EVASIN EV-4405F

In the world of modern packaging and industrial design, finding a material that perfectly balances protection, durability, and processability is a constant challenge. Enter EVOH (Ethylene-Vinyl Alcohol Copolymer), a thermoplastic polymer that has quietly revolutionized how we preserve food, transport chemicals, and engineer high-performance fuel systems. But what exactly makes EVOH so unique, and why is it considered an elite barrier material? Let’s dive into the science, properties, and diverse applications of this remarkable polymer.     1.What is EVOH? EVOH is a thermoplastic copolymer comprised of ethylene and vinyl alcohol. Its molecular structure features a random, irregular distribution of these two components, carefully controlled during manufacturing to ensure optimal performance. The magic of EVOH lies in the interplay between its two monomers: Vinyl Alcohol (PVA properties): Provides exceptionally high gas barrier properties and high stiffness, though it suffers from poor flexibility and processing challenges on its own. Ethylene (PE properties): Delivers excellent processability and flexibility, though it has very low gas barrier capabilities on its own. By combining these two, EVOH achieves an incredible synergy: elite gas insulation coupled with the practical melting and shaping characteristics of traditional plastics.   2. Key Performance Characteristics EVOH stands out because of a highly specialized suite of physical and chemical traits: Unmatched Gas Barrier Properties EVOH provides an unparalleled shield against gases like oxygen, nitrogen, and carbon dioxide. For perspective, when looking at a standard film thickness of roughly 25.4 µm, EVOH maintains an oxygen transmission rate of just 0.4 to 1.5 cm³ / (m²·day), compared to Low-Density Polyethylene (LDPE) which lets through a massive 10,000 to 15,000  cm³ /(m²·day).  Flavor and Aroma Retention Because gases cannot easily pass through EVOH, it locks in the precise aroma and flavors of condiments, spices, and cosmetics, preventing external odors from contaminating the product.  Superior Chemical and Oil Resistance The presence of hydroxyl (-OH) groups creates powerful intermolecular hydrogen bonds, driving the Solubility Parameter (SP) of EVOH up to a high value of 19. Because most common organic solvents, oils, and fuels have much lower SP values, they cannot dissolve or easily penetrate EVOH, making it exceptionally oil-resistant.  Excellent Optical and Mechanical Qualities Products processed with EVOH boast high transparency and a glossy surface finish. Mechanically, it is highly rigid yet maintains excellent flexurability and toughness. Furthermore, its surface does not accumulate static electricity, making it safe for sensitive electronic component packaging.    3.The Ethylene Content Balancing Act When evaluating EVOH grades, the mole% of ethylene is the most critical metric, as it directly dictates the material's final behaviors:  Low Ethylene Content (e.g., 29–32 mol%): Yields the absolute highest gas barrier performance (lowest oxygen transmission) and higher melting points (~183°C to 188°C), but is slightly more rigid to process.  High Ethylene Content (e.g., 38–44 mol%): Drastically improves thermoplastic processability and flexibility. While the oxygen transmission rate increases slightly, it remains profoundly superior to virtually all other standard polymers (such as EVASIN EV-4405F/ Evasin EV3851FS ) .  Additionally, high-quality manufacturing requires strict control over residual acetyl groups. If too many acetyl groups remain on the molecular chain, they act as "blockers" that disrupt intermolecular bonding and degrade the polymer’s barrier integrity.    4.The Catch: Vulnerability to Moisture While EVOH is an absolute powerhouse against gases, it does have one structural Achilles' heel: water vapor.  Because of its hydrophilic hydroxyl (-OH) groups, EVOH exhibits a poor moisture barrier. When exposed to highly humid environments, its internal gas-blocking network softens.  The Solution: Co-Extrusion Architecture To overcome this, engineers never use EVOH entirely alone in moisture-exposed environments. Instead, it is integrated into a multi-layered, co-extruded structural sandwich alongside traditional hydrophobic (water-repelling) plastics like PE, PP, or PET.  Because EVOH’s high polarity (SP 19) makes it incompatible with the low-polarity surfaces of PE or PP, a specialized tie-layer (adhesive) is placed between them to prevent delamination.    5.Real-World Co-Extrusion Applications Thanks to versatile processing methods—including blown film extrusion, sheet co-extrusion, blow molding, and injection molding—EVOH can be tailored into various structures:  Ketchup Bottles: Designed as PP - Tie - EVOH - Tie - PP. The outer PP layers lock out moisture and allow squeeze-ability, while the internal EVOH core stops oxygen from spoiling the condiment.  High-Barrier Multi-layer Packaging Bags: Styled as PET - PE - Tie - EVOH - Tie - PE to provide pristine preservation for delicate or nitrogen-flushed food items like sliced meats.  