Paraloid B-72

 (en.wikipedia.org)

65 points | by Ariarule 2 days ago

5 comments

  • zdw 1 hour ago
    This is the most esoteric post I've seen on HN in a while.

    How many museum curators who need non-yellowing flexible thermoplastic are there on here?

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    • boppo1 1 hour ago
      Oil painter here, this is news to me and if it doesn't dissolve in gamsol this is EXACTLY what I've been looking for for about 2 years.
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      • card_zero 44 minutes ago
        I followed the link to flexographic ink, and now I'm wondering whether boutique fine art flexography could or should exist. Like lithography, but more plastic.
    • CarVac 12 minutes ago
      I've done some DIY piano maintenance and I saw what was presumably this available to firm up the hammers. My piano needs them softened, though.
    • kazin1870 1 hour ago
      I use paraloid all the time, a bit surprised to see it posted here but I’ll support it.
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      • boppo1 58 minutes ago
        I'm new to it and having trouble finding guides:

        - how do I apply it as a coating? I want it to be ~ 1/6" to 1/8" thick and as hard as possible

        - will turpentine dissolve or soften it?

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        • chromacity 40 minutes ago
          It's a relatively soft plastic and I don't think you can realistically build a uniform, good-looking layer that's 1/8" thick, if that's what you mean. If you need that thickness, high hardness, and nice appearance, I think your best bet is just a sheet of glass or acrylic on top.

          It can be used as protective varnish, but that would be a very thin layer, probably 0.1 mm or something like that.

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          • boppo1 18 minutes ago
            Does it not level from gravity like other resins?
        • halestock 47 minutes ago
          I found a couple:

          https://resources.culturalheritage.org/osg-postprints/wp-con...

          https://www.zoicpaleotech.com/pages/paraloid-b72-in-fossil-p...

          acetone will dissolve it, dunno about turpentine.

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          • boppo1 18 minutes ago
            I'm reading that turp does not dissolve it, which is ideal so I can mix paint on top of it.
    • colordrops 52 minutes ago
      They should make non-yellowing transparent phone cases out of this stuff.
  • CarVac 14 minutes ago
    Heh, I upvoted this a few days ago and it must've gotten on the second-chance queue.

    Links to obsure but interesting Wikipedia articles are some of my favorite HN posts.

  • aidenn0 29 minutes ago
    How does its strength compare to MMA structural adhesives? What materials is it compatible with?
  • 0xbadcafebee 1 hour ago
    Huh. So it's a stronger, harder, less brittle, clear wood glue you can dissolve with acetone. Neat!
  • FpUser 1 hour ago
    Am I the only one that read it as Polaroid ;) ?
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