We have experience with all kinds of harsh environments:

Temperatures to 500+ ˚C
Pressures to 25,000+ psi
Radiation, both Gamma and Neutron
Molten metal immersion including molten Zinc, molten Sodium, and molten Lead Bismuth alloys
Downhole chemicals such as sulfides and chlorides
Fuels, oils, and acids
Downhole shock, impact, and abrasion
Autoclave and chemical sterilization conditions