Previous in Forum: Corderite in Ceramics for Electrical Fuses   Next in Forum: Gas Plant Resources: HYSYS and GPSA
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
10 comments
Rate Comments: Nested
shankar.n
Member

Join Date: Jul 2008
Posts: 5

Better Plaster of Paris

07/11/2008 6:35 AM

how to increase the strength & curing time of plaster of parise with alfa grade
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#1

Re: plaster of parise

07/11/2008 7:31 AM

Add cement dust?

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
Thornpile
Active Contributor

Join Date: Jul 2008
Location: Oslo
Posts: 18
Good Answers: 1
#2

Re: Better Plaster of Paris

07/12/2008 6:09 AM

I don't know if this works, as I have never tried it myself, but adding an acrylic primer (primer made for concrete, to make it bond better to the surface, hey'di makes them in Norway) is supposed to make plaster stronger. Another option is to mix in chopped strand fibreglass, or buy a plaster with chopped strand allready mixed in.

The curing time of plaster is dependent on temprature, so if you try to keep the room and the mix cold, the curing time will increase. However there are several types of plaster and if you contact a proper muolding/arts supplier, they should be able to help you find a type with your prefered setting time. If not, it could be an idea to try adding in a concrete retarder, although that is a wild guess, and will take some experimenting on your behalf.

Good luck

__________________
 I am the workshop king, I can make anything...
Register to Reply Score 1 for Good Answer
No more "Almost" Good Answers.
bwire
Guru
Popular Science - Weaponology - bwire Hobbies - Car Customizing - New Member

Join Date: Dec 2007
Location: Upper Mid-west USA
Posts: 7498
Good Answers: 97
#3
In reply to #2

Re: Better Plaster of Paris

07/12/2008 12:28 PM

Add "Elmer's Glue" to the mix

__________________
 If death came with a warning there would be a whole lot less of it.
Register to Reply Score 1 for Good Answer
Go to Next "Almost" Good Answer
Randall
Guru

Join Date: Aug 2005
Location: Hemel Hempstead, UK
Posts: 5826
Good Answers: 322
#4
In reply to #3

Re: Better Plaster of Paris

07/14/2008 3:31 AM

Which one: they appear to sell all sorts?

__________________
 If you spend all your time looking for people and things to complain about: trust me, you will find plenty to complain about.
Register to Reply
bwire
Guru
Popular Science - Weaponology - bwire Hobbies - Car Customizing - New Member

Join Date: Dec 2007
Location: Upper Mid-west USA
Posts: 7498
Good Answers: 97
#5
In reply to #4

Re: Better Plaster of Paris

07/14/2008 2:09 PM

The original type

is water soluble.

__________________
 If death came with a warning there would be a whole lot less of it.
Register to Reply
Randall
Guru

Join Date: Aug 2005
Location: Hemel Hempstead, UK
Posts: 5826
Good Answers: 322
#6
In reply to #5

Re: Better Plaster of Paris

07/15/2008 2:18 AM

That looks like a PVA glue: so in India Fevicol is probably the best known brand.

Shankar, What did you mean when you said: "with alfa grade"?

__________________
 If you spend all your time looking for people and things to complain about: trust me, you will find plenty to complain about.
Register to Reply
shankar.n
Member

Join Date: Jul 2008
Posts: 5
#7
In reply to #6

Re: Better Plaster of Paris

07/16/2008 12:07 AM

hai Randall,

Basicaly in india there are verious of grades of plaster of parise alfa,beta are well known grades used in cement,medical industries.i have only some datas on alfa grades and the combination of alfa depends as per customer's requirement.

i am addding the spec which i have with me fro your knowledge

Parameters

Specifications

Plaster of Paris Grade Alpha
Plaster : Water ratio 100 ; 50
Retention on 120 mesh 0.9%
Mixing, Soaking and blending time 5 Minutes
Initial setting time by Vicat apparatus 21 Minutes
Final setting time by Vicat apparatus 32 Minutes
Rise in Temperature 11 Deg C
Modulus of Rupture - Dry 82 K.Gms/sq.cm
Bulk Density 1.15Gms/cc

Regads

Shankar.n
Register to Reply
bwire
Guru
Popular Science - Weaponology - bwire Hobbies - Car Customizing - New Member

Join Date: Dec 2007
Location: Upper Mid-west USA
Posts: 7498
Good Answers: 97
#8
In reply to #7

Re: Better Plaster of Paris

07/18/2008 2:27 AM

Hello shankar.n:

I think I think you may use hemp fibers to strengthen plaster of paris.

To decrease set time you may add (experiment with this) calcium nitrate

as a catalyst.

__________________
 If death came with a warning there would be a whole lot less of it.
Register to Reply Score 1 for Good Answer
Go to Next "Almost" Good Answer
Randall
Guru

Join Date: Aug 2005
Location: Hemel Hempstead, UK
Posts: 5826
Good Answers: 322
#9

Re: Better Plaster of Paris

07/18/2008 4:26 AM

I suppose it depends on what you're trying to do: you might get some ideas from this other thread if you don't have to stick (no pun intended) with plaster of paris:-

http://cr4.globalspec.com/thread/23767/Material-for-a-good-Quality-toy-without-Lead

Polymorph plastic is used in medical applications.

Milliput as suggested by Thornpile looks good, but, would be expensive in large volumes.

__________________
 If you spend all your time looking for people and things to complain about: trust me, you will find plenty to complain about.
Register to Reply
bwire
Guru
Popular Science - Weaponology - bwire Hobbies - Car Customizing - New Member

Join Date: Dec 2007
Location: Upper Mid-west USA
Posts: 7498
Good Answers: 97
#10

Re: Better Plaster of Paris

07/18/2008 12:11 PM

Click on this link Enquiry

__________________
 If death came with a warning there would be a whole lot less of it.
Register to Reply
Register to Reply
Have a Different Question?
10 comments

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
Copy to Clipboard

Users who posted comments:

bwire (4); PWSlack (1); Randall (3); shankar.n (1); Thornpile (1)

Previous in Forum: Corderite in Ceramics for Electrical Fuses   Next in Forum: Gas Plant Resources: HYSYS and GPSA

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Chemical & Material Science:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (69 right now)
Show Members
Advertisement