Bit of gypsum history

Nisus

Elite Member
#1
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:

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

Marl - Wikipedia, the free encyclopedia
 

bubbles65

Private Member
#2
STICKY!!!!!!!!
:RpS_thumbsup: :RpS_thumbsup: :RpS_thumbsup: :RpS_thumbsup: :RpS_thumbsup: :RpS_thumbsup: :RpS_thumbsup: :RpS_thumbsup:
 

henry

Private Member
#4
What a great post right up my street.
 

Arti

Well-Known Member
#6
http://


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

Dropsalot

Private Member
#8
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
 

zombie

Private Member
#12
Wonder what happened to henry and bubbles65 both used to post regular!
 

essexandy

Private Member
#15
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.
 

Nicm

Well-Known Member
#21
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.
 

Arti

Well-Known Member
#26
I know mate 6 year old thread lol :D


Think I posted that after a trip down the mines lol :coffe:
Thought that was you burying claymonster in the gardening section. Remember when his lass was kicking off and Danny had to ban her  :risas::risas::risas::risas::risas:
@Nisus
 

JessThePlasterer

Well-Known Member
#28
Thought that was you burying claymonster in the gardening section. Remember when his lass was kicking off and Danny had to ban her  :risas::risas::risas::risas::risas:
@Nisus
Whaaaaat??!!! If Si came on here and got banned I’d die of shame! Lol!
 
#29
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:

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

Marl - Wikipedia, the free encyclopedia
and here endith the lesson ;very good