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Amazon Shop for: Gypsum, pH Test Strips

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Offlinecondonethis
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Gypsum Substitute?
    #4081377 - 04/21/05 03:30 PM (11 years, 7 months ago)

I was just wondering if anyone was aware of a substitute for gypsum, as it cannot be found locally, and I fear I will never pay the $9 to ship a $4 item? (good argument, ay?) My guess would be that since gypsum is a base that maybe a small amount of lime, but definitely not lye, would work.  Any response is greatly appreciated. I want to do this the right way the first time. Thanks.  :crazy:


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Invisibleshobimono
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Re: Gypsum Substitute? [Re: condonethis]
    #4081429 - 04/21/05 03:40 PM (11 years, 7 months ago)

Drywall is made of gypsum, so is blackboard chalk.


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InvisibleArp
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Re: Gypsum Substitute? [Re: condonethis]
    #4081441 - 04/21/05 03:41 PM (11 years, 7 months ago)

To keep the grains from sticking I reckon gypsum is what you should use as it doesnt dissolve with the water as lye but im only guessing, don't know realy :crazy:

I figure the gypsum works as a coating for the grains and that way prevents them from sticking.


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InvisiblePrisoner#1M
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Re: Gypsum Substitute? [Re: shobimono]
    #4081527 - 04/21/05 04:07 PM (11 years, 7 months ago)

Quote:

shobimono said:
Drywall is made of gypsum, so is blackboard chalk.




drywall is made from gypsum but chalk is not.

as arp mentioned it works well to help prevent grains from sticking and also
works as a buffer to resist changes in PH, it also seems to help in the prevention
of many bacterial contams


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Offlinecondonethis
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Re: Gypsum Substitute? [Re: Prisoner#1]
    #4081543 - 04/21/05 04:16 PM (11 years, 7 months ago)

Quote:

Prisoner#1 said:
drywall is made from gypsum but chalk is not.




So I could buy commercial drywall and treat it as if it were in fact gypsum, introducing it directly to the substrate? Or is there a purification process it would have to undergo?


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InvisiblePrisoner#1M
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Re: Gypsum Substitute? [Re: condonethis]
    #4081631 - 04/21/05 04:47 PM (11 years, 7 months ago)

Quote:

condonethis said:
Quote:

Prisoner#1 said:
drywall is made from gypsum but chalk is not.




So I could buy commercial drywall and treat it as if it were in fact gypsum, introducing it directly to the substrate? Or is there a purification process it would have to undergo?




commercial drywall is made from gypsum, if you hit a home improvement
store you can probably get a good size piece of scrap for free, buying a 4'x8'
sheet would run about $5 and that could last you a lifetime, just scrape it
along the edge with a piece of metal like the back of a knife, if you want it
finer then place that dust in a food processor, it will work as it is


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Offlinecondonethis
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Re: Gypsum Substitute? [Re: Prisoner#1]
    #4082668 - 04/21/05 09:13 PM (11 years, 7 months ago)

Thanks!


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Invisibleshobimono
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Re: Gypsum Substitute? [Re: Prisoner#1]
    #4083575 - 04/22/05 02:04 AM (11 years, 7 months ago)

Quote:

Prisoner#1 said:
Quote:

shobimono said:
Drywall is made of gypsum, so is blackboard chalk.




drywall is made from gypsum but chalk is not.





Do you have a source that says blackboard chalk is not gypsum? If you notice, I did say "blackboard chalk" and not "chalk", they are two different things.

These people sure think blackboard chalk is gypsum.

http://encyclopedia.laborlawtalk.com/Chalk

"Blackboard chalk is a substance used for drawing on rough surfaces, as it readily crumbles leaving particles that stick loosely to these surfaces. Blackboard chalk, often supplied in sticks about 5 cm long, is not actually made from the mineral chalk but from gypsum (calcium sulfate)."

Here people down in Zambia mine it and they say blackboard chalk is gypsum.

http://66.102.7.104/search?q=cache:zWjwv...chalk&hl=en


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Amazon Shop for: Gypsum, pH Test Strips

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