Feb 25, 2011, 7:51 PM - Food safe resin?
I'm looking to cast a pair of Dr. Who Dalek for use as salt and pepper shakers.
My plan is to use a castable/pourable resin/epoxy/plastic/etc. and then drill it out to form the salt/pepper area, with small holes drilled at the top for the output.
The one thing I'm most concerned about of course is the food safety aspect of the plastic/resin.
I've checked Tap Plastic's website, reviewed the MSDS, etc, and haven't been able to find anything that says one way or the other anything about the finished product's ability to be food safe. The closest I got was one product mentioned that it wasn't good with Metal Salts. Not sure of table salt qualifies, but I'd probably stay away from that on principle.
Does anyone know of a good product that I can investigate?
Feb 25, 2011, 9:33 PM - Re: Food safe resin?
Feb 25, 2011, 10:37 PM - Re: Food safe resin?
Smooth-On Task 11 says it's safe for dry food contact.
Lots of silicones that are made for food applications, but not many plastics.
Feb 25, 2011, 11:42 PM - Re: Food safe resin?
I've run into the same problem. I was casting a drinking cup in resin before I found out it's not food safe. I'm redoing it in styrene now which is what most food containers are made of.
Feb 26, 2011, 12:09 AM - Re: Food safe resin?
Can you embed a plastic or glass container inside the resin?
Feb 26, 2011, 9:28 AM - Re: Food safe resin?
Feb 26, 2011, 11:03 AM - Re: Food safe resin?
You could try casting with a regular shaker with removable top inside.
Over the openings of the cap attach surgical steel tubing so there is no chance of contamination from the resin.
Feb 26, 2011, 12:47 PM - Re: Food safe resin?
Check out a company call Hapco hapcoweb.com
They're somewhere near Boston.
Be prepaired for the much higher prices for the specialty medical resins.
Feb 26, 2011, 3:57 PM - Re: Food safe resin?
Vacuforming would probably be the way to go with styrene, short of scratchbuilding it. Once you formed the main body, you could add the detail on top. That's what I'm planning to do.
Feb 26, 2011, 10:46 PM - Re: Food safe resin?
Styrene, also known as polystyrene is very common. Almost any plastic item you can think of, from appliances to toys to model kits; if it's injection molded it's probably styrene. Many plastic cups and dinnerware also. Vac formed trooper armor too. Styrofoam is whipped styrene. It should be safe for what you want to do.
The basic shape could be vac formed. Then the finer details could be sculpted from heavy styrene sheet stock and glued on. Use non-toxic model cement, they're usually citrus based solvents.
Feb 26, 2011, 11:38 PM - Re: Food safe resin?
This is misleading and incorrect, their are some 'FDA' approved ones for dry contact, and there are other ones that are 'safe' as well, but might not be 'FDA' approved for food, doesn't necessarly mean they are not safe...
A perfect example is dental acrylic although it might not 'FDA approved' for food use, if it's safe enough to make fake teeth and dentures out of that will be placed inside your mouth for extended periods of time then IMO it's certainly safe enough for limited food contact and use...
I'm also too lazy right now to dig into it to see what approvals these have but McMaster-Carr list several flexible casting urethanes that are FDA approved... They are rubbers but still very hard...
And I'm sure as pointed out if you poke around in the medical fields you will find other 'safe' resins...
Feb 27, 2011, 7:35 AM - Re: Food safe resin?
silicones yes,resins no.show me the FDA approval for resins?Your opinion is just that,an opinion.
Feb 27, 2011, 7:40 AM - Re: Food safe resin?
Thanks for another great idea division! I wouldn't have thought to use the tubing for the holes.
division 6 said:
modelnutz - I'll probably swallow my teeth when I get the prices, but I've got them on my list to call on Monday!
BornKIlr - I've been toying with the idea of making a vacu-forming rig... This would be a justification... "But hon, I can't make your present without it!"
robn1 - I'll keep this in mind! In fact, I just came across an Instructable on making an injection molding unit.
DOH! I've got McMaster-Carr on my frequent bookmarks, but I hadn't even considered them for something like model making supplies. My preconceptions hold me back almost as much as my ignorance! Thanks exoray!
Thanks again everyone!
Feb 27, 2011, 2:22 PM - Re: Food safe resin?
Did you miss the Task 11 link posted previous, that is FDA approved?
Did you miss the McMaster-Carr link I posted, that had multiple FDA approved hard casting rubbers?
Did you miss the Hapco, Inc reference above? Here is an example of one of their FDA approved resins http://www.hapcoweb.com/steralloy.htm
And did you miss my entire post in regards to dental acrylics (white fillings and bondings, dentures, fake teeth) that are FDA approved resins as well?
