolymer PP-based adhesive resin focused on adhesive applications in multilayer structures. If you're looking for the right material for flexible packaging, textile applications, or composite structures, this comparison guide will provide clear insights to help you make an informed choice.   1. Core Performance Comparison: RP 225M vs QB520E 1.1 Flowability and Density Features Braskem RP 225M ADMER QB520E Emphasis/Differences Mel Flow Rate (MFR) 8.0 g/10 min 1.8g/10min RP 225M has higher flowability, suitable for thin-walled or high-speed extrusion processes (such as films); QB520E has lower flowability, which is beneficial for improving melt strength and adhesion. Density 0.902g/cm3 0.90g/cm3 Both have very similar densities, falling within the typical polypropylene density range. 1.2 Mechanical Strength and Rigidity Features Braskem RP 225M ADMER QB520E Emphasis/Differences Tensile Yield Strength 28 MPa 24 MPa RP 225M has a slight edge in tensile strength, which may provide better load-bearing capacity in single-layer flexible packaging. Flexural Modulus 900 MPa N/A / Cantilever Impact Strength 30 J/m 470 J/m2 QB520E exhibits extremely high impact strength, consistent with its application as an adhesive layer in bottles, sheets, etc., where high toughness is required to withstand impacts. Elongation at Break 12%(Yield) 280% (Fracture) QB520E's elongation at break is significantly higher than RP 225M's yield elongation, confirming its high toughness and flexibility, ideal properties for an adhesive resin.   2. In-Depth Application Analysis: Identifying Your Needs 2.1 Braskem RP 225M: Transparency, Sliding, and Heat Sealing RP 225M is a product tailored for single-layer flexible packaging and textile applications. Key Features: Excellent Optical Properties: As a random copolymer, it inherently possesses better transparency and gloss than homopolymers, meeting the demands of high-definition packaging. Excellent Sliding Properties (Low Coefficient of Friction): Contains sliding agents and anti-blocking agents to ensure smooth operation on high-speed packaging machinery, preventing film sticking. Good Heat Sealing Properties: The lower initial heat-sealing temperature (111°C) helps improve packaging efficiency. Suitable Applications: Various flexible packaging films (flat extruded and blown films) 1717, especially for inner or middle packaging requiring high transparency and ease of handling, as well as textile applications. 2.2 ADMER QB520E: The "Glue" for Multilayer Structures QB520E is essentially an adhesive resin designed to solve the problem of direct bonding between different polymer layers. Key Characteristics: Strong Bonding: Utilizing maleic anhydride grafting technology, it can form strong chemical bonds with polar materials (such as EVOH or PA (polyamide)) and non-polar PP substrates, creating a high-barrier, high-strength multilayer structure. High Toughness: Extremely high impact strength (470 J/m²) and elongation at break ensure that the composite material will not delaminate under impact or bending. Processing Stability: Maximum processing temperature up to 300°C provides safety for multilayer co-extrusion. Applications: Primarily used in co-extrusion processes as an adhesive between PP and EVOH/PA barrier layers. Typical products include: Multilayer Barrier Bottles and Sheets: Used for packaging with high barrier requirements, such as for food and cosmetics. Multilayer Blown Films and Pipes: Ensures the integrity and durability of pipe and high-barrier film structures.   3. Production and Safety Considerations 3.1 Processing Recommendations RP 225M: Use planar film extrusion or blown film extrusion processes. High MFR is beneficial for processing. QB520E: Although it has low flowability, it does not require pre-drying, simplifying preparation for multilayer co-extrusion processes. Its melt viscosity-shear rate profile (rheological profile) helps to precisely control layer thickness in co-extrusion. Attention should be paid to the maximum temperature limit (300°C) to avoid decomposition. 3.2 Safety and Regulations RP 225M: Not recommended for packaging or products that come into contact with parenteral solutions or the human body. QB520E: Regarding food contact conditions, its components have relevant compliance statements in the EU and US FDA (as an adhesive), but the manufacturer is responsible for ensuring that the final application complies with all food contact regulations.   4. Summary and Recommendations Your final choice depends on your product structure: If you need to manufacture a single-layer packaging film with good clarity, rigidity, and slip resistance, RP 225M is ideal. If you need to manufacture a multi-layered structure (such as plastic wrap or barrier bottles) that includes a barrier layer (such as Ethylene-VinylAlcohol Copolymer (EVOH) /PA), QB520E is a key material to ensure strong adhesion and high toughness between different layers.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com

