Thread: glass jar

thanks! that looks like a better solution than using tupperware containers in the big vac chamber. I'll take a look at Coles at lunch time today.

Looks good so far but please be very careful, glass is extremely slippery with Cactus Juice or similar stabilising resin. Also, 20 hours in the dehydrator may not be enough, they need to be 100% dry (ie 0% MC) for stabilising.

I'm in process of testing at the moment as Curtis (maker of Cactus Juice) recommends for dry wood (ie less than 6%MC) to still stick it in an oven for min 4 hrs at 120 C

i have had those blanks sitting on a shelf for many years and i dont live on the coast .

johno

Yeh Johno, but Curtis tells me the dehydrator doesn't get it down to 0% MC, you need to have temp >120 C to get last bit out. Not that I have ever had issues, out of interest my intended testing is taking from dehydrator to oven, to see if it loses more weight.

If you pull most of the air out of that jar there is an equivalent of 1500 lbs of force inwards on the sides of that jar.

This means if there is a slight flaw in the glass or it gets knocked while under vacuum that the gas could implode and may explode outward creating a cylinder of outward moving glass

Yes it may never happen, or it may happen when there is no one around.

There is a very simple risk reduction strategy and that is to put the jar inside a metal or thick plastic container.

The standard way this is done in laboratories is to use a thick wire mesh chamber that sits over the top of the jar.

i put it in a 20lt plastic bucket for that very reason or more to save mess if the manure did hit the fan , however i could not get a photo of said setup while the whole lot was in the bucket .

johno

Originally Posted by texx

i put it in a 20lt plastic bucket for that very reason or more to save mess if the manure did hit the fan , however i could not get a photo of said setup while the whole lot was in the bucket .

johno

Just thinking of the newbies.

Glass jar is perfect! However they were out of stock of the 250mm tall one, only had one about 150mm tall but it does the job nicely. Thanks for the tip off! Got coffee beans in cactus juice stabilising right now.