cracking

In petrochemistry, petroleum geology and organic chemistry, cracking is the process whereby complex organic molecules such as kerogens or long-chain hydrocarbons are broken down into simpler molecules such as light hydrocarbons, by the breaking of carbon-carbon bonds in the precursors. The rate of cracking and the end products are strongly dependent on the temperature and presence of catalysts. Cracking is the breakdown of a large alkane into smaller, more useful alkenes. Simply put, hydrocarbon cracking is the process of breaking a long chain of hydrocarbons into short ones. This process requires high temperatures.More loosely, outside the field of petroleum chemistry, the term "cracking" is used to describe any type of splitting of molecules under the influence of heat, catalysts and solvents, such as in processes of destructive distillation or pyrolysis.
Fluid catalytic cracking produces a high yield of petrol and LPG, while hydrocracking is a major source of jet fuel, diesel fuel, naphtha, and again yields LPG.

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  1. M

    Cracked tiles on suspended floor

    Hi Our first floor bathroom floor is constructed of floor boards over joists over which I have laid an electric heat mat and covered with ceramic tiles. The floor has settled and cracks are beginning to appear in some of the tiles. Could I put a self levelling compound over the floor and...
  2. R

    Ditra matting and tiles cracking a year later

    We had tile installed in January of 2018. The installer put Ditra down. The grout stated to crack and come out a few months after installation. Other tiles move. Is this caused by the Ditra? Or some other reason?
  3. M

    Cracking grout along tub workaround?

    I tiled my sister's shower with subway tile but due to movement in the floor underneath the grout all crumbles were the tile meets the tub. I spent quite a bit of time trying to brace up the floor and walls and she's had people in there before to Jack up the house and brace everything. At...
  4. T

    Tiling on a small subsidence crack

    I have been to quote a job today, 35m2 in a kitchen, but they have a slight diagonal crack in the floor which I believe to be a subsidence crack, is there anyway to get around this or stay away from the job? Cheera
  5. Adrian mcc

    Adhesive for anticrack matting

    hi all, I have never used an anti crack matting before but hav asked the customer to use one as I’m tiling over underfloor heating overlay boards, I have primed in prim grip from tile master. He has bought this orange matting looks like schluter but think it’s a copy I was just wondering what’s...
  6. S

    Cracked Tiles

    Hi looking for advise regarding cracked wall tiles on an internal wall. I had a new bathroom installed with the bathroom being fully tiled. A few months after work finished I noticed cracked tiles at the window. The company came out to inspect the tiles and said they had never saw anything...
  7. M

    Help with cracked crumbling grouting

    Hi there, I wonder if you can help. I have some porcelain tiles and I believe there is a little movement which means that the grout is cracked and has come out - see pics. (I've tried three tilers and always had bad outcomes). So now the floor always looks dirty and I'm also extremely worried...
  8. E

    Cracked Tiles over Bonding Plaster

    Hi all, We had our bathroom fully re-done approx 2 months ago. 1880's property, the previous tiles around the shower area had failed, due to water ingress. All tiles, old plasterboard etc were removed. The two brick walls were then bonding plastered. The side of the chimney breast was built out...
  9. B

    Wall tiles cracking in a line

    Hi, I'm not sure if this is the right place to post but I'm hoping for some advice. About 2 months ago we had our bathroom redone and all was fine until last night when a line of 4 tiles spontaneously cracked over a period of 20 minutes while my son was having a bath. The line runs from the...
  10. W

    Commissioning UFH, cracked screed, large tiles, help

    Hello. I'd appreciate it if you guys could help me out here; I've been reading as many threads as I could on the matter over the last few days here and while I think I have a fair understanding of things, I'd like to provide the specifics of my situation. I have a 68 sqm apartment in which UFH...
  11. P

    Help please, tiles cracked/moving

    Hi everyone, I’m looking for a bit of help please. My house was a new build 18 months ago and we paid the builder extra to tile the first and second floors with polished 600x600 porcelain tiles as our previous house had these on the full ground floor with no issues whatsoever. All was okay for...
  12. J

    Tiles cracking On conservatory floor

    i have a conservatory floor which is 33 sq mts in a L shape It had a level screed over the pipes and was. very flat as laid with a laser, backed up by tiler who said it was within 1mm all over. I used a proffesional tiler and was laid with mapei? Both tile and grout cement. The floor was laid...
  13. K

    Badly cracked limestone - can I replace individually with decoupling

    self build completed 10 years ago, large kitchen diner on 65mm hand mixed screed, with no stress relief joints & wet UFH! Tiled with limestone, found that the tilers switched to cheaper adhesive not suitable for UFH approx a third of the way through the job, they then added flex fluid to the...
  14. D

    How to prevent tiles cracking

    Hi guys, I'm just after a bit of advice please. Basically we are splitting a bedroom into a ensuite and bathroom. We will be taking existing plaster off and going back to brick and either half or fully tiling. At a later date we will be having an extension directly below the room and having a...
  15. T

    After a long day, i go home and crack open a bottle of........

    SHOW US YOUR TIPPLE! Fancied this today:
  16. D

    Porcelain Tiles come away from Adhesive after 7 years

    Hey guys, first time poster so be kind! I had some porcelain tiles fitted in 2012, in the conservatory with underfloor heating. The same tiles have been laid throughout the ground floor of the property. Recently, myself and my wife noticed a hollow sound when our daughter threw a tennis ball...
  17. J

    Tiles cracked in new bathroom

    Hi, I was hoping I might get some advice with a cracked tiling issue I am experiencing. We had a new bathroom installed about a year ago, and noticed the other day that half the top two rows of tiles along an interior brick wall are cracked. We had a closer look around the bathroom, and found...
  18. H

    Hairline cracks in tiles

    I would just like to see if anyone could give me any advice on why this may be happening with tiles I installed a year ago I installed a bathroom with ceramic tiles which the customer decided on. I have had a nightmare with them as people ever since on the most annoying little things which I've...
  19. A

    Cracking Grout, advice needed

    could someone advise? I’ve recently had my bathroom floor tiles with ceramic tiles and in advance of my ruler fitting them we boarded the floorboards with 9mm ply. Since the tiler installed the tiles the grout has started to crumble and fall out! The ply seemed solid and no one walked on the...
  20. D

    Tiles coming up, cracks, and hollow points

    I recently had my whole ground floor tiled as part of a larger renovation project. On moving back in I noticed a tile with a crack in it which the contractor said would be replaced. Over the course of the next two months, a few more tiles developed cracks in them and a few lifted off the floor...
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