Quick question - Acrylic

[Locksley]

As stated in the sticky Acrylic tops will eventually crack and I wonder:

1. Is that still true with todays A. tops?
2. Why - is it the heat and pressure, additives?
3. I've changed my order to Acetal tops - are they a better choice?
4. I'm ordering a spare pump and it's tank is made of Acrylic - wrong choice (most tanks seem to be made of A.)?

I'll rather wait and do it right than rush and be sorry

Cheers!

EDIT: - Answers to the question of Acrylic.

---> Cracking will not be a concern if proper care is taken. (unless it is faulty from the factory :P )

1. Overtightening the barbs will stress the plastic; especially with todays somewhat convex plates.

2. Gasoline and alcohol will alter the structure of the plastic crystals? thus making it more brittle.

3. Stress like the pull of tight tubing "might" have an influence.

4. UV lights affecting acrylic properties? [EDIT:Seems like there is agreement on this from more people - so keep it in mind. End edit] More input needed, although VERY strong UV will affect many things I don't know if the lights used in modding are that strong.

5. Acetal can take more punishment.

Thank you all for your continues input.
Cheers!