Wooooopsies I added too much heat to my vacuum

[Primalraindrop]

Hey. So i was wondering 2 things, first what would happen if i heated my jar to a crazy temperature like 200 or so. second i was wondering what happens when your vacuum container implodes.... so I have half gallon jars as a vacuum chamber. below is a pic. i heard the sound of grinding glass. i immediatly turned the heat source off along with the vacuum pump. this is what happened in about 20- 40 seconds of "high heat" 200-300 somewhere in there.

 

[CarefulGrower]

It's why using mason jars is dangerous, they are not designed for this application.

http://skunkpharmresearch.com/diy-vacuum-purging-chamber/

 

[Primalraindrop]

careful grower. if i drop the jar. ill be "careful" not to cut my finger on the sliced glass....

 

[m314]

I use a quart mason jar as a cheap vacuum chamber with very low heat. I don't see much of a risk even if the jar breaks. It seems like there's more danger involved just smoking out of a bong. I actually have cut myself stepping on a little piece of glass after dropping a bong.

 

[Gray Wolf]

Glass will handle the load under compression far better than tension, so it is stronger under vacuum than pressure.

Never the less, it still has to be thick enough for the area under pressure, so the larger it is, the thicker it has to be to withstand the load.

Glass has about the same modulus of elasticity as aluminum, which is about one third that of steel, so the same dimensioned glass beam will deflect about three times as far as a steel beam under the same load.

Steel and aluminum however, have more difference between ultimate yield and tensile strength. With glass, when it has flexed as far as it is going to, it doesn't relieve additional stresses by yielding (bending), it just breaks, because yield and tensile strength are for all practical purposes the same.

Yield and tensile properties are also affected by heat, so when you heat jars, their strength drops.

I've vacuumed canning jars, but never larger than a quart. I've never imploded one, but have cracked enough glass setting it into oil that was too hot, or tinking them too hard with a metal spoon while stirring in hot oil, to have mostly stopped using them in processing.

I prefer the stainless Bain Marie pots, which you could convert to a vacuum pot using a Polycarbonate or Acrylic lid.