Bit of gypsum history

[Nisus]

A bit of gypsum history.

As requested by Gibbo :RpS_thumbup:



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 hidden in the earths crust, until it was bought close to the earths surface during the last ice age.
It is now about 300feet below ground.

The grey plaster is mined in the north & pink plaster in the south, but it gets delivered all over the Uk and even to Poland. :-0

Also 95% of a bag of finish plaster is ground down gypsum rock & the other 5% is additives.
Backing plaster is 90% ground down gypsum rock & the other 10% is additives.

So every bag of plaster you use is roughly 180million year old rock. :-0
Something to think about next time your spreading the muck. :RpS_thumbup:

Couple of links to read quite interesting :RpS_biggrin:

https://www.civil.uwaterloo.ca/beg/CE265/Gypsum_intro.pdf

Marl - Wikipedia, the free encyclopedia

 

[bubbles65]

STICKY!!!!!!!!
:RpS_thumbsup: :RpS_thumbsup: :RpS_thumbsup: :RpS_thumbsup: :RpS_thumbsup: :RpS_thumbsup: :RpS_thumbsup: :RpS_thumbsup:

 

[Gibbo]

Yaaaawwwnnn

 

[henry]

What a great post right up my street.

 

[Nisus]

No probs Henry :RpS_biggrin:

 

[Arti]

https://

seen this on one of those Professor Brian cox programmes............:RpS_thumbup:

 

[daza1001]

180 million years old and my bag was out of date last week.
My luck.

 

[Dropsalot]

Soooooo........
If you used that volcanic water in bottles, you know......the stuff that fell as rain a billion years ago........and you used 180million year old rock..........that would be proper cool

 

[Danny]

180 million years old and my bag was out of date last week.
My luck.

Actually laughing at that

 

[lurpak]

Ok.

 

[Olican]

6 years ago...feels like yesterday

 

[zombie]

Wonder what happened to henry and bubbles65 both used to post regular!

 

[JessThePlasterer]

Didn’t know Henry but bubbles was cool

 

[JessThePlasterer]

This was interesting! Likey! Just bored Si to death reading out loud

 

[essexandy]

Wonder what happened to henry and bubbles65 both used to post regular!

I think a lot of the proper old school guys just couldn't take the place seriously once a girl was let in. Not like you and me, modern forward thinking liberals.

 

[Nisus]

6 years ago...feels like yesterday

I know mate 6 year old thread lol


Think I posted that after a trip down the mines lol

 

[Olican]

I know mate 6 year old thread lol


Think I posted that after a trip down the mines lol

Was that the one with Swarty and his transgender translator? God I miss swarty

 

[Nisus]

Was that the one with Swarty and his transgender translator? God I miss swarty

No lol I didn't go on that one

 

[Danny]

forum fever strikes....

TPF has broken marriages up over the years and all sorts

Wonder what happened to henry and bubbles65 both used to post regular!

 

[LarryTheDecorator]

I just did the same to the master and the dog, he walked off to get his brush to roll on and she got bored

This was interesting! Likey! Just bored Si to death reading out loud

 

[Nicm]

forum fever strikes....

TPF has broken marriages up over the years and all sorts

I’m not sure about that Danny,i’m on here a good bit and there’s not a sign of her going anywhere.

 

[JessThePlasterer]

I think a lot of the proper old school guys just couldn't take the place seriously once a girl was let in. Not like you and me, modern forward thinking liberals.

Stop ribbing @Vincey and his new work trousers!! He looks pretty and that’s the end of it!!

 

[essexandy]

Stop ribbing @Vincey and his new work trousers!! He looks pretty and that’s the end of it!!

Oh Butch you just blurted his name out, I'm more of a gentleman.

 

[JessThePlasterer]

Oh Butch you just blurted his name out, I'm more of a gentleman.

Pppffftttt!

Women plastering in painters n decorators colours! Whatever next!!!

 

[essexandy]

Pppffftttt!

Women plastering in painters n decorators colours! Whatever next!!!

Exactly!

 

[Arti]

I know mate 6 year old thread lol


Think I posted that after a trip down the mines lol

Thought that was you burying claymonster in the gardening section. Remember when his lass was kicking off and Danny had to ban her 
@Nisus

 

[Vincey]

I’m to busy rendering to worry about all these skimmers

 

[JessThePlasterer]

Thought that was you burying claymonster in the gardening section. Remember when his lass was kicking off and Danny had to ban her 
@Nisus

Whaaaaat??!!! If Si came on here and got banned I’d die of shame! Lol!

 

[The Hobo]

A bit of gypsum history.

As requested by Gibbo :RpS_thumbup:



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 hidden in the earths crust, until it was bought close to the earths surface during the last ice age.
It is now about 300feet below ground.

The grey plaster is mined in the north & pink plaster in the south, but it gets delivered all over the Uk and even to Poland. :-0

Also 95% of a bag of finish plaster is ground down gypsum rock & the other 5% is additives.
Backing plaster is 90% ground down gypsum rock & the other 10% is additives.

So every bag of plaster you use is roughly 180million year old rock. :-0
Something to think about next time your spreading the muck. :RpS_thumbup:

Couple of links to read quite interesting :RpS_biggrin:

https://www.civil.uwaterloo.ca/beg/CE265/Gypsum_intro.pdf

Marl - Wikipedia, the free encyclopedia

and here endith the lesson ;very good

 

[jamesthefirst]

Multi and board are sieved once, pure is sieved twice.