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Offlineblackout
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Using glass petri tops & bottoms as lids for deeper plastic plates.
    #23787813 - 10/31/16 08:42 AM (7 years, 2 months ago)

I have glass petris but usually use PP dip containers for agar, or shallow glass jars with metal lids, but I like glass petris for their clarity. Pouring agar is not convenient for me so I prefer no pour. I did a batch of no pour glass plates and about 30% boiled over, which is what I usually get as they are so shallow. Taller glass petris can be got but are rarer and usually cost more.

I found the base of my glass petris fits very nicely on top of my dip containers (satco brand). I have an excess of PP dip bases as some lids broke or were lost. I also have broken some petris and pair them with lids/bases but have more intact petri bases.

This is my glass petri upside down, the base is quite loose in the lid which is normal


photo of the same straight down, (the one above was at an angle and looks like a big gap at the 11 o clock region)


I wedged a glass base into this PP container. I was cutting this container so the wider glass lid would sit on it.

You can barely see a green line I drew around the container below the level of the petri base. To draw this line I held a marker flat on some dvd cases on a table and spun the container around on the table so the line was level all around. I then cut just above this green line all the way around the container, you want to cut slightly below where the base was, since the outside diameter at that point is going to be wider than the base which is wedged inside. I then flamed the edge to smoothen and strengthen it. The glass cap fit pretty well on it, it is on the right below


Cutting the container is tricky, the plastic can break and a crack will "run", I cut roughly higher up and then trim down towards where I want. Another way to get a nice smooth top would be to sit the glass top on the plate and then heat the plate with a heat gun. But this has to be done slowly or it would crack, the idea would be that the glass would heat up and melt the base below so it would have a nice seal -but maybe it would stick to the glass. The plastic cut base could also be rubbed/twisted on fine sandpaper to level the edge.

Another method might be to have a heated blade kept level like the marker, and spin the container around so the hot blade cuts it. A cold blade might work too but might take several spins to weaken it. A fine metal file might also work, slowly wearing down the plastic.

I usually PC my PP plates at lower pressure as they can deform, with dishes like these I would not be too concerned about that as the lids are loose. I usually put my plates in regular thin sandwich bags, which shrink and bit and cling to the plates, this keeps the lid on and stops contams getting in, both while cooling and in storage. As each petri now becomes 2 lids I have effectively doubled the amount of clear lid petris I can have.


Edited by blackout (10/31/16 09:50 AM)


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Invisiblepablokabute
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Re: Using glass petri tops & bottoms as lids for deeper plastic plates. [Re: blackout]
    #23787827 - 10/31/16 08:47 AM (7 years, 2 months ago)

:billymaythumbup:


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InvisibleLocN9ne
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Re: Using glass petri tops & bottoms as lids for deeper plastic plates. [Re: pablokabute]
    #23787876 - 10/31/16 09:04 AM (7 years, 2 months ago)

That isn't "quite loose" that is a different size homie, but thats irrelevant... Did you really do all of this just to make those expensive ass glass petris into lids? Or did i miss a part?


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Re: Using glass petri tops & bottoms as lids for deeper plastic plates. [Re: LocN9ne]
    #23787988 - 10/31/16 09:43 AM (7 years, 2 months ago)

Quote:

LocN9ne said:
That isn't "quite loose" that is a different size homie



I can see how it looks like that, but its not. It is upside down so the lid is facing up and the base is in it. The photo was at a slight angle and the area in the 11 o clock area looks like there is a huge gap, but you are looking through the glass. Looking around 4 or 5 o clock mark shows the real gap. The plates are not centred, I pushed it into the 11 o clock side to close the gap there.

Better photo here, added to the first post


Quote:

LocN9ne said:
Did you really do all of this just to make those expensive ass glass petris into lids? Or did i miss a part?



It is to allow them be deeper so I can make no pour glass petris without the risk of them boiling over. It also effectively doubles up the amount of glass petris that I have, as you say they are expensive, so those who already have them might want to double up. I got 15 for $38 including shipping to the EU, a good while ago. I would buy extra clear PP low containers now if I was buying again, could not find any when I got my glass ones.


Edited by blackout (10/31/16 09:57 AM)


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Invisiblepablokabute
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Re: Using glass petri tops & bottoms as lids for deeper plastic plates. [Re: blackout]
    #23790221 - 11/01/16 12:14 AM (7 years, 2 months ago)

its a great idea in my book.

do you have some of that 'in action' pics?


do you seal the sides with maybe cut up cling wrap or something?


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--- https://www.shroomery.org/forums/showflat.php/Number/23378638/fpart/1/vc/1

'The second seal: “All CONTAMINATED things and events are unsatisfactory.”'



"I envy you. You North Americans are very lucky. You are fighting the most important fight of all - you live in THE HEART OF THE BEAST."

--Anonymous Guerilla, or is he..


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Offlineblackout
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Re: Using glass petri tops & bottoms as lids for deeper plastic plates. [Re: pablokabute]
    #23828840 - 11/13/16 11:49 AM (7 years, 2 months ago)

Quote:

pablokabute said:
do you have some of that 'in action' pics?


do you seal the sides with maybe cut up cling wrap or something?



sorry for the delay, I only got around to making some the other day

This is them with agar in them, nothing transferred into them yet





I wrapped that one in tinfoil while heat treating it. I usually put dishes in clear plastic bags, they are not heat rated and shrink and cling to the dish, I usually leave the bag on until using them. I then usually put in a new bag again or else just leave them as is.


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