If you require more FDA approvals like this one or this one or this one heck here is a list of 100+ FDA approved resins... If you need a specific approval then contact the manufacture of the resin you plan to use, I'm sure they would be very happy to show you their approval...
FACT is FDA approved resins do exist, it's not my 'opinion' its a fact...
And just because the FDA doesn't approve it for a specific use doesn't mean it's unsafe for that use...
Nor does FDA approval mean it's safe, the FDA is constantly changing their minds, just look at the drug industry, the FDA has approve many 'dangerous' drugs... The FDA is constantly approving drugs for 'adult' use but physician regularly prescribe them to children in lower dosages...
Last edited by exoray; Feb 27, 2011 at 2:35 PM.
Feb 27, 2011, 5:19 PM - Re: Food safe resin?
Oh, c'mon exoray. Don't let those pesky facts get in the way. He said "there is none....." Isn't that good enough for you?
Apr 17, 2011, 4:43 PM - Re: Food safe resin?
Well, I've finally taken the plunge, and started my mold. Unfortunately I've already screwed up.
I had already decided that I was going to take a "riskier" route with the mold and do a single pour from the top with the base in clay so I would simply pull the dalek from the mold. There are some overhangs involved, so I knew it might blow up on me. Unfortunately I found that I didn't have enough silicone to make the full pour. Since I can't get any more silicone tonight I'm going to let it set up, and then see if I can add the rest on top. It may be for naught, but if nothing else I'm having a blast and I'll learn what not to do!
Apr 17, 2011, 5:07 PM - Re: Food safe resin?
Your mold should still come out fine. Silicone sticks really well to itself, just not to much of anything else.
Apr 17, 2011, 5:12 PM - Re: Food safe resin?
This is brand dependent, not all silicone sticks to itself...
Rick Hanson said:
Apr 17, 2011, 5:18 PM - Re: Food safe resin?
Interesting...I've honestly never used any that didn't. I guess I'll amend that to "if you're using a typical hobbyist brand, it should be OK."
Apr 17, 2011, 5:22 PM - Re: Food safe resin?
I'm using Smooth-On PMC 121/30, and my plan is to get more of it tomorrow. Even if it doesn't stick together I figure I'll have a... um... Unique... parting line. Yeah, that's it.
I'm using a 3 liter soda bottle as the outer shell of the mold, and I've got that compressed into an oblong, so I'm not even too worried about registration issues if I wind up with two distinct mold pieces.
It will be what it will be, and I've learned alot already.
Apr 17, 2011, 5:42 PM - Re: Food safe resin?
The stuff I regularly use has about zero bonding to itself normally... I have made numerous small 2 part molds without release between the layers, and it's like pealing up a sticker to separate the two halves...
Rick Hanson said:
The only way I can get it to bond to itself is to add a cure accelerator, don't know what that changes but it increases the bond... But it's hairy stuff to work with in small amounts, one drop or two in a small mixture can take your 12 hour silicone down to a few minutes...
To the best of my knowledge Smooth On does bond to itself...
Apr 22, 2011, 1:09 PM - Re: Food safe resin?
I never thought that getting the materials would be harder than doing the actual work.
I went back to the modelling store where I'd gotten the molding rubber and they didn't have any, but would order it. (Due in Wednesday, we'll call you when its in)
I hadn't heard from them, so I called today. (Oh, yeah... That's in)
I stopped by at lunch, they'd ordered the molding plastic, not the molding rubber. (Now due in Monday)
I tried ordering the Steralloy, they can't ship it FedEx Ground to a residential address because it's a hazmat. (Anyone else find irony in a food safe plastic being hazmat? )
If I ship FedEx Express (or Priority) I can have it held for pickup at the local depot, which will only(!) cost me about $30 more in shipping.
Nothing insurmountable, but sometimes I have to wonder if it's even worth gnawing through the straps in the morning!
Feb 28, 2013, 8:53 AM - Re: Food safe resin?
[FONT=Calibri][COLOR=#000000]Hi. Iím with Hapco, the manufacturer of Steralloy casting resins, and wanted to explain the Hazmat shipping requirements. These materials are two part reactive systems and the individual components do contain chemicals which the Federal Regulations require to be shipped HazMat. It does certainly seem ironic but once the components polymerize in the curing process they form a safe, inert plastic material. This is somewhat analogous to sodium and chloride both being dangerous alone, but when combined make table salt. [/COLOR][/FONT]
Feb 28, 2013, 10:47 AM - Re: Food safe resin?
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