Wine and Juice Cartons/Bottles: Built utilizing PE - Paper - PE - Tie - EVOH - Tie - PE structures.  Chemical Packaging & Automotive Fuel Tanks: Built with an HDPE - Tie - EVOH - Tie - HDPE matrix. EVOH’s supreme solvent resistance ensures volatile fuel vapors or hazardous chemicals cannot seep through the plastic walls into the environment.  Underfloor Heating Pipes (Radiant Piping): Often laid out as PP - Tie - EVOH to keep oxygen from penetrating the heating lines and causing internal system corrosion.  EVOH bridges the gap between raw structural strength and delicate environmental shielding. While it requires smart multi-layer engineering to stay protected from moisture, its peerless ability to halt gases, trap aromas, and resist harsh solvents makes it a foundational material in modern eco-friendly, long-shelf-life packaging designs.     Website: www.elephchem.com whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com

EVASIN EVOH resin is an ethylene-vinyl alcohol copolymer, used to manufacture films, sheets, and packaging containers with high oxygen barrier properties. The EVASIN series offers various grades of composition and rheological properties suitable for various processing techniques, such as multilayer co-extrusion, casting, blow molding, sheet molding, blow molding, biaxial stretching, injection molding, and extrusion molding. The ethylene content of EVASIN EVOH resin is related to its barrier properties; lower ethylene content results in higher oxygen barrier properties, and higher barrier properties lead to higher resin hardness. EVASIN EVOH (EVOH EW-3201) has excellent gas barrier properties, blocking various odors from seasonings, spices, cosmetics, etc., making it suitable for food packaging. It also exhibits excellent oil resistance and barrier properties against oils and chemical solvents, thus finding applications in automotive fuel tanks, pesticide bottles, and underfloor heating pipes. Characteristics: Excellent gas barrier properties, affected by humidity Good printability Oil resistance Solvent resistance Weather resistance High transparency High rigidity Excellent flexibility Good antistatic properties Moisture retention Good surface gloss   EVASINT EVOH Naming Principles: The letters E and V represent EVOH. The third and fourth digits represent the ethylene content: for example, 32 represents 32% ethylene content; 38 represents 38% ethylene content; 44 represents 44% ethylene content. The fifth and sixth digits are related to fat melting: 01 represents fat melting of 1-2 G/min, 51 represents a new specification with unchanged fat melting (190℃, 2160 G). The letter V represents: no processing aids added. The letter F represents: compounding processing aids added. EVOH has excellent barrier properties against gases such as oxygen, nitrogen, and carbon dioxide, but due to its hydrophilic groups, it has poor barrier properties against water vapor. Therefore, when considering barrier properties against all gases, EVOH is generally used as an intermediate layer in co-extrusion molding with traditional hydrophobic thermoplastics.     EVASIN EV-4405F is mainly used in the following fields: Packaging: Food Packaging: It is used as an intermediate barrier layer in composite films for aseptic packaging, hot cans, and retort pouches, packaging dairy products, meat, canned juice, and condiments. It effectively prevents oxygen and moisture from entering the packaging, extending the shelf life of food and maintaining its flavor and quality. For example, in milk powder packaging, it prevents the milk powder from getting damp and oxidizing, ensuring that the nutritional components of the milk powder are not destroyed. Non-food packaging: Used for packaging solvents, chemicals, air conditioning structural components, gasoline drum liners, electronic components, etc. Due to its excellent barrier properties, it can prevent solvent evaporation, chemical leakage, and protect electronic components from external environmental influences. Automotive industry: Due to its good oil resistance and barrier properties, it can be used as a barrier layer material for automobile fuel tanks, effectively preventing fuel evaporation and leakage, reducing environmental pollution, and improving vehicle safety and fuel efficiency. Other fields: It can be used to produce packaging materials for household goods, underfloor heating pipes, wallpaper, etc. In household goods packaging, it provides good protection and barrier properties; in underfloor heating pipes, it helps improve the pipes' corrosion resistance and oxygen barrier properties, extending the pipes' service life; in wallpaper, it can enhance the wallpaper's performance, such as waterproofing, moisture resistance, and odor blocking.   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

