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Freeze drying, also known as lyophilisation or cryodesiccation, is a low temperature dehydration process that involves freezing the product, lowering pressure, then removing the ice by sublimation. This is in contrast to dehydration by most conventional methods that evaporate water using heat.Because of the low temperature used in processing, the quality of the rehydrated product is excellent. In case solid objects like strawberries are freeze dried the original shape of the product is maintained. If the product to be dried is a liquid, like often seen in pharmaceutical applications, the instant properties of the final product are optimized by the combination of excipients (i.e., inactive ingredients). Primary applications of freeze drying include biological (e.g., bacteria and yeasts), biomedical (e.g., surgical transplants), food processing (e.g., coffee) and preservation.

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  1. P

    Cutting on a fropen central heating pipe

    Hi, looking for advise about freezing a pipe on the central heating system. I’m adding a new radiator to the system in another room and thought that a good way would be to freeze the pipe where I need to take off and return to the other pipe. I will be using push fit joints. My question is if I...
  2. M

    Freeze Master 690E (110v)

    Afternoon, I have a virtually new one of these for sale, they are now £2,060.00 new direct from Freeze Master or Broughtons. This used Freeze Master 690E Pipe Freezer 110v is used for freezing pipes from 15mm up to 61mm (2" iron). It comes with 7 pairs of reducers 15, 22, 28, 35, 42, 49, 54mm...
  3. S

    can my underfloor heating freeze and break?

    Hi, I would appreciate your opinion on this. Our heat pump broke down while we were away and the temperature in the house dropped. A plumber came out to look over the house and check for damage. A couple of taps broke but we had turned off the water so no major problems that cant be fixed...
  4. moonlight

    Freeze Master Regasing

    Hi, does anybody know what gas is in the freeze master's pipe freezing units, mine could do with a check and a top up. My local aircon branch said they might be able to re-gas the unit if it contained a gas they had. Thanks in advance.
  5. W

    Pipe freeze machine - new toy!

    Been doing ok so I treated myself to a rothy pipe freeze machine. Up to 28mm - very impressed with the tests I've done in the yard at work. Does anyone use these, we always work on a per job rather than per hour basis and im amazed when I think of all the times I could have done with one and all...
  6. T

    rothenberger eco freeze stopped working

    Hi can anyone help my eco freezer not going lower than -4 tank is full and no air locks help is it dead
  7. C

    Freeze master or Rothenburg rofrost

    Hi all, Freeze master 280 or Rothenburg rofrost 28?? Which is the better and why?? I have read that the clamps with bungee straps on the freeze master can get into awkward spots but what's the reliability like on both? Figure if I'm going to be spending around £800 I may as well ask the people...
  8. W

    Freeze Master Machine 350D

    Freeze Master 350D machine. A bit hit and miss, hence the price - could do with servicing, or it's possible to send them to Freezemaster for complete overhaul. £200 including carriage.
  9. moonlight

    Freeze master servicing

    I think one of the arms on my Freeze master may be failing? It seems to take longer to freeze. Has anyone had theirs serviced and how much does it cost? Thanks in advance.
  10. Stanios

    Pipe Freezing

    Hi all, Just been to a job, ceised stopcock no outside isolation, I froze the pipe below stopcock took it off was going to put the new on old nut and olive but alas it didn't want to fit properly as olive was too far down. Only option was olive cutters at this point and I decided to just put...
  11. X

    Holding a 3 port valve

    Hi is it possible to hold a vaccum with bungs and change a 3 port valve, and it is 3 openings and I believe you can only have 2 openings, if not does anyone have any other solutions without draining down, or any other tips. thanks
  12. N

    Magnetic Filter Location

    Good morning all A quick question where do you install the mag filter on an external boiler installation? I know ideally it should be on the boiler return at its lowest point before the boiler. I am just a bit concerned about freezing etc. As I don't want it installed in the loft either which...
  13. P

    What's The Minimum Length Of Pipe I Need To Get A Freeze Kit On?

    Bit of a tricky one. The stop tap in pavement is very old and does nothing. Water co says 10 months to come out and replace!!! The stop tap inside the Victorian house is under an access panel in floor inside front door as the tap is in void under ground floor. The pipe from under garden is lead...
  14. N

    Need a pipe freeze

    A few on ebay but what are the robust brands. Just not sure about the rothenburger offering but could be persuaded (rofrost) Seen a few eco-freezes but they are rubbish right ???
  15. T

    Electric pipe freezer

    Honestly are they worth the money? I keep looking at them wondering if one will save me time. I always have a couple cans of freeze squirt on the van don't tend to use a great deal. Has anyone got one and its it of much use
  16. S

    Rothenberger Plumb Freeze Eco Pipe Freezing

    Well was not a happy chap yesterday. so I bought the above item months ago from a member on here. Now the first time i went to use it it would not get below -15 so would need freeze a 15mm pipe but i thought must of been running water ( in a hotel) My Saturday shift in middle of nowhere...
  17. M

    Condensate pipe

    I have a 32mm condensate pipe sticking out the wall for a combi. It comes out the wall about 1m from the ground. It then needs to turn left and travel 3m where it will join right at the bottom of a soil pipe through a strap on boss. My question is - can I put the 3m bit (as long as it is...
  18. S

    Freeze and Brazing pipework?

    Hi, is this possible to do? I'm trying to install a towel rad and need to move pipework, and i really want to avoid draining down the system at this time of year. Pipework is also microbore if that make any difference. I guess there are some ways to join plastic pipe to this but i didn't...
  19. M

    Can you freeze mdpe pipe?

    Hi, I have a 32mm mdpe pipe in a warehouse that I need to re-route. We can't shut the supply off so I wanted to freeze it to work on it. Is an electric pipe freezer likely to damage the pipe by making it too cold / brittle? Don't want to get halfway through the job and find it splits or cracks...
  20. P

    spider main

    on a dry rot/damp job, ripped the kitchen out today, the main stop tap and pipework is corroded quite bad, (ill add photo tomorrow) id like to swap the tap but can not find a external tap anywhere, I know its a spider main but cant find the tap, any ideas
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