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SURLYN

Updated: 2026-08-03

Overview

Surlyn is a family of ionomer resins originally developed by DuPont, now produced by Dow Chemical Company. It is a thermoplastic material known for its unique combination of properties, including high impact strength, clarity, and adhesion to various substrates. The material is an ethylene-methacrylic acid copolymer where some acid groups are neutralized with metal ions, giving it distinctive ionomeric characteristics. Surlyn resins are available in several grades tailored for specific applications, ranging from flexible packaging films to rigid golf ball covers. The material's versatility stems from its ability to be processed using conventional thermoplastic techniques such as extrusion, injection molding, and blow molding.

Physical and Chemical Properties

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Surlyn exhibits excellent optical clarity, often comparable to glass, making it suitable for applications requiring transparency. Its impact resistance is particularly notable, with some grades able to withstand significant mechanical stress without cracking or breaking. The material maintains good flexibility at low temperatures and has a relatively low melting point for easy processing. Chemically, Surlyn shows good resistance to oils, greases, and many solvents. However, it can be affected by strong acids and bases. The ionic crosslinks in the polymer structure provide unique properties such as excellent adhesion to metals and other substrates, which is unusual for polyolefin-based materials.

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Main Applications

Surlyn finds extensive use in the packaging industry, particularly for food packaging where its clarity, toughness, and heat-sealing properties are valued. It's commonly used as a sealing layer in multilayer films and as a protective coating for pharmaceutical packaging. In sports equipment, Surlyn is the material of choice for golf ball covers due to its durability and feel characteristics. Industrial applications include automotive parts, wire and cable coatings, and protective laminates for electronic components. The material's adhesion properties make it useful for bonding layers in composite materials. Recent developments have expanded Surlyn's use in renewable energy applications, particularly in photovoltaic module encapsulation.

Safety and Storage

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Surlyn is generally considered safe for handling under normal conditions. As with most thermoplastic materials, adequate ventilation should be maintained during processing to avoid inhalation of decomposition products. The material is not classified as hazardous under normal handling conditions, but dust generation should be minimized. For storage, Surlyn should be kept in its original packaging in a dry, cool environment away from direct sunlight and heat sources. Typical shelf life is 12-24 months when stored properly. Special grades may have specific storage requirements that should be verified with the supplier.

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B2B Procurement Guide

When procuring Surlyn resin, buyers should clearly specify the required grade based on the intended application, as properties vary significantly between grades. Key parameters to consider include melt index, acid content, neutralization type, and optical properties. Lead times can vary from weeks to months depending on grade availability and order volume. For large-volume purchases, consider negotiating long-term supply agreements to secure stable pricing. Quality certifications such as FDA compliance for food contact applications should be verified. Technical support from the supplier can be valuable for application development and troubleshooting processing issues.

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