What Type Of Adhesive?????

Can someone tell me what type of adhesive was used for this? I am in the USA if that matters.

It's a two part epoxy. Not the 5 minute stuff but the slow curing type.
In Europe if I remember in previous posts is called Alderyte?

Joe

jtoolman said:

It's a two part epoxy. Not the 5 minute stuff but the slow curing type.
In Europe if I remember in previous posts is called Alderyte?

Joe

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Right on Joe it’s called Araldite and sets in 45 minutes then cures overnight to rock hard..

According to this post websnail used a hot melt glue, but brand and type is a trade secret. You could try searching for "hot melt glue for polypropylene". Link to the post here: http://www.printerknowledge.com/threads/a-perfect-way-to-purge-everytime.7730/page-2#post-59731

Professional/Industrial grades of hot melt glues suitable for poly propylene do exist, but they are not suitable for use with a hobbyist glue gun as the diameter of the sticks is larger, and the melting temperature might also be higher than for the hobbyist glue sticks.

The clips are made from polypropylene, a plastic it is difficult to get a reliable bond to. The problem is caused by the plastic having a very low surface energy. Teflon is the plastic having the lowest surface energy, and it is this property that makes it non-stick. The surface energy can be increased by treating the surface with chemical etching, corona discharge, or a flame. Here are a couple of links link to surface energy and surface treating: http://www.henkelna.com/us/content_data/Hard_to_Bond_Plastics756739.pdf and: http://multimedia.3m.com/mws/mediawebserver?mwsId=SSSSSufSevTsZxtUo8_9nx2BevUqevTSevTSevTSeSSSSSS--

To improve the bond using a hot melt glue I tried flame treatment, by quickly sweeping the plastic surfaces with a flame from a small propane/butane torch. A quick sweep is sufficient, you don't want to melt or scorch the surface. The treating seems to improve the bonding, but not all hobbyist hot melt glues are suitable for the bonding of polypropylene, you will have to do some testing. In stead of flame treatment you could also roughen the surfaces with abrasive paper or similar.

An epoxy like the classic slow setting Araldite in the blue and white tubes is also usable. I had no luck with cyano acrylate in the form of 10 second glue, super glue or other trade name.

I have done a lot of experimenting making Freedom refill adapters and also used them for purging cartridges, and they have worked well, but the strength and longevity of the glue bond was less than ideal. Till now websnail's adapters seem stronger than mine, so maybe they are worth buying in stead of buying a professional grade high temperature glue gun and suitable glue sticks?

websnail told me that this is a trade secred too.
The adapter did not last that long, maybe 30 refills, and 30 purges.

I had to glue it with a adhesive
http://www.ebay.com/itm/1-x-CLEAR-A...booking_Glue_Tape_EH&hash=item460335144f#shId

Then melt two pieces together with a hot soldering iron. Looks like the picture it will not brake now whatever you do. But I use it for puging only as I use vacuum fill using vacuum pump now.

This is why: http://www.printerknowledge.com/threads/freedom-fill-pump-vs-syringe-fill.8288/

I was expecting that the adapter would last longer, but hot glue is not even epoxy. So I clearly overestimated the longevity if the glue used.

Thanks for all the info all of you!

Smile said:

websnail told me that this is a trade secred too.
The adapter did not last that long, maybe 30 refills, and 30 purges.

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Wasn't aware yours had failed but would have replaced if we'd known.

And yes, sorry, but some stuff took ages to research and test..

I was expecting that the adapter would last longer, but hot glue is not even epoxy. So I clearly overestimated the longevity if the glue used.

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The primary issue with our version #1 flush clips was the luer material we had access to which were polyprop which is not the best plastic to be bonding. We're getting a better luer part for the next version that will definitely improve things including the bond strength.

One important note though. The laws of physics apply to these things and levers in particular. As soon as you attach a syringe it magnifies any force that's applied in opposition to the cartridge direction/angle.

So, some care required. If anyone has borked their version #1s let me know and I'll sort replacements when we're ready.

I did not know that you would send a replacement if my fill adapter failed.

If the adapter was made from ABS it would be easy to glue, the polycarbonate versions are bad they crack.

Smile said:

I did not know that you would send a replacement if my fill adapter failed.

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In fairness you didn't ask but to be honest you resolved the issue pretty permanently with that clip set and your own fix.

If the adapter was made from ABS it would be easy to glue, the polycarbonate versions are bad they crack.

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Agreed, I'm limited by both the material of the clip and that of the available materials for the fittings but I would certainly have given polycarbonate a very wide berth given its brittleness.

The new version will be available after Christmas now, due to supplier lead times and other jobs that have higher, immediate, priority but it's not far off.

I wonder if there would be pros and cons to some epoxy that tends to be stronger and more brittle vs. some that tend to be less strong, but slightly more pliable / flexible?