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TheShroomHermit t1_j04xgcj wrote

I've been cited for excessive glue knowledge. Anyway, the Plastic to Plastic doesn't even mention the difficulties of gluing Polypropylene (PP) to itself. You'll be stuck looking up Amazon reviews to confirm what works and what doesn't

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Fuegodeth t1_j053h6j wrote

Glue of the month hasn't been updated since 2003. I know how to glue Expanded Polypropylene (EPP) to itself. Use E6000, which used to be called GOOP. It's a room temperature vulcanizing rubber cement that adheres well and will stay flexible once set. Also, 3M90 spray adhesive works well on EPP if you have a large contact area to deal with.

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beanmosheen t1_j06oms3 wrote

E6000 is the answer to a lot of jobs. Stuff is magic.

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dayglo_nightlight t1_j07ms1v wrote

And it's cheap and readily available, which is awesome. Not to sound like a shill, I've just repaired an ipad case with it recently and I'm very impressed.

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beanmosheen t1_j07nugz wrote

It really is fantastic for a lot of use cases. Superglue and epoxy are also mainstays, but they tend to be brittle. All have their place.

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dayglo_nightlight t1_j07or0e wrote

Yeah, the shear strength of super glue just isn't great if you're trying to fix things (like the hinge flap of iPad case) that gets repetitive use. However, scoring/sanding + super glue THEN epoxy or cement can help when joining smooth surfaces together. Also it's great for holding shit together while you wait for the other glue to cure

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iamobiwan t1_j05ncu9 wrote

Yeah that was my first thought too. Former mechanical engineer. Immediately thought back to all the headaches trying to fix broken prototypes and thought this would be amazing if it had cross compatibility for PP, PE, nylon, ABS, silicone.

Still a cool concept. And if you’re in the plastics world you probably know enough through experience. But some hobbyists are going to run into some trouble treating all plastic the same lol.

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Typhon_ragewind t1_j07fqjz wrote

As a hobbiyst, my last resort is usually Araldite (epoxy based 2 component glue). Hasn't failed me yet

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HylianEngineer t1_j0535hd wrote

Oof, I feel this, i once spent several hours googling how to glue neoprene to... some other kind of plastic I don't recall at the moment. I never found the answer but my first try (epoxy) did work.

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howmanydads t1_j06p7j1 wrote

When I need to glue difficult plastics, or anything else unusual, I'll start by browsing through the McMaster adhesives section. They have filters for materials – including HDPE, polystyrene, PTFE – so it's easy to find a glue that should work. They list brand and model # so I'll track down spec sheets or instructions from the manufacturer, or see if someone's put up a review on YouTube.

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ohyeaoksure t1_j07k3bf wrote

Yeah this site isn't great. Project Farm on Youtube did a great video about gluing ceramics with epoxy. at one point in the video he thinks he's got a glue failure, turns out the tile broke but the epoxy held.

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dandandandan t1_j05ilym wrote

How would you glue nylon to nylon? We were making 2 part nylon handles for a hand held probe, where one part fit inside the other. Couldn't get anything to work, tried super glue, epoxy, some special 3m glue I can't remember the name of that the machining shop recommended... None of it held up in the field.

Ended up drilling and pinning them.

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Artootietoo t1_j06fwvq wrote

I would try e6000. I've used it to glue nylon to steel and whatever's on the back of a mirror. It's pretty goopy; you probably need a groove/recess so it doesn't squish out.

The parts I've used it on were 3d printed, so they had a slight texture which probably helped.

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dayglo_nightlight t1_j07ozkc wrote

I sand and score smooth surfaces before trying to glue them to give the glue more to grab on to.

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Grahamshabam t1_j08uui3 wrote

shortest answer is you don’t glue nylon

long answer is go to the 3M/Bostick/Sika website and use their tools to find a solution that ends up only being sold in 50 gallon drums to specialized industries

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thanatossassin t1_j062dp8 wrote

Yeah, I'd hope they'd put a subcategory for all of the various types of plastics

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