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Paraloid B-72

103 points

by Ariarule

3 days ago

| past

| 6 comments

| en.wikipedia.org

| HN

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zdw

2 hours ago

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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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aejm

19 minutes ago

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This post has exactly zero relevance to my professional career or personal projects, and this is exactly the type of esoteric content I love about HN!

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boppo1

2 hours ago

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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

2 hours ago

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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.

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kazin1870

2 hours ago

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I use paraloid all the time, a bit surprised to see it posted here but I’ll support it.

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boppo1

2 hours ago

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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

1 hour ago

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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

1 hour ago

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Does it not level from gravity like other resins?

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halestock

2 hours ago

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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

1 hour ago

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I'm reading that turp does not dissolve it, which is ideal so I can mix paint on top of it.

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CarVac

1 hour ago

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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.

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colordrops

2 hours ago

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They should make non-yellowing transparent phone cases out of this stuff.

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CarVac

1 hour ago

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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.

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Xmd5a

50 minutes ago

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Could this be used to 3D print supports ? For now, the only thermoplastic I know of that can be used to this effect is HIPS in conjunction with d-limonene.

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0xbadcafebee

2 hours ago

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Huh. So it's a stronger, harder, less brittle, clear wood glue you can dissolve with acetone. Neat!

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aidenn0

1 hour ago

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How does its strength compare to MMA structural adhesives? What materials is it compatible with?

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FpUser