1 Topic by jnadke (edited by jnadke 2015-05-06 22:33:05)

  • jnadke
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Topic: Pyroceram Glass for heated bed

So, I was looking at sources for a chipped bed, and called a local glass company looking for "fireplace glass".

They had Pyroceram glass and an 8" x 8" (asked for rough estimate - 3/16" thick) sheet runs $22.


I was looking this stuff up, it seems superior to Borosilicate Glass in every way:

Borosilicate Glass vs Pyroceram Glass
Thermal Conductivity:   1.14 W/mK vs 3.96 W/mK (3X more)
Thermal Expansion:   3.3 E-6 vs 0.30 E-6  (10X less)
Knoop hardness:   470 vs 705 (2X harder)

Knoop hardness is if you take a needle (diamond) and tried to impact the glass, how far will it go.  Higher the number the less it will indent.

$20 isn't bad, and the stuff seems pretty awesome.  It's sold by several other names (re-branded).


Most importantly, the stuff has wicked thermal shock abilities.  It's designed to go from 100 C to 0C in a moment without cracking.


So if you end up replacing your bed under warranty or otherwise, call your local glass companies.

2 Reply by jnadke (edited by jnadke 2015-05-07 03:34:05)

  • jnadke
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Re: Pyroceram Glass for heated bed

It looks like someone else has paved the way and used this material:

http://devdonkey.blogspot.com/2013/04/c … prusa.html


Also, OneDayGlass sells it online:

https://www.onedayglass.com/order-online/

3 Reply by TheBaron

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Re: Pyroceram Glass for heated bed

I use that kind of glass, actually. I got it for a couple bucks a sheet at a surplus store. never had any problems with it.

SD3 w/ RUMBA (8825s), merlin hot end (in pieces). Ender3 w/ silent board for PLA printing. Ender5 w/ silent board, e3d v6, new z lead screw, and glass bed. DiY Kossel w/ smoothieboard (in pieces). Vellman Vertex (in pieces)
Shapeoko2 router in process of being converted to laser engraver (in pieces)
Multicam 5000 series CNC Router w/ 11HP spindle, 5x10' table, and auto tool changer (in pieces)

4 Reply by jnadke

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Re: Pyroceram Glass for heated bed

Neoceram is interesting stuff.

It has similar hardness to pyroceram.  It does have poorer thermal conductivity (similar to borosilicate glass).

But it actually has a negative thermal expansion coefficient.  Meaning it shrinks under heat.  It's very small (-0.4 E-6).


Could make for parts that pop off the bed themselves.

5 Reply by TheBaron

  • TheBaron
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Re: Pyroceram Glass for heated bed

I'll make some phone calls on my way home from work today, see if my surplus supply people can locate some more sheets of fireplace glass I can share with the community. If I can get a hold of some, I will let you all know big_smile

SD3 w/ RUMBA (8825s), merlin hot end (in pieces). Ender3 w/ silent board for PLA printing. Ender5 w/ silent board, e3d v6, new z lead screw, and glass bed. DiY Kossel w/ smoothieboard (in pieces). Vellman Vertex (in pieces)
Shapeoko2 router in process of being converted to laser engraver (in pieces)
Multicam 5000 series CNC Router w/ 11HP spindle, 5x10' table, and auto tool changer (in pieces)