3M™ Structural Adhesive SA9816

A Two-Part Structural Adhesive for Greater Design Flexibility
Formulated for galvanized steel or aluminum hem flange bonding, 3M™ Structural Adhesive SA9816 is excellent for applications involving very high lubricant coating weights with good induction reactivity, which are important factors for fast lock-up.

When properly cured during the e-coat bake, the adhesive achieves structural bond strength to lubricated steel and aluminum. It is also compatible with dry film lubricants used on aluminum surfaces. It has a very long dwell time (up to 14 days) before e-coat bake. Its low activation temperatures minimize panel distortion, and provide excellent off ratio and over-bake tolerances. It also can be spot cured.

Since manufacturers can pre-set automotive panel assemblies, 3M™ Structural Adhesive SA9816 can eliminate the need for body-in-white ovens and additional fixturing outside of the hemming cell. This can reduce the potential for panel distortion on aluminum hems.

An Adhesive for Enabling Lightweight Design
As automotive OEMs are using more and more lightweight materials such as aluminum and thin steel panels, the hemming process for hoods, trunks, and doors becomes more complex.  The need for mixed material joints is growing, as well as improved vehicle stiffness and better driving characteristics without sacrificing reliable manufacturing processes.

3M™ Structural Adhesive SA9816 eliminates the expense of pre-cure ovens associated with 1K solutions on aluminum parts, and helps significantly reduce quality defects during production. It can be pre-cured with induction to prevent parts from moving during transport or during the e-coat bath before final bake. This helps minimize aluminum panel distortion after the e-coat oven, increases design flexibility and reduces cycle time.

A Two-Part Structural Adhesive for Greater Design Flexibility
Formulated for longer dwell times and lower cure temperatures, our 3M™ Structural Adhesive SA9816 is ideal for bonding newer materials such as carbon fiber in automotive OEM structures and sub-structures. This two-part epoxy adhesive affords the bond strength of a one-part adhesive and exceeds the stiffness, strength and crash performance of premium two-part structural adhesives. It can be induction cured at temperatures as low as 115°C (239°F), which allows for carbon fiber and other components to be effectively bonded to metals such as aluminum without distortion or resin degradation. The adhesive features controlled reactivity for a longer work time (approx. 1 hour) and proper panel lock-up after induction heating for accelerated curing.

An Adhesive for Improved Production Efficiency
3M™ Structural Adhesive SA9816 also may be stored for up to 14 days, increasing the flexibility during production. The non-sag, non-slump formula delivers excellent gap-filling properties and can be applied either robotically or manually for low-volume or premium higher-volume OEMs.

Better Science for Better Adhesion from 3M
Since 1925 when one of our lab assistants invented masking tape, 3M has been applying science to life –developing adhesive products and technologies that help entire industries and individual businesses worldwide. The work that began with a single 3M engineer now spans decades and generations – and all of it goes into each of our products developed for automotive OEM, like 3M™ Structural Adhesive SA9816.