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Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O. It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, blackboard/sidewalk chalk, and drywall. A massive fine-grained white or lightly tinted variety of gypsum, called alabaster, has been used for sculpture by many cultures including Ancient Egypt, Mesopotamia, Ancient Rome, the Byzantine Empire, and the Nottingham alabasters of Medieval England. Gypsum also crystallizes as translucent crystals of selenite. It forms as an evaporite mineral and as a hydration product of anhydrite.
The Mohs scale of mineral hardness defines gypsum as hardness value 2 based on scratch hardness comparison.
View More On Wikipedia.org
The Mohs scale of mineral hardness defines gypsum as hardness value 2 based on scratch hardness comparison.
View More On Wikipedia.org
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pink and Gray GYPSUM for info !!
Pure gypsum is white but impurities colour it grey brown or pink. Its Marl that gives the plaster the pink colour. Marl is a natural impurity in the rock. And it also gives workability to the plaster. Gypsum rock was formed when the sea water evaporated millions of years ago, which was then...- Diamond Pool Finishers
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- aus gypsum usa
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- Forum: Canada
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Using gypsum based adhesive..
maybe Alan jackson can shed some light on this.... So if using a gypsum adhesive onto an un primed or primed as this one was then can the moisture from the adhesive going into the substrate rise and then soften gypsum adhesive back up and knack them... We know that gypsum does not like...- DHTiling
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- adhesive aus gypsum tile adhesive usa
- Replies: 5
- Forum: Canada
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Gypsum screed in a wetroom?
I'm on a new house at the moment, 100m of 900x450 porcelain, onto a sand and cement screed. This is phase one, I haven't been asked to price for the bathrooms (Yet) For some reason, the rest of the house has a gypsum screed, including 3 of the 4 bathrooms. These are not that common over here...- tommyzooom
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- aus gypsum screed tanking usa waterproofing wetroom wetroom tiling
- Replies: 12
- Forum: Canada
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Norcross tile to gypsum
Don't know how many of you use norcross but they are about to launch their newest addition called tile to gypsum. It is a rapid setting adhesive specific or anhydrite and hemihydrate screeds. That's another on the list. I have a data sheet available which I will post when I work out how to.... -
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Gypsum based tile adhesive
I did a floor with GBTA (from Creative Impressions) a couple of months ago and took a few pics along the way and thought I'd share them with you all. A bit of background on this particular floor first. It was pumped in on April 22nd (2011) at a thickness of 50mm and left to dry for 3 months...- Ian
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- adhesive gypsum tile tile adhesive usa
- Replies: 10
- Forum: America
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tiling a sealed gypsum screed??? Advice needed
Hi all, I was looking at a friends not so new, new build this evening. He wants a decent amount of tiling done. The main job is on a sealed gypsum screed. The screed was put in and polished about a year ago. It is over a wet UFH system. They where advised to seal the screed with an water based...- davy_G
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- advice gypsum needed screed sealed tiling usa
- Replies: 28
- Forum: America
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Mortar or adhesive? pointing or grouting? - terracotta tiles on gypsum screed.
Hi again we were last in touch around Christmas last year about laying terracotta tiles on a gypsum screed. We established that we needed to install the GSHP and dry out the screed before tiling. UFH has been running since mid March and is now at 25 degrees C so conclude it should be dry...- piggy
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- adhesive grout grouting gypsum mortar screed terracotta tile tile adhesive tile grout tiles usa
- Replies: 12
- Forum: America
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Info on Weber.Col anhydrite 2 Gypsum based adhesive...
Hello all, some of you will know that I managed to get my hands on some of the Weber gypsum based adhesive last week (many thanks to Ajax123). Thought I would put up some info given to me by Weber as Im starting to see more and more anhydrite screeds and VERY few people seem to know how to work...- Rich
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- adhesive anhydrite anhydrite adhesive gypsum screed tile adhesive usa weber weber adhesive
- Replies: 26
- Forum: America
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Gypsum based tile adhesive.
hi, Got a job coming up anhydrite screed, Can someone recommend a gypsum based adhesive for it and where i can get it from im down in swansea i tried one local tile shop that sells benfer adhesive but they couldnt get hold of benfergyp. any advice much appreciated ted- Dumbo
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- adhesive gypsum tile tile adhesive usa
- Replies: 34
- Forum: America
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Where to buy gypsum?
Not really tiling related, but trying my luck here, looking to buy pure quality (hopefully sieved) gypsum, the good old fashioned flour consistency stuff, not plaster of paris or portland cement, but simply gypsum. Any ideas anyone? Thought it would be easy to google, how wrong I was... Thanks...- user123
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- gypsum usa where
- Replies: 18
- Forum: UK Tiling Forum
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Gypsum
Hi, I'm going to tile a bathroom, putting the tiles on bare plasterboard. When a product says use on gypsum, do they mean the plasterboard or the plaster (which often has gypsum written on it) or is it the same thing? I'm using Mapei Mapegum around the shower, but it says use Primer G...- dave_ave
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- gypsum usa
- Replies: 9
- Forum: UK Tiling Forum
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Gypsum Based Tile Adhesives
I don't expect this to be a usy thread but does anyone know of any Gypsum Based tile adhesives. There are quite a few in France Germany and Holland but not for some reason in the UK. I know of GBTA01 from creative impressions and Benfergyps available through Benfer stockists. Not...- Ajax123
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- adhesive adhesives gypsum tile tile adhesive tile adhesives usa
- Replies: 33
- Forum: UK Tiling Forum
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Ettringite formation over gypsum screed
Just updating a previous post that I made in February about using cement based adhesive over an anhydrite calcium sulphate (gypsum) screed with no primer. Took four months for the problem to develop but tiles are a write off and will all now have to be ripped up and replaced. Symptoms start...- ecopaddy
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- anhydrite adhesive gypsum over screed usa
- Replies: 33
- Forum: UK Tiling Forum
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Tiling on gypsum based floor screeds
Hi, I have 70sqm of floors tiles to lay in one house, ( I also have a further 50sqm floors and walls upstairs aswell!!)which are going to be laid onto gypsum based floor screeds, I was wanting to know if anyone had done any before and what materials were used e.g adhesive and primer and how...- yrag1964
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- floor floor tiling gypsum screed tiling usa
- Replies: 1
- Forum: UK Tiling Forum
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Cement based adhesive on calcium sulphate (gypsum) screed
Recently a job was completed for me and I'd like some advice if possible. Floor comprises of a poured anhydrite calcium sulphate (gypsum) screed. The tile adhesive use was BAL Rapidset Flexible adhesive and the adhesive was applied directly to the floor screed. Recommended primer such as BAL...- ecopaddy
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- adhesive anhydrite adhesive cement gypsum screed tile adhesive usa
- Replies: 12
- Forum: UK Tiling Forum
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gypsum and cement based adhesives
We all know that you should prime a plastered wall when using cement based adhesive to stop reaction...well as I was plastering a wall yesterday it got me thinking (yes painful, especially as I had a hangover), I had done an internal render of sand and cement and was going over it with...- devonmark
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- adhesive adhesives cement gypsum tile adhesive usa
- Replies: 13
- Forum: UK Tiling Forum
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