In modern industry, especially in the food, medical, and cosmetic packaging sectors, the requirements for material performance are becoming increasingly stringent. High-barrier materials are crucial for ensuring product quality, extending shelf life, and reducing waste. Ethylene-VinylAlcohol Copolymer is seen as a great green packaging material because it blocks gases, smells, and solvents so well. It also possesses good processability, transparency, mechanical strength, abrasion resistance, and cold resistance.     EVOH is a type of thermoplastic resin made from ethylene and vinyl alcohol. A key feature is the many hydroxyl groups (-OH) in its structure. These groups create strong hydrogen bonds, which limit how well gas molecules, like oxygen, can pass through it. This gives EVOH very good barrier properties. It blocks oxygen much better than common polymers like polyethylene (PE) or polypropylene (PP). In fact, EVOH can be thousands of times better at blocking oxygen.   1.  EVOH EW-3201: Specifications Overview Items Specifications Appearance White transparent particle Melting index (190℃,2160g/10min) 1.5-2.5 Chroma ≤20 Volatile content(%) ≤0.3 Ethylene(mol%) 30.0-34.0 Density (g/cm3) 1.10-1.20   2. In-depth Analysis of Key Physical Properties 2.1 Superior Gas Barrier Performance The core advantage of EW-3201 lies in its ethylene content, ranging from 30.0 to 34.0 mol%. For EVOH (Extracorporeal Membrane Oxide), ethylene content is a crucial parameter: Lower ethylene content: More hydroxyl groups (-OH) on the polymer chain, stronger hydrogen bond network, and better oxygen barrier performance. Higher ethylene content: Better polymer thermal processability (melt index, flexibility), and improved water resistance, but slightly reduced barrier performance. EW-3201's 30.0-34.0 mol% ethylene content provides a good thermal processing window while ensuring extremely high oxygen barrier performance. This method is appropriate for packing food items needing strict preservation (like meats, sauces, and milk products) and medical tools needing high levels of cleanliness, which extends how long they can be stored. 2.2 Ideal Processing Performance The melt index (MI) of EW-3201 is 1.5-2.5 g/10 min, which is a relatively moderate range. Moderate MI: This indicates that its melt viscosity is moderate and its flowability is good, making it suitable for high-speed, complex co-extrusion or lamination processes without excessive degradation during processing. Importance in Co-extrusion: EVOH is typically used in thin layers sandwiched between structural layers such as PE, PP, or PET. The MI value helps EW-3201 match well with typical adhesives and outer layers. This makes for good mixing of multilayer structures and strong sticking between layers. 2.3 High Density and High Transparency EVOH typically has a high density (1.10-1.20 g/cm³), attributed to its highly ordered molecular structure and strong hydrogen bonds. High density is the structural basis for achieving high gas barrier properties. Meanwhile, a colorimetric index below 20 ensures that films or containers made from EW-3201 possess excellent transparency and gloss, crucial performance for packaging that needs to display contents (such as high-end food and cosmetics). 2.4. Environmental Sensitivity  It's important to note that the barrier properties of EVOH are sensitive to environmental humidity. Because the hydroxyl groups on the molecular chain are hydrophilic, when environmental humidity (RH) increases, water molecules enter the hydrogen bond network, weakening hydrogen bonding and leading to increased oxygen permeability.  Application Solution: EW-3201 is commonly paired with thermoplastics like PE, PP, and PET in real-world uses. This is done through co-extrusion or lamination to create a multilayer structure. The EVOH layer is placed between polyolefin layers that have good moisture resistance. This effectively protects the EVOH layer from moisture, allowing it to maintain excellent barrier performance even in high-humidity environments.   