Product Introduction
3M™ Scotch-Weld™ Epoxy Adhesive EC-3448 is a one-part epoxy adhesive formulated to cure at 250°F (121°C) for 60 minutes, forming a tough, rigid bond. This thixotropic adhesive meets aerospace bonding specifications for metal-to-metal bonding and pre-cured fiber-reinforced epoxy composite laminates. It is a paste version of the 3M™ Scotch-Weld™ Structural Adhesive Film AF 163-2 Film, offering excellent durability and reliable bonding in demanding applications.
Designed as a low-flow compound, this adhesive is ideal for vertical and overhead surfaces without run-off. Its soft-paste viscosity allows easy tooling and forming for various applications, and its easy-to-dispense, one-part formula simplifies the application process. 3M™ Scotch-Weld™ Epoxy Adhesive EC-3448 provides excellent performance across a temperature range of -67°F (-55°C) to 225°F (107°C) with unusually high 180°F hot/wet durability. It meets multiple aerospace customer specifications for use in aircraft manufacturing and MRO (maintenance, repair, and overhaul) applications, offering outstanding environmental resistance for long-lasting bonds.
Its thick paste consistency makes it easy to spread over large areas, providing sufficient time for precise positioning of parts. The non-sagging formulation holds its shape upon application, minimizing the need for rework in overhead and vertical applications. The thixotropic nature of the adhesive enhances bond line control, promoting high-quality workmanship and reducing waste and excess weight. Additionally, its high impact resistance improves service life and reduces potential damage over time.
3M™ Scotch-Weld™ Epoxy Adhesive EC-3448 Features
- Designed to bond pre-cured graphite epoxy composites
- Performs excellently from -67°F (-55°C) to 225°F (107°C)
- Unusually high 180°F hot/wet durability for challenging environments
- Non-sagging, thixotropic formula for precise bond line control with minimal rework
- Paste version of 3M™ Scotch-Weld™ Structural Adhesive Film AF 163-2 Film
- Cures at 250°F (121°C) in 60 minutes for rigid, tough bonds
- Ideal for vertical and overhead applications without run-off
- Easy-to-dispense, soft-paste consistency for convenient application
- Qualified for multiple aerospace customer specifications
- High impact resistance and outstanding environmental durability
3M™ Scotch-Weld™ Epoxy Adhesive EC-3448 Applications
- Bonding pre-cured fiber-reinforced epoxy composite laminates
- Metal-to-metal bonding in aerospace manufacturing and repair
- Vertical and overhead bonding applications requiring precise bond line control
- Aircraft assembly and MRO applications meeting rigorous specifications
- Large-area bonding where extended positioning time is needed
- Applications requiring high temperature and moisture resistance
What Are Epoxy Adhesives?
3M™ epoxy adhesives belong to the family of structural adhesives, which also includes polyurethane and acrylic adhesives. These adhesives are formulated with reactive components that chemically cure to form solid plastic materials. 3M offers epoxy adhesives in various formats to accommodate different processing needs:
- Two-Part: Base and Accelerator are stored separately, allowing long shelf life at room temperature. These adhesives are available in duo-pak cartridges for use with the 3M™ EPX™ Applicator System, or in bulk for large-scale operations. Since mixing occurs at the point of use, non-mixed material can be saved for later, reducing waste.
- One-Part: Pre-mixed and shipped frozen. Users store the adhesive in a freezer, then thaw it before use.
- Adhesive Films: Pre-mixed and processed into film form, which can be cut to size and placed directly into bond lines. These films are stored frozen and offer easy, clean application.
In two-part epoxy adhesives, once mixed in the specified ratio, curing begins and offers a limited working time for application and positioning. Similarly, one-part adhesives have a limited “out time” after thawing, during which they must be used. Work life or out time ranges from minutes to over 48 hours, depending on the formulation.
Epoxy adhesives are known for their high shear and peel strengths, superior environmental resistance, and exceptional mechanical and chemical durability. Depending on their formulation, these adhesives can be flexible or rigid, quick or slow setting, transparent or opaque, and suited for room temperature or elevated temperature curing. Their versatility and superior performance make them ideal for applications demanding strong, durable bonds.
About Prostech
Prostech offers specialty materials (adhesives, tapes, thermal interface materials, insulating materials, sealants, PCB protection materials, …) along with manufacturing solutions. We proudly serve a wide range of industries and are an authorized distributor for leading global manufacturers of industrial materials and equipment. Our product range is designed to deliver customized solutions that address each customer’s unique needs.
With years of experience and a successful project history, we are confident in our ability to provide comprehensive material solutions. These solutions effectively tackle the challenges manufacturers face. To explore our full product catalog, simply click here. Our dedicated team is ready to assist with:
- Provide quotation, sample, TDS/MSDS, and technical consultation
- Testing sample quality and verifying product compatibility in our laboratory
- Customizing material formulas for special applications
- Adapting product sizes, quantities, and packaging to meet specific needs
- Offering expert advice on suitable equipment and automation processes
- Delivering technical training and on-site support for optimal product use
Moreover, Prostech ensures the safe and accurate global delivery of all materials, including “dangerous goods”, in compliance with legal regulations. For personalized technical support or to receive a quotation, please contact us today.
| Property | Value |
|---|---|
| Application | Composite Bonding, Metal Bonding, Metal to Composite Bonding |
| Brands | Scotch-Weld™ |
| Container Size (Imperial) | 6 Ounce |
| Container Size (Metric) | 170.1 g |
| Product Color | Light Tan |
