Chromis
Supporting Member
Interesting, well TAP Plastics sells polycarbonate as well as acrylic and can give advice on how to bond/machine it. They once told me that acrylic has more of a tendency to shatter during drilling than polycarbonate.
Anyone ever tried making their own acrylic lid?
- Thread starter Ibn
- Start date
scuzy
Guest
They told me polycarbonate needs a special bit.
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First, remember the physics : diffusion rate depends on the difference of concentrations.
With a lid, it is not air tight, but the air is very still, and there is little circulation.
So O2 concentration will drop, CO2 will rise. Not to deadly levels, but it will change.
And in particular, at the surface, because air is still, it could drop quite a bit locally.
That will affect the rate of air exchange.
It can be tested!
Grab some tank water in a cup, quickly drop your PH meter in, and put the cup just outside the tank.
Wait a couple of hours, stirring it occasionally.
Did PH change a lot? If so, you may have poor air exchange.
(Some change is normal)
(No, I don't have numbers, but I think they out there)
It is easy to see also!
Is your lid totally coated with condensation inside?
If so, it is air tight enough that humidity went way up.
That likely means air is stagnant enough to have O2/CO2 variations.
I have never noticed much of a difference.
About as much as Cast/Extruded.
Usually the problem for me is melting not shattering.
Maybe I go too slow?
