Plastic welding ? Repair cracked sunglasses

[Jacobson]

Right at connector bridge of the nose.
I tried Crazy Glue and they broke again.

Can I plastic weld?
Will this be stronger?

Can I just use my soldering iron to melt the seam a bit ?

 

[5ubtle]

I have not used the stuff, but I find it interesting. If you use it, please tell us your thoughts.

 

[Jacobson]

Interesting! Couple of negative reviews in that video.

 

[driz]

I haven’t used it but have one observation . Glasses usually break in a way and place that’s nearly impossible to fix. That’s just the nature of the materials weights thickness ect....


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[CJM8515]

https://www.amazon.com/dp/B00HX704NG/?tag=atomicindus08-20

 

[LXCam]

This stuff seems to hold every damn plastic I've come across



Also loctite makes a two part glue that's rated for everything plastic.

 

[bonneyman]

Plastic Welder by Devcon.

https://www.walmart.com/ip/Devcon-Plastic-Welder-Epoxy/20370985

 

[matthew]

At a molecular level, plastics look like spaghetti that's all tangled together. That means that when they break, it's like taking a plate of spaghetti and cutting it - you can put glue in the seam, but there's still a seam, and the glue is the critical link, it won't have the continuous strands of spaghetti for strength like it originally did. And plastic "welding" might also stick the two halves together, but hasn't actually relinked the molecular chains.

I wouldn't be afraid of trying to glue it. You might find a glue that has a high bond srength. But peel strength, brittleness, temperature resistance might be limiting depending on the glue you use.

 

[FigureItOut]

I have not used the stuff, but I find it interesting. If you use it, please tell us your thoughts.

I've used it. It works extremely well but has limitations. It's not an adhesive really, it fuses to the plastic, so two flat surfaces stuck together won't stick. It's more like a weld joint, but with zero penetration. It'll only stick where the UV light gets to it, so you kinda have to build up new material around the joint.

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[toplessHO]

I've used it. It works extremely well but has limitations. It's not an adhesive really, it fuses to the plastic, so two flat surfaces stuck together won't stick. It's more like a weld joint, but with zero penetration. It'll only stick where the UV light gets to it, so you kinda have to build up new material around the joint.

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then would be better to slightly bevel it before bonding it

 

[99LeCouch]

West Systems makes an excellent plastic epoxy. It works well with their silica filler to bridge gaps. The downside is its $40 and dries yellow. It is made to flex some, and put up with abuse. Its held up on a cracked car top carrier so far.

 

[Jacobson]

https://www.amazon.com/dp/B00HX704NG/?tag=atomicindus08-20

Got good reviews. You've used it ?

 

[CJM8515]

Got good reviews. You've used it ?

Many times, works well. It’s basically superglue with ground up bits of plastic powder you use to reinforce it.

 

[bpankratz]

I have not used the stuff, but I find it interesting. If you use it, please tell us your thoughts.

I've used it, it's not a fix for everything but in this case would probably work very good.

 

[driz]

I’m glad to see Devcon finally hitting the regular stores. I’ve used their ceramic industrial epoxy in the past and it was fantastic. More like a poltice than a goo that runs on a vertical surface


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[pepi]

Think I'd use my time finding another pair. Already fixed, LMAO once ...

 

[driz]

If I was fixing glasses like that I’d put my epoxy on first the quickly set a pin along the inside middle of the frame .Then heat with a hot soldering iron till it’s buried in the plastic. After that add some epoxy wrapped in a slight bulge.
I’ve done just enough plastic welding to know 3 things. It reeks. It is so much harder than any sort of metal welding. Last, if you want any strength embed some metal reinforcement just like concrete. Pins, small nails, aluminum screen ect. Behemoth you watch the pros on YouTube that metal rebar is their secret sauce. Plastic Welding may be hard but putting in reinforcing is quite easy[emoji847]


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[bonneyman]

I’m glad to see Devcon finally hitting the regular stores. I’ve used their ceramic industrial epoxy in the past and it was fantastic. More like a poltice than a goo that runs on a vertical surface


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Once I tried Devcon's Plastic Welder when working at the hardware store it's become my go to for gluing plastic. When doing dissimilar materials I use Gorilla Glue 2-part epoxy.

 

[Jacobson]

If I was fixing glasses like that I’d put my epoxy on first the quickly set a pin along the inside middle of the frame .Then heat with a hot soldering iron till it’s buried in the plastic. After that add some epoxy wrapped in a slight bulge.
I’ve done just enough plastic welding to know 3 things. It reeks. It is so much harder than any sort of metal welding. Last, if you want any strength embed some metal reinforcement just like concrete. Pins, small nails, aluminum screen ect. Behemoth you watch the pros on YouTube that metal rebar is their secret sauce. Plastic Welding may be hard but putting in reinforcing is quite easy[emoji847]


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How do your embed a pin inside the glass frame? Drill? How do you melt with solder iron on the outside?

 

[AZ Pete]

Locktite Plastic Bonding System. I have used this product to glue plastic that Would not stayed glued with other products. About $5 at your local Ace, or big box lumber yard. It has a felt tip pen of primer and a tube of glue.


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[mark#3]

I read where you add baking soda to super glue, then it becomes a very hard glue?