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membrane

A membrane is a selective barrier; it allows some things to pass through but stops others. Such things may be molecules, ions, or other small particles. Biological membranes include cell membranes (outer coverings of cells or organelles that allow passage of certain constituents); nuclear membranes, which cover a cell nucleus; and tissue membranes, such as mucosae and serosae. Synthetic membranes are made by humans for use in laboratories and industry (such as chemical plants).
This concept of a membrane has been known since the eighteenth century but was used little outside of the laboratory until the end of World War II. Drinking water supplies in Europe had been compromised by the war and membrane filters were used to test for water safety. However, due to the lack of reliability, slow operation, reduced selectivity and elevated costs, membranes were not widely exploited. The first use of membranes on a large scale was with micro-filtration and ultra-filtration technologies. Since the 1980s, these separation processes, along with electrodialysis, are employed in large plants and, today, several experienced companies serve the market.The degree of selectivity of a membrane depends on the membrane pore size. Depending on the pore size, they can be classified as microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO) membranes. Membranes can also be of various thickness, with homogeneous or heterogeneous structure. Membranes can be neutral or charged, and particle transport can be active or passive. The latter can be facilitated by pressure, concentration, chemical or electrical gradients of the membrane process. Membranes can be generally classified into synthetic membranes and biological membranes.

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  1. B

    Mapei Mapei WP200 waterproof decoupling membrane anybody else use it?

    Been using Mapei WP200 waterproof decoupling membrane for the last 3 wetrooms I’ve done. Must say it’s a really good product and recommend trying it. Easy to get hold of at CTD, 30 metre roll, corner/ transition tapes, internal/external corners available also. Anybody else use it and what is...
  2. Del W

    UK Opinions please on Heatbase decoupling membrane.

    Hello, compared to other systems this seems like a money saver. Anyone used it and have any feed back ? Thanks, Del.
  3. R

    Breaching damproof course? Ok or no or ways round it?

    A customer wants a low profile shower in a downstairs bathroom on a concrete floor. The drainage chanell required would need penetrate the dpc on the outside wall and so presumably that of the floor inside the house too. (I assume they should be on same level?) Drainage would travel about about...
  4. M

    UK Dural Durabase CI FH Decoupling UFH - Anyone used it.

    Hi All Snow day for me today so doing some research into a job thats coming up. It 30m2 with 12 m2 UFH. Till now I have always used pro warm backboards with UFH and a layer of SLC over the top but this seems to be going out of fashion and is rather costly. Been looking into UFH membranes and...
  5. Stevev

    tanking membrane...............

    What do you guys think of this? INSTALLATION GUIDE: Impey WaterGuard - https://phpionline.co.uk/installation-guides/installation-guide-impey-waterguard/
  6. Mapei UK Marketing

    Mapei MAPEI’S ANTI-FRACTURE MAPETEX MEMBRANE

    NOW FIX MAPETEX WITH ULTRALITE RAPID FLEX S1 Mapei’s Mapetex is a synthetic, non-woven fabric that may be used as an anti-fracture system together with Mapei’s Ultralite Rapid Flex S1 lightweight rapid setting deformable adhesive. Jason Brunt, Ceramic Product Manager at Mapei UK commented...
  7. Lakey

    Wetroom tray & UFH?!

    Evening folks I am about to tile a bathroom floor inc, Impey wetroom tray & UFH. The work up until now has been carried out by someone else and this is where its at. The floor at present is standard chipboard with the tray being approx 2-3mm proud. I need to run the loose lay cable UFH and...
  8. K

    Liquid membrane over formed tray

    Hi. I've bought the Impey formed tray. Looking at tanking kits, the Impey one (roll out membrane) would cost me about £450 while an alternative liquid kit, by Everbuild Aquaseal will cost me under £100. (15 sqm). Do I just treat the formed tray like any other floor when applying the liquid...
  9. M

    Exterior tiling over waterproof membrane - help please!

    Hi, we are in Gibraltar so there are a limited number of tilers available - I'd like to ask the experts on here for advice, so I know what to ask them to do please. We have exterior steps and balconies which are currently tiled. Beneath them are rooms - when it rains water comes through the...
  10. Chris Gibbs

    Anyone experienced static build up in their arm from spreading adhesive over uncoupling membrane

    Anyone experienced static build up in their arm from spreading adhesive over uncoupling membrane? Happened last week to me when it was hot laying durabase membrane... the steel spreader on the nylon matting created static. Kept me awake I suppose laying 100 meters of the stuff
  11. J

    Mapei Mapei WP 200 waterproofing and uncoupling membrane

    anyone tried it? Waterproof and uncoupling membrane my local CTD is selling it now. Special price for it at the moment of about £130 plus. Normal price £190 plus for a 30mt roll. http://www.mapei.com/public/COM/products/2199_mapeguard wp 200_gb.pdf
  12. F

    Uheat membrane and cable and tanking and moisture control...?

    Hello guys, quoting a "Bathroom", 20 square metre floor, partly set falls for linear waste and shower area, to contain self contained sauna and seperate hot tub, and 30 metre walls. Needs electric undertile heating, tanked for wetroom, and the screed is not yet laid, but will be using quick...
  13. S

    Preparation Wetroom floor, hardi backer already down, needs levelling, uncoupling membrane?

    Hi all, starting a wet room floor soon, have a few questions I would like some help with! The floor has already been installed by a builder and has Hardi backer boards down, running up to the tray, but will need levelling before reaching it. 1. Hardi backer is not waterproof, so how does self...
  14. S

    Uncoupling membrane vs no more ply, when & where?

    Hi everyone, newbie here, have had previous tiling experience and decided to give it another go, although this time self-employed. Have recently taken a crash course to scratch up on skills and give myself a better foundation of knowledge, cannot wait to get started. I’m still a little...
  15. L

    Decoupling membrane

    I am tiling a floor for first time on decoupling membrane ( durabase) is it best to lay the decoupling membrane on the whole floor even if I may not tile it all in the same day . Using anhyfix to lay the mat .
  16. G

    Decoupling membrane

    Just got on a job 46m2, I'm laying a decoupling membrane. Since the quote the customer has installed an island with granite worktop in middle of area. My question is do I run the membrane under the island units and through the other side in a continuous roll or do I stop just under and start...
  17. M

    S2 adhesive & membrane required?

    Hi all, 1st post so go easy on me... So my flat is on the first floor. I plan to rip up the old cracked tiles & old subfloor (not sure what it is), relay 18mm ply with noggins under any joints & screw every 150mm. Will then install "Dural DuraBase CI++ Crack Isolation/Decoupling Matting". Will...
  18. G

    Using raimondi on ditra matt

    hi all Just a general question. Is it posssible to use a tile level system such as raimondi etc on top of a decoupling membrane?
  19. Chris Gibbs

    Uncoupling membrane

    I've just had a scare that a tile had cracked on a 30m porcelain floor that i laid about a month ago... panic over, it was just something stuck to the surface (glue I think) anyway I then thought about it... would it be a nightmare removing a tile 600 x 600 from an uncoupling membrane (durabase)...
  20. B

    Water UFH Decoupling membrane needed?

    I have 2 rooms to tile with ceramic tiles 15 x 60 cm tiles. There is a sand and cement screed of about 90mm thick with ufh heating pipes set within. One room is approx 5x5 metres , the other joins this room and is a hall at 1.2 x 4 metres, there is an expansion joint between the 2. Would this...
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