Kuraray EVAL F101B

In today’s hyper-competitive food industry, packaging is no longer just a container—it is a critical element of product preservation. With consumers demanding fewer artificial preservatives and longer shelf lives, food brands face a massive technical challenge: keeping oxygen out without adding unnecessary weight or bulk. Enter EVOH (Ethylene-Vinyl Alcohol Copolymer). This high-performance thermoplastic has rapidly become the gold standard for high-barrier food packaging, shielding sensitive products from spoilage, flavor loss, and degradation throughout the global supply chain.   1.What Exactly is EVOH? At its core, EVOH is a random copolymer of ethylene and vinyl alcohol. To understand why it works so well, we have to look closely at its molecular architecture: The Vinyl Alcohol Units: These segments feature highly polar hydroxyl (-OH) groups. They create an incredibly dense intermolecular hydrogen bond network that acts as a tight molecular mesh. This structure makes it almost impossible for small gas molecules like oxygen (O2), carbon dioxide (CO2), and nitrogen (N2), as well as volatile organic compounds (VOCs) and aromas, to pass through. The Ethylene Units: While vinyl alcohol provides the barrier, it is inherently water-soluble and notoriously difficult to process. Adding ethylene units introduces excellent water resistance, mechanical flexibility, and thermoplastic processability, allowing the polymer to be extruded and thermoformed efficiently.   2. Decoding EVOH Grades: The Mol% Factor Not all EVOH is created equal. The material's performance is strictly governed by its Ethylene Content (expressed in Mol% or mole percent). When choosing an EVOH model for your packaging lines, selecting the right grade is critical to balancing barrier performance with processing requirements. EVOH Ethylene Content Key Characteristics & Performance Best Applications Low Ethylene (27 – 29 mol%)  Extreme gas barrier efficiency due to high monoclinic crystallinity. Highly sensitive to humidity. Ultra-long shelf-life products, dry goods, and specialized industrial chemical packaging. Standard Grade (32-35 mol%)  (Kuraray EVAL F101B) The industry "sweet spot." Delivers an excellent balance of gas barrier property, thermal stability, and ease of extrusion. Chilled meats, dairy products, processed foods, and multi-layer squeeze bottles. High Ethylene (38 – 48 mol%) (EVAL H171B) Excellent stretchability, lower melting point, and superior resistance to moisture, though the gas barrier drops slightly. Deep-draw thermoforming, skin packaging, and high-stretch flexible films.   3. The Multilayer Powerhouse: Integrating Other Polymers Because EVOH is inherently hydrophilic (it absorbs water, which can temporarily weaken its gas barrier), it is rarely used as a standalone film. Instead, it is engineered into high-tech, multi-layer co-extruded structures—often totaling 5, 7, or 9 layers—where a microscopic layer of EVOH (frequently under 10 microns) is shielded by other performance polymers. A typical high-barrier co-extrusion stack includes: Structural Outer/Inner Layers (PP or PE): Polypropylene (PP) or Polyethylene (PE) layers provide moisture protection, structural integrity, and excellent heat-sealing capabilities. PP is ideal for high-temperature retort applications, while PE delivers superior flexibility for frozen foods. The Invisible Bond (Tie Resins): Because EVOH is highly polar and polyolefins like PP/PE are non-polar, they naturally repel each other. To prevent delamination, chemical manufacturers utilize Tie Layer Resins—typically Maleic Anhydride Modified Polyolefins (such as Admer or Bynel). These act as a molecular bridge, permanently anchoring the EVOH core to the structural layers. The Eco-Friendly Alternative to PVDC: Historically, PVDC (Polyvinylidene Chloride) was a dominant barrier material. However, because PVDC contains chlorine, it releases hazardous dioxins during incineration and complicates recycling. EVOH contains only carbon, hydrogen, and oxygen, making it a much safer, chlorine-free alternative for modern sustainable brands.   4. PP vs. EVOH: Understanding the Synergy A common question in packaging procurement is whether to use PP or EVOH. The reality is that they are partners rather than competitors. Feature Polypropylene (PP) EVOH Copolymer Primary Role Structural integrity, moisture barrier, heat-sealing. Gas barrier (Oxygen, Aromas, VOCs). Oxygen Barrier Relatively low. Exceptionally high (keeps $O_2$ out). Moisture Barrier High (protects against water vapor). Sensitive to moisture if unprotected. Chemical Resistance Excellent against acids, fats, and oils. High resistance to organic solvents and mineral oils. Cost Profile Economical commodity polymer. Premium specialty resin (used sparingly).   By combining them—using PP for the tough outer armor and a sliver of EVOH for the inner oxygen shield—manufacturers achieve a high-performance, cost-effective structure.     5. Economic & Environmental Benefits Deploying EVOH multi-layer technology yields significant bottom-line and environmental advantages: "Less Material, More Function": Because EVOH provides an exceptional barrier at a thickness of only a few microns, it enables radical down-gauging (light-weighting). This reduces raw material consumption and lowers shipping costs. Anti-Static & Pristine Display: EVOH exhibits natural anti-static properties. When integrated near the surface layer, it prevents dust accumulation on retail shelves, ensuring a glossy, crystal-clear, high-transparency package presentation that attracts buyers. A Massive Reduction in Food Waste: By eliminating oxygen permeation, EVOH dramatically delays oxidation, color loss, and spoilage without requiring heavily added artificial preservatives. Choosing the ideal EVOH grade and multi-layer structure depends entirely on your product's specific lifecycle—whether it requires deep-draw thermoforming, high-temperature sterilization, or extended ambient storage. By integrating targeted EVOH copolymers with standard polyolefins, modern packaging systems achieve an ideal balance of durability, cost efficiency, and world-class freshness preservation.   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

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