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Thread: Any Advice, Acrylic Adhesives?

  1. #1
    Join Date
    Feb 2014
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    Any Advice, Acrylic Adhesives?

    Pardon the alliteration and I'm sure this has been asked before, but I cant find the answer easily, so thought I'd ask. What is the best adhesive for sticking clear cast acrylic together?
    Cheers, Steve

    --

    Trotec Speedy 300, Rated at 89.8 watts.
    Atmos Duo, Rotary Attachment, Corel Draw 7

  2. #2
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    Steve,

    Check with Tap Plastics web site. If you are in their site and search for Glue Acrylic they will give you some videos on using various adhesives on acrylic and how to do it. Typically you use a solvent rather than an adhesive on acrylic. Weldon is one of the solvent/cements used. It has a number of formulations depending on your need and the materials. TAP has a lot of information on it.

    Hope that helps.

    Dave
    900x600 80watt EFR Tube laser from Liaocheng Ray Fine Tech LTD. Also a 900x600 2.5kw spindle CNC from Ray Fine. And my main tool, a well used and loved Jet 1642 Woodlathe with an outboard toolrest that helps me work from 36 inch diameters down to reallllllly tiny stuff.

  3. #3
    Join Date
    Sep 2011
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    naples florida
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    hi there
    take a few little pieces of the acrylic and dissolve then in aceton till its like suppy.that's the easiest and cheapest glue for acrylic and much cheaper
    greetings
    waltfl

  4. #4
    There is Weldon 3 and Weldon 4... I forget which is which. Both are water thin, one is fast set, one is slow. The slow set uses pure acrylic solvent which I believe is not flammable and not carcinogenic. It won't leave white spots (blushing) if dripped ont he material and allowed to dry without touching it. It's less likely to cause crazing (stress fractures along the laser cut edge). But it is important that pieces be held in place for several minutes to set. The other version of the glue sets within 30seconds, is flammable and carcinogenic. Neither of these are gap filling so it's important that the joint be smooth and flat.

    Weldon 16 is a thicker liquid that comes in a tube. It's somewhat gap filling. It sets slowly.

    Acrylite (acrylic manufacturer) makes similar versions. They also have one called "Bright" which is similar in consistency to the Weldon 16 but is UV curing. It is very clear and hardens strongly. It seems more prone to crazing, but it's very strong and gap filling.

    There is also a 2-part epoxy that requires mixing before application. This is also gap filling and super strong. It's used in aquarium manufacture.

    These all fall in the category of solvent glues... meaning they soften the acrylic to create a better bond. But that's also what allows crazing to occur. Crazing occurs because the laser dramatically heats the immediate material around the cut. This creates an imbalance in the stresses in the material. The only way to release the imbalance is by annealing the plastic... slowly heating it up to a specific temperature and then slowly cooling it. This isn't really practical for most of us. Extruded acrylic is far more likely to craze than cast acrylic.
    170 watt pulsed CO2 laser from Vytek, 48x96" table
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  5. #5
    Join Date
    Feb 2014
    Location
    Milton Keynes, UK
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    Thanks guys... some good advice and food for thought.
    Cheers, Steve

    --

    Trotec Speedy 300, Rated at 89.8 watts.
    Atmos Duo, Rotary Attachment, Corel Draw 7

  6. #6
    Hi Steve

    FYI Weldon is extremely strong as it chemically melts/welds the plastic together, so if you make a mistake it will not wipe off cleanly. Epoxy is much cleaner to work with but not as strong. If you have a good supply of syringes you can use the really runny weld on 4. See this video for how to apply.

    https://www.youtube.com/watch?v=hT6Ow_cBTps

    Cheers
    Keith
    Universal Laser VLS6.60, Tantillus 3D printer, Electronic design
    edns Group, Mairangi Bay, Auckland, New Zealand

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