3M™ Scotch-Weld™ Structural Adhesive EC-7236 B/A

3M™ Scotch-Weld™ Structural Epoxy Adhesive EC-7236 B/A is a two-component epoxy adhesive which cures at room temperature or with mild heat to form a strong, impact-resistant structural bond. It has an excellent adhesion to a wide variety of substrates such as metals, ceramics and plastics, including composite reinforced materials. Once cured it provides extremely high mechanical strength over a wide temperature range, with excellent resistance to harsh environments and chemicals, commonly encountered in aerospace applications. The product is available in a white and a black version.

The mix ratio is 3:1 (B:A) and the adhesive provides a 60 minute work life to allow time to adjust fit prior to setting. The adhesive reaches handling strength in approximately 3-4 hours and is fully cured in 14 days at 72°F (22°C). You may purchase it by the can or by the pail.

What Are Epoxy Adhesives?
3M™ epoxy adhesives are part of the class of adhesives called "structural adhesives," which also includes polyurethane and acrylic adhesives. Epoxy adhesives are typically formulated with reactive components (Base and Accelerator) that cure when mixed to form a solid plastic material. 3M provides epoxy adhesives in multiple formats to support your processing needs:

Two Part– In this format the Base and Accelerator are stored separately which enables the adhesive to have a long shelf life even when stored at room temperature. These materials are available in a duo-pak cartridges for use with the 3M™ EPX™ Applicator System, enabling you to simultaneously meter, mix and apply two-part adhesives. For larger scale operations, you can purchase these in bulk. Because these parts are mixed at point of use, you can reduce waste by saving non-mixed unused material for a later job.

One Part– In this format, 3M does the mixing for you and ships it frozen. You store it in a freezer, then remove and thaw it when you’re ready to use it.

Adhesive Films– In this one-part format, 3M not only does the mixing for you, but also turns it into a film that can be specifically cut to size and placed into your bond line. 3M offers a variety of films in different weights/thickness and supports. These films must be stored frozen.

In a two-part epoxy adhesive, once the two parts are mixed in their specified ratio, they begin the curing process and offer a limited working time where the adhesive can be applied and the two surfaces positioned as needed. Similarly, in a one-part adhesive there is a limited out time after which material is thawed during which it must be used. This work life or out time lasts anywhere from a few minutes to 48 hours or longer.

In general, epoxy adhesives provide high shear and peel strengths and have good environmental resistance. These adhesives are preferred for their ease of use, mechanical strength and chemical resistance. Depending on the formulation, epoxy adhesives can be flexible or rigid, transparent or opaque, quick setting or slow setting, high flow or low flow, room temperature or elevated temperature cure. Epoxy adhesives are among the strongest adhesives available, making them well-suited for jobs requiring strength and durability.

Our Best for Your Best
3M is proud to partner with organizations across the spectrum of aerospace and related industries. Enabling efficiencies, reducing process times and lowering aircraft weight is how 3M executes a never-ending mission to offer best-in-class adhesives, sealants, surface protection products and composite resins that effectively reduce costs on multiple fronts. Professionals across the industry know the numerous advantages of 3M Aerospace. The 3M brand is widely recognized for the highest standards of quality and performance, adding value to the final results. By engineering reliability, longevity and value into all of its products, 3M have a history of saving money by reducing waste, rework and time.