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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.

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Question: Can disinfectant really expire? If so - how?Expire like food and beverages?No.Lose its potency or break down chemically and become inert?Possibly.Any chemical compound needs to be stored under certain conditions to remain effective. If a disinfectant was stored at warmer than normal condition, if it is exposed to UV sources (like direct sunlight) for too long; or if it is allowed freeze and thaw multiple times, it could potentially lose it potency or even become inert.In the United States, all chemicals and chemical compounds that are sold come with documentation called a Material Safety Data Sheet (MSDS) or Safety Data Sheet (SDS) , which among other things, will tell users about the composition of the substance. If you read the MSDS/SDS, you should be able to tell what types of conditions are the most safe and effective to use the chemical in; and they also provide information concerning storage conditions for that chemical.Disinfectants usually cannot “expire” in the sense that Food and beverages do.They can, however, lose their ability to disinfect completely and they could potentially become inert.Reference:Hazard Communication Standard: Safety Data Sheets