Ethylene-VinylAlcohol Copolymer (EVOH) resin provides a superior barrier against oxygen permeation, exhibiting performance up to four orders of magnitude greater than conventional polyethylene. Due to its excellent barrier properties, formability, and environmental friendliness, it is widely used in high-end new material fields such as automotive fuel tanks, films, food containers, and underfloor heating pipes. When it comes to food packaging, EVOH really helps keep food fresh and flavorful for a long time, sometimes even years, without needing preservatives. EVOH( EW-3201&EVAL F105B)is made bycombining ethylene and vinyl alcohol.     Applications    1.Packaging EVOH is often used with other materials for packaging since it's such a strong barrier: Food & Beverage: It’s used for items like milk, juice, seafood, and other things that spoil quickly. For example, Chinese seafood exporters use five-layer vacuum-sealed films made of PE, EVOH, and PA. Non-Food: You’ll find it in chemicals, cosmetics, pharmaceuticals, and electronics packaging.   2. Automotive Fuel Tanks: EVOH mixed with HDPE makes lightweight and affordable plastic fuel tanks. Structure : Outer layer (HDPE) → Recycled layer → Adhesive layer (LLDPE) → Barrier layer (EVOH) → Adhesive layer (LLDPE) → Inner layer (HDPE). Fuel Lines: PA-EVOH composite tubes replace metal pipes, aiding vehicle lightweighting.       3. Medical Selective Permeable Membranes: Sterilized via radiation (e.g., EVOH hollow fibers for dialysis). Artificial Kidneys: Hollow-fiber membranes for blood purification. Drug Delivery: EVOH-coated polymers for controlled-release medications. Biomedical Implants: Blends with corn starch or cellulose acetate for bone substitutes and tissue repair.   4. Construction Heating Pipes: EVOH’s oxygen barrier prevents corrosion in heating systems. Types: 3-layer (external barrier) and 5-layer (internal barrier) pipes, both using EVOH.   5. Other Uses Textiles: Heat-sealing adhesives with superior wash resistance for apparel. Hydrogen Storage: EVOH-modified hydrogen tank liners maintain elasticity and barrier performance even at low temperatures.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com    

By the end of 2023, China's annual Ethylene-VinylAlcohol Copolyme (EVOH) consumption will be about 30,000 tons, but more than 90% of it is dependent on imports, mainly from international giants such as Japan Kuraray (Kuraray) and Japan Synthesis Chemical (JSR).     Chuanwei Chemical (a subsidiary of SINOPEC) is currently the closest to the industrialized production of EVOH enterprises, has built an annual output of 12,000 tons of EVOH (including EVOH EW-3201 and EVAL C109B) production equipment, and plans to add 24,000 tons of new production capacity in the future, with a total production capacity of 36,000 tons/year, which is expected to be the first enterprise to achieve large-scale production in China. Leveraging alkaline deep eutectic solvents, the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, has pioneered an ethylene vinyl alcohol (EVOH) production method that significantly cuts separation expenses and elevates product purity. This breakthrough offers critical technical underpinnings for domestic EVOH manufacturing.   Concurrently, the Shenzhen Institute of Advanced Polymer Research has achieved a milestone by developing EVOH resins, utilizing continuous polymerization and precise control over polymer chain segments, that match the performance of leading international brands, effectively addressing a critical void in domestic EVOH technology.   Policy support: the national “14th Five-Year Plan” clearly puts forward to strengthen the independent research and development of high-end polymer materials, EVOH as a high-performance barrier material, by the policy encouragement and industrial funding support.   Market prospect: It is expected that after 2025, with the commissioning of domestic enterprises such as Chuanwei Chemical, the annual production capacity of EVOH in China is expected to exceed 50,000 tons, which will significantly reduce the dependence on imports, and some of the products may even be exported to the international market.   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 Acetate Copolymer), is a plastic known for keeping gases out. You’ll often see it in food packaging, medical supplies, and protective gear for cars and electronics. Because it contains a lot of vinyl acetate, it does a great job blocking gases like oxygen and nitrogen, which helps food stay fresh longer.     The reason EVOH is so effective at this is because of its tightly packed structure, which makes it harder for gas molecules to sneak through.  Manufacturers can tweak the hydrolysis level during production, and when they increase it, the molecular chains become tighter, improving its gas-blocking abilities. In China, EVOH products (EW-3201 and EW-3801) produced by Sinopec are highly recognized.     EVOH also stands out from other plastics because it’s resistant to chemicals and high temperatures, plus it’s clear.  It's easy to work with, too, so it can be used in multilayer packaging without complicated processes, making it both practical and afford.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com