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How long can thermal paste last new sealed in box?

I have a friend that seems to have stumbled upon an entire box of Thermaltake TG-7. I know it has to be at least 2-3 years old. My question is, is it still good? I had a tube of the same stuff and it went bed after about a year after opening it. The packaging says that it's good for 24 months after MOB, but I'm not sure if that's just the company covering their rear ends. 

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I know Noctua's NT-H1 has a shelf life of 3 years if unopened and actually used at tube of it that came with my Noctua cooler that sat for over 3 years old and seems to be good. As long as the thermal paste doesn't look like it separated like some tubes of toothpaste. I've also used a tube of Arctic Silver 5 that was over 5 years old and worked pretty good to be honest. 

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CPU: Intel i9-10980XE 18C/36T  ||  CPU Cooler: Noctua NH-D15 Air Cooler ||  RAM: Corsair Vengeance RGB Pro 64GB(8x8GB) DDR4-3600 CL18  ||  Mobo: MSI X299 Gaming Pro Carbon AC  ||  SSD: Samsung 970 EVO  1TB M.2-2280 Boot Drive/Some Games)  ||  HDD:2X Western Digital Caviar Blue 1TB(Game Drive)  ||  GPU: MSI RTX 2080 GAMING X TRIO  ||  PSU: EVGA P2 1600W  ||  Case: Corsair 900D  ||  Mouse: Logitech G502 Hero SE RGB  ||  Keyboard: Logitech G513 Carbon RGB with GX Blue Clicky Switches  ||  Mouse Pad: MAINGEAR ASSIST XL ||  MonitorMSI MAG271CQR 144HZ 27" 


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I have a big tube of thermal paste i bought 10 years ago, still good.

If it's still gooey / wet i think it's good.

Ryzen 2600 @ 4ghz | Radeon RX580 | 32gb HyperX 3200mhz | 500gb Samsung PM981a | 5 TB HDD | Corsair CX450

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