Modern Film Adhesive Technology: AF-163-2 Competitors

Reengineering a Legacy Standard for Today’s Manufacturing

For decades, film adhesives like 3M Scotch-Weld AF-163-2 Adhesive Film have been a cornerstone of aerospace and composite bonding. Designed as a thermosetting epoxy film adhesive, AF-163-2 became widely adopted due to its high fracture toughness, peel strength, and versatility across laminate and honeycomb structures.

However, evolving regulatory requirements, environmental concerns, and supply chain challenges have driven the need for modern alternatives. MAKO Advanced Materials has addressed this gap with AF-1000, a next-generation film adhesive engineered as a high-performance replacement for AF-163-2, while improving workshop safety, sustainability, and manufacturability.

Core Chemistry and Functional Design

Traditional AF-163-2 adhesives are based on modified epoxy thermoset chemistry, optimized for structural bonding across metals and composite substrates. These systems cure into a rigid network that delivers strong adhesion across a wide temperature range, typically maintaining performance from sub-zero conditions up to approximately 250°F.

MAKO’s AF-1000 builds on this foundation and incorporates modernized resin chemistry that eliminates legacy components such as:

• Phenol formaldehyde systems
• PFAS-based additives
• Older hazardous processing materials

The result is a PFAS-free adhesive system with more benign chemistry and improved environmental and OSHA profiles.

From a formulation standpoint, AF-1000 retains the key mechanical properties of legacy film adhesives while improving handling and safety—an important advancement for both aerospace and industrial manufacturing environments.

Cure Behavior and Processing Window

One of the defining characteristics of AF-163-2 is its flexible cure profile, typically centered around a 250°F cure, with usable ranges between approximately 180°F and 300°F.

AF-1000 maintains this versatility, allowing it to integrate into existing production processes without requiring major changes to:

• Autoclave cycles
• Press curing systems
• Vacuum bagging workflows

This compatibility is critical for manufacturers working within qualified processes or legacy tooling setups.

Additionally, MAKO’s formulation offers improvements in:

• Outlife (working time before cure) and shelf life
• Handling characteristics
• Consistency across batch production

In comparison to the original system’s relatively short outlife and shelf life, AF-1000 provides extended usability, reducing material waste and improving workflow flexibility.

Mechanical Performance and Structural Integrity

Film adhesives like AF-163-2 are widely used because of their ability to deliver:

• High peel strength
• Strong lap shear performance
• Resistance to moisture and environmental degradation

These properties make them ideal for:

• Honeycomb sandwich structures
• Solid laminate bonding
• Metal-to-composite assemblies

AF-1000 is engineered to match these performance characteristics while introducing enhanced toughness and durability.

This is particularly important in applications where:

• Dynamic loads and vibration are present
• Bondlines must resist crack propagation
• Long-term structural reliability is required

By maintaining comparable mechanical performance while improving formulation safety, AF-1000 demonstrates how modern adhesive systems can evolve without sacrificing structural integrity.

Honeycomb and Laminate Bonding Applications

A major use case for AF-163-2 (and its equivalents) is bonding in honeycomb sandwich panels. These structures are widely used in aerospace and high-performance composites because they provide:

• High stiffness-to-weight ratios
• Structural efficiency
• Energy absorption capabilities

Film adhesives are critical in these systems because they:

• Distribute loads evenly across the bondline
• Maintain adhesion across thin, lightweight structures
• Enable low-pressure bonding processes

AF-1000 retains this functionality, supporting both:

• Honeycomb core splicing and bonding
• Composite laminate assembly

Its ability to integrate into existing bonding procedures ensures that manufacturers can transition without requalification of entire systems.

Environmental and Regulatory Advancements

One of the most significant technical advancements in AF-1000 is its alignment with modern environmental and regulatory standards.

Legacy film adhesives have historically included materials that:

• Generated strong phenolic odors
• Contained regulated chemical components
• Presented workplace safety concerns

MAKO’s updated formulation eliminates these issues by:

• Removing phenol formaldehyde systems
• Reducing odor during processing
• Improving OSHA compliance

Additionally, AF-1000’s PFAS-free composition addresses growing regulatory pressure around persistent chemicals, making it a future-ready solution for manufacturers.

These improvements are not just incremental, they represent a fundamental shift in how structural adhesives are formulated and used.

Supply Chain and Manufacturing Advantages

Beyond chemistry and performance, AF-1000 introduces important operational benefits:

• Made in the USA, supporting domestic sourcing requirements
• Shorter lead times, reducing production delays
• Lower minimum order quantities, enabling more flexible procurement

These factors are increasingly important in industries where supply chain reliability is just as critical as material performance.

By addressing both technical and logistical challenges, AF-1000 provides a more accessible and scalable solution for modern manufacturing.

Why Film Adhesive Offsets Matter

The concept of an “offset” adhesive goes beyond replication. As MAKO highlights, an offset or alternate product is one that meets or exceeds the performance of a legacy system, or meets the design criteria while improving other key factors such as safety, availability, and cost efficiency.

AF-1000 exemplifies this approach by:

• Maintaining compatibility with established processes
• Delivering comparable mechanical performance
• Improving environmental and handling characteristics

This allows manufacturers to transition away from legacy systems without compromising quality or reliability.

Film adhesives like AF-163-2 have long defined structural bonding in aerospace and composite manufacturing. However, evolving industry demands require materials that not only perform, but also align with modern safety, environmental, and supply chain expectations.

MAKO’s AF-1000 demonstrates how advanced adhesive engineering can build on proven foundations while addressing these new challenges. Through improved chemistry, extended usability, and regulatory alignment, it represents the next generation of structural film adhesive technology.