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Christian,
You never have asked a question. You just wrote that I said Gadget is wrong. But I'll take a guess at what you're after, namely DOT 5 and silicone brake fluids.
Like I already said, DOT5 is a boiling point. SAE test specifications for DOT5 fluid require the fluid to not boil until 500 degrees when dry, and 350 when wet. Any fluid achieving or exceeding that value can correctly be labeled DOT5. There's a number of other requirements of a DOT5 specification, but that's the important part for this thread.
Currently, the only brake fluids commonly available at automotive stores that meet the DOT5 boil points are silicone. This silicone fluid is cheap to make and as such is marketed as DOT5 brake fluid. Hence the natural mistake of equating DOT5 with silicone brake fluid.
Go over to the racing side, and you will come across non silicone DOT5 brake fluids, as well as different types of silicone DOT5 and higher brake fluids. Due to the racing nature of the application there generally isn't much concern with meeting the dye color specifications of DOT5 (must be dyed light purple), so it is up to the reader to figure out what they are looking at. NEO610 is a handy example of this.
So in quick summary:
1) DOT5 is a test specification.
2) Silicone fluids meet these test specifications.
3) DOT5 does not specify the fluid be silicone.
4) Fluids other then silicone can meet the test specifications.
5) All the DOT5 fluids you find at Walmart will be silicone.
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