Hi
I need a tiny ( 100ml ) amount of food safe epoxy resin to fill a slot in a 40mm thick price of delrin nylon 66.
Needs to set overnight in time for drilling the next day , so 24hr roughly.
The nylon 66 is black and it really needs to match this .
No load on it , not threaded just accept a 12mm bolt once it's cured .
Somebody must have bought or used something similar recently.
I have resin and black dye if you want to pop over?
Sorry, just spotted that you want food safe.
That is quite an odd combination. Is it all essential, as being a bit less prescriptive might open up your options.
Why epoxy? It probably is the strongest material but an MMA adhesive might also work.
Epoxies are generally considered non toxic, most cured 2k adhesives are. But it depends on how specific you are about food safe. If its in an industrial food setting where it is a requirement then you'll need an approval which means your options are really limited. If doing something at home I'd not worry about either MMA or epoxy coming into contact with food or water if limited to accidental, non normal service.
I'd probably look at adhesives, most likely to be in the right volume range. Lots of chemistries, often available in black. Limited food safe options.
Permabond have a FDA approved epoxy product. Not black though.
Didn't know epoxy would stick to Delrin.
Get a clear resin and a black pigment.
Pigment come in poweder or (i think alcohol based paste)
Might try sikaflex . It's a gap filling adhesive, it doesn't set rock hard though.
Sikaflex won't hold screws or bolts well.
Every time I see a <really> specific need like this with absolutely no information about what it's for I assume it's a kink thing. But even I'm struggling to figure out exactly what deviant practices this is for.
It mostly sounds like a job for a urethane tbh. Maybe with an insert for the bolt but depends on the actual job.
im not 100 percent sure what delrin is but i would def be concerned about epoxy bonding to it and a differential in hardness.
Black pigment i use artificial black iron oxide which is blacker than a black hole and very dissolvable. No idea if food safe
May be worth looking Easy Composites to see what they have. I have successfully their carbon repair compound for a number of jobs, but not sure whether it is food safe? Delving/acetyl adds another complication in terms of bonding - MMA might be better suited as it’s ‘stickier’ but doesn’t dry as hard/better suited to bonding so maybe use to bond an insert to the Delrin rather than use as a filler?
im not 100 percent sure what delrin is
I'm fairly sure it's a form of very hard wearing plastic.
Seeing as epoxy is also a form of plastic you'd have thought they were compatible, but Delrin also makes a good wear surface as it's kinda slippy.
(I have some on my boat in a U channel where it forms a track that a vertical, pretty heavily load bearing, aluminium plate can run in.)
Delrin = self lubricating nylon . Fairly hard wearing .
The bolt that goes through it isnt loading the filler . It is in the middle of a sandwich .
If I told you its for an island on a rotary filler most people still wouldnt know what that was , hence why i left it out the dsecirption
Delrin = self lubricating nylon . Fairly hard wearing .
The bolt that goes through it isnt loading the filler . It is in the middle of a sandwich .
If I told you its for an island on a rotary filler most people still wouldnt know what that was , hence why i left it out the dsecirption
Ok, so it does need to be food safe, not "probably food safe". Just did a bit more reading on Delrin and you'll struggle. I wouldn't have thought a standard epoxy would bond well to it. You are now into a real niche area. 3M have some products that I can't recall the name of. Scigrip SG400 could work. You might be able to prime it or otherwise surface treat it. A cyano acrylate (super glue) coat might help. In any case you'd want to check adhesion. MMA might do better than an epoxy as its a good solvent and will partially dissolve the surface which epoxy would not do.
Many plastics are hard to bond to. Its a big challenge in the adhesives industry. Some like poly carbonate are fine others really tricky.
If you wanted to tint then I'd probably go for a carbon black power as it is inert. Adding metals to these type of systems can give interesting results. In theory you'd want equipment to disperse it but in reality you could make it black just with vigorous hand mixing.
Small amount ? Opt for West System.
They do small 'repair' sized packs. about 25-30 quid.
West system epoxy is high quality and you get all the parts needed - measuring/mixing etc. You will need a pigment, but those are easy to get and I'd recommend Mixol universal stainer
The 20ml bottle is about £8
"Mixol 20ml Black (#1) is a highly concentrated, binder-free, liquid universal pigment ideal for epoxy resins, creating a consistent, deep black finish while allowing for transparency if used sparingly. It is compatible with most epoxy systems, does not dry out, and is easily mixed, generally requiring only a few drops to tint large quantities"