Humidity Control: DIY Salt Packs

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pedant
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Sun Nov 01, 2020 1:52 am

lately, my favorite salt pack container is the 4 fl oz (120 mL) mason jar:

Salt Pack: tiny 120mL jar
Salt Pack: tiny 120mL jar
salt-pack-120mL-jar.jpg (71.78 KiB) Viewed 947 times

they can be obtained from amazon for about 1 usd each. i bough a box of 40 of them, and it came out to 0.80 usd/ea.

also, i'm out of puerh storage space. oh no!
i had to get creative and use an old pressure cooker for this tong:

Pressure Cooker Storage (open)
Pressure Cooker Storage (open)
pressure-cooker-puerh-storage-1.jpg (72.9 KiB) Viewed 947 times
Pressure Cooker Storage (closed)
Pressure Cooker Storage (closed)
pressure-cooker-puerh-storage-2.jpg (117.98 KiB) Viewed 947 times
m2193
Posts: 17
Joined: Sat Jan 23, 2021 10:31 pm
Location: East Coast, USA

Sat Apr 03, 2021 4:22 pm

Does any part of the ratio have to be adjusted if I use iodized table salt instead? My school has salt packs that are iodized salt, and the ingredients list salt, sodium silicoaluminate, calcium sulfate, detrose, and potassium iodide. I would assume the additions are minimally concentrated though.
AndieB
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Joined: Sun Apr 25, 2021 12:00 pm
Location: Monterey, CA

Sun Apr 25, 2021 12:07 pm

I am testing my salt pack made as described in a gallon size Ziploc bag with the hygrometer, but for the last 12 hours it is between 80-85%. My temperature averaged 70F. Is it possible I'm having a pressure difference at sea level in California? Just wondering why my reading is so off from 70%...
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pedant
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Sun Apr 25, 2021 5:59 pm

m2193 wrote:
Sat Apr 03, 2021 4:22 pm
Does any part of the ratio have to be adjusted if I use iodized table salt instead? My school has salt packs that are iodized salt, and the ingredients list salt, sodium silicoaluminate, calcium sulfate, detrose, and potassium iodide. I would assume the additions are minimally concentrated though.
it shouldn't matter, but i prefer to use pure NaCl since it's already cheap. pickling salt that comes in a plastic bag is my current recommendation. it seems to be less smelly than the stuff that comes in cardboard containers.
AndieB wrote:
Sun Apr 25, 2021 12:07 pm
I am testing my salt pack made as described in a gallon size Ziploc bag with the hygrometer, but for the last 12 hours it is between 80-85%. My temperature averaged 70F. Is it possible I'm having a pressure difference at sea level in California? Just wondering why my reading is so off from 70%...
have you calibrated your hygrometer?
AndieB
Posts: 3
Joined: Sun Apr 25, 2021 12:00 pm
Location: Monterey, CA

Sat May 01, 2021 3:03 pm

pedant wrote:
Sun Apr 25, 2021 5:59 pm
have you calibrated your hygrometer?
For the brand new Govee hygrometers I'm using, their website says this:
"The device has been calibrated by precision instrument already. Normally it does not need to be calibrated again."

However, I am doing a calibration test with all 3 new hygrometers with a teaspoon of moistened salt in a gallon size ziploc. After 6 ours if each one does not read 75, I will adjust them. Thanks for pointing me in the right direction. My first experiment using hygrometers :geek:
Last edited by AndieB on Sat May 01, 2021 3:42 pm, edited 1 time in total.
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pedant
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Sat May 01, 2021 3:37 pm

AndieB wrote:
Sat May 01, 2021 3:03 pm
pedant wrote:
Sun Apr 25, 2021 5:59 pm
have you calibrated your hygrometer?
For the brand new Govee I'm using, their website says this about the hygrometer:
"The device has been calibrated by precision instrument already. Normally it does not need to be calibrated again."
even so, in my mind, the most plausible explanation is your hygrometer is out of cal.
therefore, i suggest calibrating it.

NaCl alone (without sucrose) gives ~75% RH:



see also:

viewtopic.php?p=25906#p25906
viewtopic.php?p=25992#p25992
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