3. Main Applications Food Packaging: Used in the production of oxygen barrier films, cling film, aseptic packaging, tubing, and bag-in-bag systems, significantly extending the shelf life of dairy products, jams, meat, seafood, coffee, and tea. Medical Supplies: Used for aseptic packaging of infusion bags and medical devices, preventing product oxidation and microbial contamination. Industry and Agriculture: Used as an oxygen barrier layer for underfloor heating pipes to prevent pipe corrosion; or for solvent-resistant containers for solvents and chemicals. Cosmetic Packaging: Used in the production of multi-layer cosmetic tubing and containers, effectively preventing the oxidation or volatilization of fragrances, vitamins, and other active ingredients.   As the packaging industry needs thinner, more efficient, and greener materials, good ethylene vinyl alcohol (EVOH) products such as EW-3201 (EVASIN EV-4405F) will keep being very important and will push forward barrier packaging tech improvements around the world. Choosing EW-3201 means choosing a high-performance, highly reliable, and sustainable packaging future.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com

EVOH (Ethylene Vinyl Alcohol Copolymer) is considered to be a more environmentally friendly material, mainly in terms of its advantages in reducing food waste, prolonging product freshness, and in the recycling process.EVOH's gas barrier properties are excellent, and it can effectively prevent oxygen, water vapor, and other substances from entering into the package, thus prolonging the shelf-life of the food, and reducing food spoilage and waste. This feature makes EVOH particularly important in food packaging, and can significantly reduce the environmental burden caused by food expiration or spoilage.     In addition, EVOH has good recyclability, and although its recyclability is not as good as that of materials such as PE (polyethylene) and PP (polypropylene), it can be used in combination with these materials to take advantage of the strengths of both materials; PE and PP have better mechanical strength and chemical resistance, while EVOH provides a better barrier to gases. Through composite use, this multi-layer packaging material ensures packaging functionality while allowing for easier disposal during recycling, helping to reduce resource waste.   What's more, EVOH is produced in a relatively environmentally friendly manner and does not release harmful substances during its use. Compared to other traditional plastic materials, the use of EVOH reduces the need for chemical additives, further minimizing the impact on the environment. Therefore, EVOH (EVOH EW-3801 & EVAL F101A) is playing an increasingly important role in promoting green packaging and circular economy, becoming an environmentally friendly and sustainable packaging material.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com    

EVOH (ethylene-vinyl alcohol copolymer) is a polymer material produced by copolymerization of ethylene and vinyl alcohol. Since the polar hydroxyl groups on the EVOH molecular chain can form hydrogen bonds with water molecules, it can block moisture, while its non-polar vinyl groups can effectively block gases.   EVOH(EVOH EW-3201) has good processing properties and can be blended or compounded with various plastics such as PE, PP, PET, etc. to produce blended or composite materials with excellent performance. It also has good thermal stability and can be processed at high temperatures. It has excellent transparency, which makes the contents of the package clearly visible and easy for consumers to check. It can be completely recycled and reused, and can also be biodegraded to reduce pollution to the environment. Due to its excellent barrier properties and environmental protection, EVOH is widely used in the field of food packaging. For example, it is widely used in vacuum packaging, food cans, beverage bottles and other fields.   EVOH is also widely used in the field of medical packaging, such as pharmaceutical packaging, medical dressing packaging, etc. Its excellent barrier properties can effectively extend the shelf life of drugs and medical dressings. In addition, EV0H is also widely used in the fields of cosmetic packaging, pesticide packaging, etc.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com ElephChem Holding Limited, professional market expert in Polyvinyl Alcohol(PVA) and Vinyl Acetate–ethylene Copolymer Emulsion(VAE) with strong recognition and excellent plant facilities of international standards.