"Is there a temporary adhesive to bond glass and withstand 1400°F?"

Before this question can be answered, we need to ask for the definition of temporary. Only some materials will withstand up to 1400°F. Companies like Cotronics Corp and Aremco (to name a few) offer high-temperature adhesives. These adhesives are often modified with fillers like Alumina, Zircon, mica, ceramics, etc. that allow the adhesive to withstand higher-temperature environments. Some materials, including liquid materials or tape-type products, have a continuous service temperature of 1500°F, and a melting point of 2800°F. So in one sense, it is permanent at 1500°F, but temporary as you raise the temperature. Some epoxy systems can withstand up to 400°F and 500°F, so the question becomes - how long does it need to survive at 1400°F? If the answer is minutes, then finding a material that can survive short bursts of high temperature for only a little while may be sufficient. There are a number of different chemistries available such as silicone or epoxy. Typically, unfilled organic adhesives like acrylics and urethanes will break down long before 1400°F.

Other questions to ask are about which properties are required, such as: Does it (the adhesive) need to be clear or is opaque okay, or how do you want to remove the material? Unfortunately there isn’t a simple answer to this question. Some of the technical support groups at these companies may be able to help further, or recommend other options for you to consider.

Adhesives acrylics, adhesives modified with fillers, alumina, epoxy adhesive chemistry, epoxy system, high-temperature adhesives, higher-temperature environments, mica ceramics, permanent adhesive, silicone adhesive chemistry, tape-type products, temporary adhesive, unfilled organic adhesives, urethanes, zircon

“I need a medical-grade adhesive to bond Ultem material to stainless steel (SS). This product will be a reusable medical product that will be autoclaved for 30 minutes @ 250° F”

To bond materials like Ultem and stainless steel, for a reusable device that will see autoclave conditions, the right choice in adhesives is important. As a general category, acrylates, urethanes, and cyanoacrylates will survive only limited autoclaving. Epoxies and silicones will have better success. Ultem is a difficult material, but with proper evaluation you might find a successful candidate. Silicone materials are available from companies like Dow Corning, Momentive, NuSil, and Wacker. Epoxy materials can be obtained from Epoxy Technology, Henkel/Loctite, and numerous others. Silicones will be softer and flex with the thermal stresses, while epoxies will be more rigid. It will ultimately depend on the part design and the number of autoclaving cycles the part will see.

Adhesives, Medical autoclave, CA's, Cyanoacrylates, Epoxies, Medical-Grade, silicones, stainless steel, ultem, urethanes