new question for lampworkers

Pyrex is the same as boro. It's hot glass - the kind that takes quite a bit
of heat to work. Boro is done quite a bit because of the different look to
it - it can be milky and can change colors drastically. It has a completely
different consistency and it cools a lot slower than soft glass (moretti,
effetre, lauscha, murano, bullseye, etc.)

--
Kandice Seeber
Air & Earth Designs
http://www.lampwork.net

i'm seeing a lot of "pyrex" glass.
why?
does it work differently than the other kinds of glass i hear you
talking about?


-----------
@vicki [SnuggleWench]
(Books) http://www.booksnbytes.com
(Jewelry) http://www.vickijean.com
-----------
It's not what you take, when you leave this world behind you;
it's what you leave behind you when you go. -- Randy Travis

Pyrex is a Corning's brand name for borosilicate glass which uses boron or
borax as a flux instead of soda and lime. It has a COE of 37 I think.
It's\ the glass that carnival glass blowers make hummingbirds and those spun
glass boats and things.
Otherwise see Kandice's post.

--
There are no mistakes, only unexplored techniques
"vj" wrote in message
...
i'm seeing a lot of "pyrex" glass.
why?
does it work differently than the other kinds of glass i hear you
talking about?


-----------
@vicki [SnuggleWench]
(Books) http://www.booksnbytes.com
(Jewelry) http://www.vickijean.com
-----------
It's not what you take, when you leave this world behind you;
it's what you leave behind you when you go. -- Randy Travis

Yep - I knew someone would have a more technically correct explanation.
Thanks Louis!

--
Kandice Seeber
Air & Earth Designs
http://www.lampwork.net

Pyrex is a Corning's brand name for borosilicate glass which uses boron or
borax as a flux instead of soda and lime. It has a COE of 37 I think.
It's\ the glass that carnival glass blowers make hummingbirds and those
spun
glass boats and things.
Otherwise see Kandice's post.

--
There are no mistakes, only unexplored techniques
"vj" wrote in message
...
i'm seeing a lot of "pyrex" glass.
why?
does it work differently than the other kinds of glass i hear you
talking about?


-----------
@vicki [SnuggleWench]
(Books) http://www.booksnbytes.com
(Jewelry) http://www.vickijean.com
-----------
It's not what you take, when you leave this world behind you;
it's what you leave behind you when you go. -- Randy Travis

And, to add to Louis' post, as I understand it, the much lower COE also
means that there are fewer expansion/contraction issues while working (this
point more pertinent to bigger, intricate glass sculptures, probably less
pertinent to lampwork beadmaking).

I would also assume (can someone confirm) that, just as pyrex is used in
scientific and kitchen applications for its strength and resistance to
thermal shock, that pyrex/boro beads are also tougher than soft glass
(assuming proper annealing in both cases...)

--Dave



"Louis Cage" wrote in message
...
Pyrex is a Corning's brand name for borosilicate glass which uses boron or
borax as a flux instead of soda and lime. It has a COE of 37 I think.
It's\ the glass that carnival glass blowers make hummingbirds and those
spun
glass boats and things.
Otherwise see Kandice's post.

--
There are no mistakes, only unexplored techniques
"vj" wrote in message
...
i'm seeing a lot of "pyrex" glass.
why?
does it work differently than the other kinds of glass i hear you
talking about?


-----------
@vicki [SnuggleWench]
(Books) http://www.booksnbytes.com
(Jewelry) http://www.vickijean.com
-----------
It's not what you take, when you leave this world behind you;
it's what you leave behind you when you go. -- Randy Travis

I would also assume (can someone confirm) that, just as pyrex is used in
scientific and kitchen applications for its strength and resistance to thermal
shock, that pyrex/boro beads are also tougher than soft glass (assuming proper
annealing in both cases...)

You would think so, wouldn't you? However, at least with sculptural beads, I
have had many more boro beads break than ANY Moretti or other soft glass beads
(and I am *not* just talking about Ginger here!). Consequently, I actually
steer clear of boro beads, unless they are round. I have been kinda sad to see
the huge trend toward boro lately, because sculptural beads are my *thang* and
they don't seem to hold up in boro (I especially don't like the pendants that
hang from a boro loop). Just my experience and my opinion, of course. :-)

Carol in SLC
New pic (9/5): http://members.aol.com/carolinslc/glorious.jpg

Are you sure that you are using a Boro annealing schedule?


However, at least with sculptural beads, I
have had many more boro beads break than ANY Moretti or other soft glass beads
(and I am *not* just talking about Ginger here!).


New pic (9/5): http://members.aol.com/carolinslc/glorious.jpg

Are you sure that you are using a Boro annealing schedule?

I don't make 'em - I buy 'em! And I sure hope that the lampworkers I buy from
know the difference.

Carol in SLC
New pic (9/5): http://members.aol.com/carolinslc/glorious.jpg

Does Pyrex also have the color shifting associated boro?

Tina


"Kandice Seeber" wrote in message
news:b4i7b.293112$cF.91581@rwcrnsc53...
Pyrex is the same as boro. It's hot glass - the kind that takes quite a
bit
of heat to work. Boro is done quite a bit because of the different look
to
it - it can be milky and can change colors drastically. It has a
completely
different consistency and it cools a lot slower than soft glass (moretti,
effetre, lauscha, murano, bullseye, etc.)

--
Kandice Seeber
Air & Earth Designs
http://www.lampwork.net

i'm seeing a lot of "pyrex" glass.
why?
does it work differently than the other kinds of glass i hear you
talking about?


-----------
@vicki [SnuggleWench]
(Books) http://www.booksnbytes.com
(Jewelry) http://www.vickijean.com
-----------
It's not what you take, when you leave this world behind you;
it's what you leave behind you when you go. -- Randy Travis

Roger Parramore showed me a trick on uneven thicknesses of boro. Put the
piece in the part of the back flame where the yellow flare just starts to
appear. Apparently that is close to where the flame is the annealing
temperature of the glass (works for soft glass too). So you can "flame
anneal" some of the stress out of the piece without losing shape. Of
course, it doesn't replace actual kiln annealing.
Hope that helps.

--
There are no mistakes, only unexplored techniques
"JIM SIMMONS" wrote in message
...





Are you sure that you are using a Boro annealing schedule?


However, at least with sculptural beads, I
have had many more boro beads break than ANY Moretti or other soft glass
beads
(and I am *not* just talking about Ginger here!).


New pic (9/5): http://members.aol.com/carolinslc/glorious.jpg

Thanks, Tink.

Tina


"Tink" wrote in message
...
Borosilicate is just a generic term for low expansion glass. Boron is part
of the composition of the glass, which is where it gets its name. There
are
lots of different borosilicate glasses made with various COEs (e.g.
Borofloat and Pyrex are 32.5 while Barium Boro is 49). The lower the COE,
the more resistant the glass is to thermal shock.

Now, as to color... It's my understanding that the way boro colors behave
is
a function of the composition of the borosilicate glass itself as well as
the elements used to create particular colors. If that makes sense. If you
look at the color data at http://www.glasscolor.com you'll see some great
info! I believe the cool "shifting" effects we see with particular boro
colors are, in part, the nature of the glass itself as well as being
color-specific in some cases. In other words, it's going to look like boro
and not like soda lime glass.

Oh, and Pyrex is to borosilicate glass as Kleenex is to facial tissues.

--

Tink


www.blackswampglassworks.com
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"Kandice Seeber" wrote in message
...
As far as I know, Pyrex is a brand name of borosilicate glass, so if it
comes in colors, I imagine it does have the same shifting effects.
Louis?