Courtney's questions about makeup of stripped lowers

Hey guys,

I just purchased two stripped lowers to build for my two little boys (future toys/life preservers) - I was looking for aluminum ones. I bought a polymer one bc I found one for $70 (yes a week ago), and bought a Generation 4, Alloy one from Mag Tactical for $150. Can someone please send me a link educating me, or their own response on: aluminum, alloy, and polymer "grades" (esp the first two- metal ones) - what i mean exactly is: i know oftentimes the aluminum that is used for these lowers is 7075-T5. Then i see 6066 T6 aluminum. and 8625. Which ones are the most durable, relatively speaking- and what does the T4-T6 etc. all stand for? and which are alloy. and lastly- are there different grades/qualities of polymer as well? And yes- I am looking for a "boring" chemistry class/gun smithing/etc-type of DETAILED explanation please! and thank you!
Courtney
p.s. Boring = Exciting (for me in this case)
 

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