Duran® borosilicate glass

[PolytheneSam]

I saw some Duran® borosilicate glass tubing in a HVAC/R store.  I wonder how that would work in a tube furnace.  It is rated as borosilicate glass 3.3.  The lower the number the less thermal expansion.  Its highly resistant to thermal shock, too.
http://www.geocities.com/dritte123/PSPF.html
The hardest thing to explain is the obvious

[terbium]

It seems to have the same specs as standard Pyrex brand laboratory glass.

http://www.us.schott.com/tgd/english/products/duran.html

http://www.besoptics.com/html/corning_pyrex.html

[smutboy420]

YOU are right duran borosilicate glass is just about the same as pyrex. pyrex is 32.5 c.o.e and duran is 33 c.o.e
but that wont effect its profomance in a furnace. cause they are both LOW thermal expansion glasses. duran just is not as clean of a glass to blow with as pyrex is and duran will take 1 more degree f. to melt thats a big plus right? duran is some thimes cheaper then pyrex to. if its the right size and it fits go for it. if not i know of a good supplier of duran tubes sold as single tubes. duran also comes in 5 foot tubes and pyrex only is made in 4 foot.

[PolytheneSam]

Yeah, I found that Schott site before.  So its no better than pyrex or is it better, ie. more resistant to heat shock and less likely to break?
http://www.geocities.com/dritte123/PSPF.html
The hardest thing to explain is the obvious

[smutboy420]

same resistants to heat shock and just about as likely to break or not break. for what you need it for its all the same just anouther brand is all. for art and blown stuff it makes a difrence. cause pyrex is not realy good clean glass its full of scuz and air bubbles. the best all around glass is simex. ever look at your lab glass and see tiny faint lines that run along the glass? end to end. or bettter yet on a bong wher it changes color you can realy see it if it was made out of corning pyrex. but usealy not with the other brands. but that will not matter for your tube furnace. so if it fits get it. if it don't fit what size does it need to be? have you considered quartz tubeing? NO thermal shock.

[wyndowlicker]

swiw is also a glassblower and would have to say that schott-duran is definetly better glass than cornings pyrex.
its all boro silicate though.The schott is shinny as hell because of the lake of blue in the tubing schott has like a light green shimmer to the glass when you look at the end of a tube.This is mostly for art glass.Swiws inside out pipes are crystal clear.Also german made got to bee better.
cheq.glass is supposed to bee the best.Dont know any company names though.Any glass should work though its just a matter of quality.
I will choke untill I swallow!Who are you to judge or strike me down!Miss you Kerra!

[PolytheneSam]

>have you considered quartz tubeing? NO thermal shock.

So, you think quartz tubing would be better in a tube furnace (less chance of breakage from thermal shock)?  Where do you get 3/4" or 1" O.D. quartz tubing and what is the price range?

http://www.geocities.com/dritte123/PSPF.html
The hardest thing to explain is the obvious

[terbium]

Pyrex glass is fine for a tube furnace if you are within its temperature range. As long as the temperature is below where the pyrex will soften and flow. I have used pyrex glass in a tube furnace for catalytic dehydrogenation of alcohols.

For higher temperatures go to a scientific glassblower and ask to buy a length of Vycor tubing.

http://www.corning.com/lightingmaterials/products/vycor.html

[smutboy420]

you can find Vycor tubing and others at www.fdglass.com
i hope this don't count as naming sources sence it not any thing that's hard to find of watched. wyndowlicker. you want to tri some sweet glass for art stuff? get hold of some of that new german glass. Eigenschaft many blowers think its simex but its cleaner then simex even. the sweetest glass i have ever ever ever seen. cheep too.

[wyndowlicker]

Ok just to clear this up quartz tubing and any borosilicate glass can bee purchased from a general glass supplier very large and are a corning wholesaler.50  usd min order(for you euro bees)dollar[url=http://glasscraft.com quarts is very hard to work not to mention expensive.Its very bright you have to use a welder grade didium(spelling isnt right)glasses and alot of confidence in your feel of the glass since site is extremely inhibited.Quarts isnt necessary.Pay someone to make it plenty of chem glass blowers that need work.Help out our bros they help us get honey to.
I will choke untill I swallow!Who are you to judge or strike me down!Miss you Kerra!

[smutboy420]

yes quartz would be over kill. inless you need to bee going that high of a temp. PM me and i can help you out if you don't want to have a min. order from a glass supply house.