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I have a question for the materials experts among you: when I modeled the cover board for the third rail on my subway layout, I used 0.5mm thick x 4.8mm wide styrene sheet. I did this during the cool weather. When it got warm, and the temperature in my attic was in the high 80's, the cover board expanded, causing it to undulate crazily between the supports. When the temperature subsided to the low 70's or less, the styrene returned to a normal, level position between the supports.

My question is, if I use 0.5mm thick brass strip instead of styrene, will it behave the same way in the warmth? More? Less? I guess what I'm asking is whether the coefficient of thermal expansion of styrene is more or less than that of brass?

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