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coefficient of thermal expansion...
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This has already been established earlier in the thread by me... first page, I think. Also, I used a UV diode and a stereo microscope to inspect my blocktop for microcracks. I found NONE. This may be attributed to mere blindness on my part or the fact that all holes were machined using endmills of lesser diameter than the holes themselves.
Anyhow, I think the whole discussion about poly tops cracking is slightly overrated. In my oppinion, the chance of getting a leak from a poorly bonded straight through tube connection is much more likely.
How many DangerDen blocks have cracked...? perhaps 5 (just a guess)... how many have been sold? 10000 perhas?
Let's see some statistics... and also can anyone locate the data that I requested earlier?