"Wm Hopkins" wrote in message
news

"Harry Muscle" wrote in message
...

So in other words, unless I stick it in the tank and wait for my fish to
die, there is no way for me to find out if it's going to cause any
problems.
Bummer. Maybe I should stick with using slate tiles.

Thanks for the info,
Harry

P.S. Are porcelain sinks, toilets, etc. glazed? Or are they smooth and
water repellent naturally?



You may be talking two different products here. A porcelain sink (kit.) or
tub etc., is cast iron or metal with a glaze baked on. Pedestal Lavatories
(bath) or toilets are usually vitreous china with a glaze. Tile OTOH can
be
made from just about anything these days - concrete impregnated fiber to
recycled glass. Most manufacturers will tell you what they use but
contacting them can be interesting.


tubs and some kitchen sinks are usually porcelain on metal. toilets and
bathroom sinks are usually porcelain on some clay body that's been fired to
porcelain temps. the clay body could be a porcelain or not. if you go into a
pottery supply place, they might have 25 different clay bodies in 25 lb
blocks, some of which are classified as a porcelain.