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  1. #1
    Join Date
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    Default Source of clear heat resisting glass, 6mm thick?

    Anyone know where I can get some small rectangles?
    It's for the door of a bushfire shelter.
    I thought maybe some welding goggles or furnaces windows might be a source?

    Jordan

  2. #2
    BobL is offline Member: Blue and white apron brigade
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    A normal house hold oven uses pyrex type glass that can take a fair bit of heat. It doesn't expand as much as metal so it won't shatter due to heat expansion.
    Just don't try and cut it with a diamond saw - it shatters big time.

  3. #3
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    Lots of 3mm stuff on eBay, could you cut and double it up?

    https://www.ebay.com.au/itm/300X300m...yQe:rk:17:pf:0

  4. #4
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    What about oven door glass?

    It's not 6mm thick, but several layers of it with an air gap in between should be acceptable.

  5. #5
    BobL is offline Member: Blue and white apron brigade
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    The glass from oven doors I have in my stash are 4.7 and 5mm thick.
    BTW I have used the 4.7mm one as a shield ~150 mm in front of my gas powered forge (<1000șC) for many minutes - it gets VERY hot.

  6. #6
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    Murray Bridge S Aust.
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    Look online for Fireplace Glass, found a couple for you. Don't know how close they are to you, but it's a start.
    https://www.thefireplace.com.au/127-...bey-fireplaces
    Glass Replacement for Slow Combustion Heaters & Fireplaces - Macquarie Towns Glass
    Kryn
    To grow old is mandatory, growing up is optional.

  7. #7
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    Default

    Thank you all for the suggestions.
    I wonder if I can cut the glass from an oven door myself.

    Jordan

  8. #8
    BobL is offline Member: Blue and white apron brigade
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    Quote Originally Posted by nadroj View Post
    Thank you all for the suggestions.
    I wonder if I can cut the glass from an oven door myself.
    Well let me tell you that borosilicate glass from oven doors can't be scored and cut - KA-SMASH - the whole thing shattered
    I then tried a diamond wheel on a tile cutting saw - same thing.

    I since found out the reason for this is because it has been tempered and needs to be annealed.
    The annealing temperature depends on the gas - most glass sheet around 5mm thick requires 470șC for around half an hour.

  9. #9
    Join Date
    Sep 2005
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    Any reasonable glass supply should be able to cut a piece of glass that is used in wood heaters, it is reasonably expensive but they just cut it to the size that you require.
    Not 100% sure but i think it is called quartz glass.

  10. #10
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    Quote Originally Posted by BobL View Post
    I since found out the reason for this is because it has been tempered and needs to be annealed.
    The annealing temperature depends on the gas - most glass sheet around 5mm thick requires 470șC for around half an hour.
    I had a friend that did onsite glazing of earthmoving, they score the laminated glass then pour metho over the score line, light it and then snap off the excess. Don't know if that will work on tempered glass?
    Jordan, would it be possible to show a sketch or pic of details for what you're trying to achieve, please. Just thinking, that if the door was placed further back from the enterance, say a metre, then maybe automotive glass might be sufficient?
    Kryn
    To grow old is mandatory, growing up is optional.

  11. #11
    Join Date
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    A simple "peep hole" in the door would do, to let occupants of the bunker know what's going on outside.
    I found a round piece of glass, origin unknown and probably not heat resistant, diameter 60 by thickness 6mm. It has a greenish tinge.
    It could be fitted to the end of a metal tube, towards the outside of the 133mm thick door.
    A hinged steel cover could be at the inside end of the tube.
    The door has a 2 metre long tunnel leading to it.
    I think this glass would be OK, but of course it's the sort of thing to make as well as possible.

    Photos shows door as it is now in construction, with just the inner panel in place.
    At bottom left is a sheet of highly reflective stainless steel, to be screwed over the outer panel.
    Attached Images Attached Images

  12. #12
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    Don't know if that will work on tempered glass?

    The reason burning metho is used on laminated glass is that it will melt the middle plastic layer that is sandwiched between two glass sheets in laminated glass. There is no plastic layer in tempered glass so the metho trick is of no use.


  13. #13
    BobL is offline Member: Blue and white apron brigade
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    Quote Originally Posted by KBs PensNmore View Post
    I had a friend that did onsite glazing of earthmoving, they score the laminated glass then pour metho over the score line, light it and then snap off the excess. Don't know if that will work on tempered glass?
    Laminated and tempered are different things.
    I have cut lots of laminated glass by scoring on both sides and then snapping along the line.
    The internal laminate layer can then be cut with a box cutter.

  14. #14
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    A bigger question is why you are building a bushfire shelter? As far as I am aware all fire agencies in Australia recommend against these as they are notoriously ineffective, although they do keep the bodies nice and tidy for clean up.
    Your absolute best defence is to not be there. Leave early. The current focus for all agencies is early and effective information transfer to the public, thus allowing them to leave. Being caught in a burnover situation is no joke and once you enter your shelter, you are committed. No escape, no second thoughts.
    Deaths occur when people stay in under prepared homes with high fuel loadings around or when they are caught leaving late. No patch of ground is worth dying for and what possible benefit is there going to ground in the path of a fire in an untested fire shelter (or a tested one for that matter)?

  15. #15
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    I agree with your view, and it's what I say to anyone who asks me as a volunteer firefighter - insure and run away if bushfire threatens.
    But that doesn't mean I can know for sure that a fire bunker at home won't be useful, even maybe a lifesaver.
    Moreover, I learnt that most houses are lost to fires that start as ember attacks.
    If I were there to put these out when small, I might save my home.
    I can't do that if I'm not there.
    To leave early or stay to defend is a judgement to be made on the day.

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