Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,283   Posts: 1,534,959   Online: 943
      
Page 1 of 2 12 LastLast
Results 1 to 10 of 18
  1. #1
    olleorama's Avatar
    Join Date
    May 2009
    Shooter
    Multi Format
    Posts
    526
    Images
    5

    chemical resistance

    How would the following materials/coatings resist the corrosiveness of photo chemicals?

    Urethane alkyd?

    Polyester?

    Epoxy resins?

    Which would be have the best resistance?

  2. #2

    Join Date
    Feb 2008
    Location
    Winnipeg, Canada
    Shooter
    Multi Format
    Posts
    1,301
    What are you coating and what type of finish do you want? Are you looking for resistance to working solutions, or to concentrated solutions of NaOH. Epoxies are the most durable and the easiest to DIY by brush if you aren't too concerned about the look of the final finish.

  3. #3
    olleorama's Avatar
    Join Date
    May 2009
    Shooter
    Multi Format
    Posts
    526
    Images
    5
    Quote Originally Posted by Bob-D659 View Post
    What are you coating and what type of finish do you want? Are you looking for resistance to working solutions, or to concentrated solutions of NaOH. Epoxies are the most durable and the easiest to DIY by brush if you aren't too concerned about the look of the final finish.
    Working solutions, B&W print chemistry.

  4. #4

    Join Date
    Feb 2008
    Location
    Winnipeg, Canada
    Shooter
    Multi Format
    Posts
    1,301
    Ok, what are you coating, glass, copper, brass, 302L, 316 or 1010 steel?

  5. #5
    olleorama's Avatar
    Join Date
    May 2009
    Shooter
    Multi Format
    Posts
    526
    Images
    5
    Quote Originally Posted by Bob-D659 View Post
    Ok, what are you coating, glass, copper, brass, 302L, 316 or 1010 steel?
    Whatever will turn out to be cheapest. I may even go so low as particle board.

  6. #6
    David Brown's Avatar
    Join Date
    Feb 2004
    Location
    near Dallas, TX USA
    Shooter
    Medium Format
    Posts
    3,283
    Images
    5
    You must be building a sink. DO NOT use particle board. or MDF. You will be sorry later.

  7. #7
    olleorama's Avatar
    Join Date
    May 2009
    Shooter
    Multi Format
    Posts
    526
    Images
    5
    Quote Originally Posted by David Brown View Post
    You must be building a sink. DO NOT use particle board. or MDF. You will be sorry later.
    Hmm, even if I coat the whole area (and the cuts) with polyester or epoxy? Would seem as it could be treated as being made from plastic if it were coated that way. I've seen wooden ships made from plywood coated in polyester and they seem quite fine after decades in marine environments. Although photo chemicals is probably a lot more corrosive than ocean water.

    Personal experience?

    I'm not really planning anything, just thinking in budget restricted ways. Second hand SS sinks and the likes are not really viable this time, unfortunately.

  8. #8
    Ian Grant's Avatar
    Join Date
    Aug 2004
    Location
    West Midlands, UK, and Turkey
    Shooter
    Multi Format
    Posts
    16,242
    Images
    148
    Of course wood can be fully treated and made waterproof and coated, MDF should work perfectly but marine ply is possibly better. There are books and articles on how to do it.

    Personally I'd line a wooden sink with thin PVC sheet and weld or solvent cement it's seams, I made a lot of things that way in the past.

    Ian

  9. #9
    David Brown's Avatar
    Join Date
    Feb 2004
    Location
    near Dallas, TX USA
    Shooter
    Medium Format
    Posts
    3,283
    Images
    5
    Quote Originally Posted by olleorama View Post
    I've seen wooden ships made from plywood coated in polyester and they seem quite fine after decades in marine environments. Although photo chemicals is probably a lot more corrosive than ocean water.

    Personal experience?
    Yes. Although not with a sink, but other applications. There is plywood made for outdoor and marine purposes. Wood in boats and ships is specially treated, etc. Particle board and MDF are not and will disintegrate if it gets wet. It will fail. I am not disputing that it could probably be coated with enough plastic or other material to make it initially water proof, but if the protection gets a break in it, and the particle board does get moisture, it will swell up and begin to come apart. By the time one puts enough effort and expense into making a water proof wooden sink (or boat), it would not be much more expense to simply use a proper wood substrate in the first place. Just my opinion, of course ...

  10. #10
    Ian Grant's Avatar
    Join Date
    Aug 2004
    Location
    West Midlands, UK, and Turkey
    Shooter
    Multi Format
    Posts
    16,242
    Images
    148
    David, MDF is treated unlike chip board (particle board) so has very significantly better water resistance which is major a reason for it's popularity.

    Ian

Page 1 of 2 12 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin