No kenyan coffee was harmed in the making of this pour over...

I recently ordered a nice glass hario server in red (to match my cups) and it came with a cheapy plastic V60 pour over cone, so I thought i would do a quick, albeit unscientific test. 

I wanted to see if the plastic cone could hold heat as well as my glass chemex. Obviously, glass and ceramic are far better conductors and retainers of thermal energy, so i was not expecting the plastic to be anywhere near as good. Turns out i was right... although with a very thorough pre-heating of the plastic cone you could probably still serve up a fairly decent pour over beverage and the temp difference was marginal.

Hario clearly advocate the pouring in the middle technique:

I would throw away this little plastic scoop... i weighed out just 10g of ground coffee when filled to the brim - not nearly enough for a 12oz beverage as per the marking on the scoop. I prefer 15g of coffee for around 250ml, but it depends on the coffee.

Water was allowed to cool to 96 degrees before beginning the pour sequence... as you can see, there is quite a lot of thermal loss involved in pour over. We are nowhere near 92 - 96 degree espresso temps. Both chemex and plastic v60 were preheated with 300ml of boiling water.

Plastic @ 86 degrees first pour - thermal loss of 10 degrees already:

End of second pour, coffee bed has dropped to 81 degrees:

Glass chemex @ 88 degrees first pour - thermal loss of 8 degrees (slightly better than plastic v60):

End of second pour, coffee bed has dropped to 83 degrees:

 

Both the v60 and chemex lost 5 degrees throughout the pour over, though the chemex retained more heat at the start. 5 degrees lost during the pour isn't too bad, but you really need to preheat the plastic v60 more thoroughly, and i think if you waited around before beginning the pour the plastic would lose heat at a faster rate than the glass.

So plastic is probably OK if you preheat well, but it's not quite on par with glass.

Taste wise I think technique and the coffee itself will have far more effect on your brew. For this experiment, my technique was pretty awful as i was juggling the camera, and i was only using some rubbish coffee i had lying around.