Bonding perspex/acrylic

Discussion in 'Anything DIY related' started by DesertConvert, Feb 5, 2013.

  1. DesertConvert

    DesertConvert Toad

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    I want to build a small box for my tank, out of perspex. I would like to "weld" the pieces together using some or other solvent. Someone suggested chloroform today, though I can't imagine that to be easily obtainable.

    Has anyone else done this before? And what did you use?

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  3. Aqii

    Aqii

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    Hi Martin, Chloroform (acetic acid and ethylene dichloride) can be used to "solvent weld". Solvents welds are not popular because they are difficult to work with, there is no gap filling and the bond is not as strong. Maizey's in PTA sells Tensol which i've never used but cant imagine its particularly difficult if you follow instructions.
     
  4. OP
    DesertConvert

    DesertConvert Toad

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    Thanks. I bought a can of Tensol(glorified superglue) but that didn't work for me. It's a mission to clamp the perspex in a manner that will result in a strong bond. Maybe I must give it another shot. The solvent bond appeared to be the better option.

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  5. Aqii

    Aqii

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    Hi Martin, Depending on the type Tensol can be one of two things 1) Acrylic Perspex polymer, PMMA, dissolved in a solvent or 2) Perspex polymer dissolved in the monomer,mma . You should be using the first type but ask the Sales rep (and ask the Sales rep what PMMA , polymerised methyl methacrylate, is too see if he knows what hes talking about) for the best solution from Tensol. Good joints in acrylic are all about good fit. You should not have to clamp pieces together. In fact doing so could reduce the strength of the joint as you are introducing stresses in the joint which the bond now has to resist.
     
  6. OP
    DesertConvert

    DesertConvert Toad

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    uploadfromtaptalk1360085952654.jpg

    I'm guessing this is the Methyl Methacrylate version, and not the PMMA version?

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    uploadfromtaptalk1360085952654.jpg
     
  7. Aqii

    Aqii

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    Hi Martin, so this is where the product rep comes in dichloromethane is a solvent for PMMA, however...does the label say methyl methacrylate (inhibited)?
     
  8. Aqii

    Aqii

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    If this contains inhibited MMA then it is most likely you need to use with a catalyst. Either a "PART B" or for more specialized products a specific type of light (narrow band 400nm)
     
  9. OP
    DesertConvert

    DesertConvert Toad

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    Yes, it does say (inhibited) on the label. What would the catalyst be? Also a fluid, or maybe a powder?

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  10. Aqii

    Aqii

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    it would be a liquid
     
  11. OP
    DesertConvert

    DesertConvert Toad

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    I'll give Maizeys a call tomorrow... Hear what they have to say. Thanks for all you input so far!

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  12. Aqii

    Aqii

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    Cool, as i said never worked with Tensol before so would also like to hear why it wasn't working for you.
     
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    DesertConvert

    DesertConvert Toad

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    I think it has more to do with impatience than anything else :)

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  14. karele

    karele

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    The tensol I helped someone bond sheets together was tensol 70 and this was 2 part if I recall correctly and there was also a cure time.


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  15. OP
    DesertConvert

    DesertConvert Toad

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    OK, so I finally got around to gluing the perspex together. The Tensol I have worked fine on its own. I didn't need any additional components. My mistake on the initial attempt was to use a brush(as per the instructions of the mamparra at Maizeys) to apply the Tensol. This time round I just used a small syringe to squirt the liquid along the joining line. I was a bit messy, but then again I didn't try to keep it clean. Just wanted to get it done! I let it cure for about 24 hours. I sealed the corners with marine silicone yesterday to ensure it's water tight.
     

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