“Can you suggest a medium-viscosity adhesive that is well suited for metal-to-metal bonding?”
“We are currently using Dymax 1184-M, M-B, and V for most applications. However, we’ve found out that they are not well suited for bonding metal to metal, partly because the cured hardness is too high and partly because the UV light cannot penetrate through metal seams.”
For metal-to-metal joints I would suggest looking at traditional epoxies rather than light-curable acrylates.
Epotec and Master Bond Inc. offer epoxies in medical-grade versions. There is an old article that describes the impact of Sterrad low-temperature hydrogen-peroxide-gas plasma on several adhesives. The article, along with the results, can be viewed at: http://www.mddionline.com/article/compatibility-medical-devices-and-materials-low-temperature-hydrogen-peroxide-gas-plasma.
According to the results in the article, some two-part epoxies from Epotec have a moderate compatibility with Sterrad.