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TIS87
Stranger

Registered: 11/22/19
Posts: 123
Last seen: 10 months, 1 day
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Re: Making deli plates. Please tell me where I goofed. [Re: sandman420]
#26454573 - 01/27/20 06:21 AM (4 years, 2 days ago) |
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I really like my 4oz ball jars with plastic lids, no mods needed.
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Antitemplar
Stranger

Registered: 10/02/19
Posts: 29
Last seen: 3 years, 7 months
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Re: Making deli plates. Please tell me where I goofed. [Re: Mr. Alien]
#26456344 - 01/28/20 07:00 AM (4 years, 1 day ago) |
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Quote:
Mr. Alien said:
Quote:
Antitemplar said:
Photo: 
Maybe they are indeed pp5 but without a GE hole they will warp regardless. These one probably warped because of the lack of GE hole.
The holy grail petris on my signature don't need GE hole and won't warp either. I fully recommend them.
I have 1/4” double micropore holes under the lids on the side.
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Antitemplar
Stranger

Registered: 10/02/19
Posts: 29
Last seen: 3 years, 7 months
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Re: Making deli plates. Please tell me where I goofed. [Re: Antitemplar]
#26456345 - 01/28/20 07:02 AM (4 years, 1 day ago) |
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Quote:
Tattersail said: I just cover the tops with foil rather than wrap the whole thing, and I leave it on until Im using them.
I have a piece of a "cupcake tier" that does the job for weighing down the bottom layer and I can put more tubs on the top. A wire rack of some kind would work if you can find one that fits your PC.

The condensation can be a pain but it usually clears up eventually.
This is helpful. Thanks!
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sandman420
Saint PP



Registered: 06/17/04
Posts: 5,384
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Re: Making deli plates. Please tell me where I goofed. [Re: Antitemplar]
#26456347 - 01/28/20 07:04 AM (4 years, 1 day ago) |
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it's just from the weight then. Those cups are very thin and get soft when warm. The cups tattersail has are much thicker than yours and can take the stacking.
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Antitemplar
Stranger

Registered: 10/02/19
Posts: 29
Last seen: 3 years, 7 months
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Re: Making deli plates. Please tell me where I goofed. [Re: sandman420]
#26456351 - 01/28/20 07:06 AM (4 years, 1 day ago) |
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Quote:
sandman420 said: When PP is hot it can warp because it is a thermoplastic. These thin deli cups will warp if anything is on top of it during the pc cycle so only one layer. It will also warp during cool down if the cups do not have a GE hole on the lid because the hot agar will pull a vacuum inside the cups as it cools and it will suck the cups in if the lid is airtight. It looks like you had one or both of these happen.
If you want better heavy duty deli cups look for Karat brand injection molded deli cups they are the only heavy duty ones that actually have PP lids I have been able to find. They are much thicker and can take stacking at least one layer.
Thanks I’ll check these out when I need more. I’ve gotten enough clarity I think they’re worth giving another shot. I have more PC trays coming today so i shouldn’t need to put something on them in order to have a proper water level.
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