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The materials and processes used on the F-117 were so secret, the Material Safety Data Sheets or MSDS’s were unavailable and in many cases proper and safe handling of toxic materials were not informed and workers were exposed to them without protections in place. (The author had several friends and coworkers whom had worked at either Palmdale Skunk Works or Burbank, and some whom certainly were often at “The Ranch”, which didn’t exist. They have all passed away from persistent and somewhat unusual diseases and ailments).The engine exhaust thermal signature was dealt with in buried engines within the airframe covered with low observable, radiation absorbing materials. Exhaust on upper surface creates little IR signature detectable on the ground. Ambient air was mixed in with engine out flow further reducing the heat signature. The SR-71 had a similar mix, but possibly incidental as a solution to a different problem. The airframe general configuration and layout design with alternate unusual angles was meant to confuse radar return signals. The Northrop Grumman B-2 Spirit benefits from these features.It is interesting the British RAF Avro Vulcan strategic bomber developed in the late 1940’s and early 1950’s proved difficult for ground radar to track during test flights. It was decided a dedicated transponder would be fitted to ensure accurate flight data during development of the bomber. Without intending or even realizing it, Avro and the RAF had this marvelous behemoth airplane and it was a Stealth Bomber.

I'd start atIsopar™ isoparaffinic fluidsand click the Contact Us tab on the top right. ExxonMobil sells many kinds of hydrocarbon fluids, in 55 gallon drums, properly shipped, and with Material Safety Data Sheets to help you stay out of trouble. I just happen to know the Isopars and Norpars best.

Here’s what Wikipedia has to say about Astatine: nobody knows what it looks like and it’s probably metallic in appearance.In his book, What If?[1], Randall Munroe (from xkcd) tackles the hypothetical scenario of making a real-life periodic table made out of cube shaped bricks where each brick is made of the corresponding element. When he arrives at the sixth row, he notes that there are quite a few radio-active elements in this row, but he specifically warns against Astatine, describing it as “the bad one” (out of all the elements in the sixth row) and proceeds to explain why. Here’s an excerpt from the book:We don’t know what Astatine looks like, because as Lowe put it, “that stuff just doesn’t want to exist.” It’s so radioactive (with a half-life measured in hours) that any large piece of it would be quickly vaporized by its own heat. Chemists suspect that it has a black surface, but no one really knows.There’s no material safety data sheet for Astatine. If there were, it would just be the word “NO” scrawled over and over in charred blood.He also notes that the explosion from a brick sized block of Astatine would be “just the right size to maximize the amount of paperwork your lab faces” (a smaller explosion can potentially be covered up and a larger one would leave no one in the city to submit paperwork to!).I don’t know if this makes Astatine the craziest element in the periodic table but it’s definitely up there!Footnotes[1] What If?: Serious Scientific Answers to Absurd Hypothetical Questions