Comparison of chemical storage bottle materials

Anyone got the data on the qualities of various materials for storing
chemicals? A while back someone posted a chart showing the relative
permeability of glass and various plastics, but I can't find it now and am
lazy. (I remember that PET was good, but I'd like to know just how good.)


--
Don't blame Ralph Nader: blame Gavin Newsom.

"David Nebenzahl" wrote in message
...
Anyone got the data on the qualities of various materials for storing
chemicals? A while back someone posted a chart showing the relative
permeability of glass and various plastics, but I can't find it now and am
lazy. (I remember that PET was good, but I'd like to know just how good.)

Blown PET bottles are the least permeable to oxygen of the common plastics.
Non-blown PET is good, too. So you would then think that pop bottles might
be good for storage - but the caps are often more permeable than you would
like. Same with glass bottles - be wary of the caps.

But permeability to oxygen isn't a huge issue in darkrooms that actually
_use_ chemistry because it's replaced or replenished regularly.

"David Nebenzahl" wrote in message
...
Anyone got the data on the qualities of various materials for storing
chemicals? A while back someone posted a chart showing the relative
permeability of glass and various plastics, but I can't find it now and am
lazy. (I remember that PET was good, but I'd like to know just how good.)

Blown PET bottles are the least permeable to oxygen of the common plastics.
Non-blown PET is good, too. So you would then think that pop bottles might
be good for storage - but the caps are often more permeable than you would
like. Same with glass bottles - be wary of the caps.

But permeability to oxygen isn't a huge issue in darkrooms that actually
_use_ chemistry because it's replaced or replenished regularly.

You can always put a piece of Saran wrap under the cap before screwing it
down. "Original" Saran wrap is made of a different plastic, vinylidene
chloride polymer, than most food wraps, polyethylene, so accept no
substitutes.

--
darkroommike

----------
"jjs" wrote in message
...
"David Nebenzahl" wrote in message
...
Anyone got the data on the qualities of various materials for storing
chemicals? A while back someone posted a chart showing the relative
permeability of glass and various plastics, but I can't find it now and
am
lazy. (I remember that PET was good, but I'd like to know just how
good.)

Blown PET bottles are the least permeable to oxygen of the common
plastics.
Non-blown PET is good, too. So you would then think that pop bottles might
be good for storage - but the caps are often more permeable than you would
like. Same with glass bottles - be wary of the caps.

But permeability to oxygen isn't a huge issue in darkrooms that actually
_use_ chemistry because it's replaced or replenished regularly.

You can always put a piece of Saran wrap under the cap before screwing it
down. "Original" Saran wrap is made of a different plastic, vinylidene
chloride polymer, than most food wraps, polyethylene, so accept no
substitutes.

--
darkroommike

----------
"jjs" wrote in message
...
"David Nebenzahl" wrote in message
...
Anyone got the data on the qualities of various materials for storing
chemicals? A while back someone posted a chart showing the relative
permeability of glass and various plastics, but I can't find it now and
am
lazy. (I remember that PET was good, but I'd like to know just how
good.)

Blown PET bottles are the least permeable to oxygen of the common
plastics.
Non-blown PET is good, too. So you would then think that pop bottles might
be good for storage - but the caps are often more permeable than you would
like. Same with glass bottles - be wary of the caps.

But permeability to oxygen isn't a huge issue in darkrooms that actually
_use_ chemistry because it's replaced or replenished regularly.

You can always put a piece of Saran wrap under the cap before screwing it
down. "Original" Saran wrap is made of a different plastic, vinylidene
chloride polymer, than most food wraps, polyethylene, so accept no
substitutes.

--
darkroommike

----------
"jjs" wrote in message
...
"David Nebenzahl" wrote in message
...
Anyone got the data on the qualities of various materials for storing
chemicals? A while back someone posted a chart showing the relative
permeability of glass and various plastics, but I can't find it now and
am
lazy. (I remember that PET was good, but I'd like to know just how
good.)

Blown PET bottles are the least permeable to oxygen of the common
plastics.
Non-blown PET is good, too. So you would then think that pop bottles might
be good for storage - but the caps are often more permeable than you would
like. Same with glass bottles - be wary of the caps.

But permeability to oxygen isn't a huge issue in darkrooms that actually
_use_ chemistry because it's replaced or replenished regularly.

David Nebenzahl wrote:

Anyone got the data on the qualities of various materials for
storing chemicals?

Here are a couple of threads on the subject:

http://tinyurl.com/6qv4n
http://tinyurl.com/6vgjz

David Nebenzahl wrote:

Anyone got the data on the qualities of various materials for
storing chemicals?

Here are a couple of threads on the subject:

http://tinyurl.com/6qv4n
http://tinyurl.com/6vgjz

David Nebenzahl wrote:

Anyone got the data on the qualities of various materials for
storing chemicals?

Here are a couple of threads on the subject:

http://tinyurl.com/6qv4n
http://tinyurl.com/6vgjz

On 11/6/2004 7:25 PM jjs spake thus:

"David Nebenzahl" wrote in message
...

Anyone got the data on the qualities of various materials for storing
chemicals? A while back someone posted a chart showing the relative
permeability of glass and various plastics, but I can't find it now and am
lazy. (I remember that PET was good, but I'd like to know just how good.)

Blown PET bottles are the least permeable to oxygen of the common plastics.
Non-blown PET is good, too. So you would then think that pop bottles might
be good for storage - but the caps are often more permeable than you would
like. Same with glass bottles - be wary of the caps.

But permeability to oxygen isn't a huge issue in darkrooms that actually
_use_ chemistry because it's replaced or replenished regularly.

Good point, that. But it shows that I'm an amateur who uses chemistry rarely
enough that it *is* an issue in my case, possibly like others here.


--
Don't blame Ralph Nader: blame Gavin Newsom.