Silicone Jig Molds
39 replies to this topic
Posted 27 March 2012 - 10:50 PM
I seen a video on pouring molds using high temp silicone, has anyone here done it? I'm curious on how they hold up, and if someone can point me in the right direction on what I all need to give it a shot and where to buy the material, i would be forever grateful.
Posted 28 March 2012 - 05:05 AM
I have done it and so far they hold up great. The beauty of it is that you can replicate almost any jig and change hooks as you want. Here are some of the ones that I have made http://s1057.photobu...s/t389/Paxamus/ i got my silicone from Jim at Sunbelt Materials- he is a great guy with fast shipping. I used the Rhodorosil v340.
There are alot of nuances to making a mold and I would be glad to help with any questions.
Posted 28 March 2012 - 07:44 AM
Paxamus, not to hijack the thread but can you use the same mold material you use to make temporary inserts to aluminum molds? I have used all sorts of material to make weedguard fillers and such so I was thinking I could use it to fill weedguard slots and use wire weedguards.
Posted 28 March 2012 - 08:00 AM
Shouldn't be a problem. You would have to take a jig and place it in the mold, then pour the silicone in that half( mold open at this point) to fill the weed guard hole. Then once dry repeat in the other half. cut a small slot for the wire weed guard and pour
Posted 28 March 2012 - 08:38 AM
Your jigs look great, my plan is to make a 3 jig mold, how long does a side take to setup? and what was a ball park figure on the price to make one? I read some where Lego's work well for making a form,anyone try that?
Posted 28 March 2012 - 10:57 AM
I use Legos for my mold boxes and they work great. With the small thing of Rhodorosil from Sunbelt you should be able to do it, but I would caution making a 3 jig mold. I would make three one cavity molds, because if you make a three cavity, the silicone makes the cooling of the jig take longer, so with three cavities it would keep your mold hotter longer and then have longer demold time and your silicone mold will stay hotter longer and lessen the life of your mold. I personally have made a two cavity and used it but was MUCH happier making single cavities and pouring one, then while it cools pour another. Plus you actually use less silicone.
Setup is 24 hrs for a complete cure for each side.
Let me know if I can help.
Posted 30 March 2012 - 10:32 PM
How did you do the mold? Wait for it to set up a little and punch the jig in? Or did you suspend it in clay an pour the silicone? The mold looks good. I made some Plaster of Paris molds for a prototype jig and it turned out ok. I think silicone is in my future though.
Posted 31 March 2012 - 03:06 AM
I've found great Paxamus's explanation in the:
Posted 31 March 2012 - 06:41 AM
Sink your mold halfway into modeling clay, then build a mold box around the area you want to pour, place your keys. Measure your silicone, mix, then pour the first half. Wait 24 hrs, then demold, clean up any overpours then place jig in silicone mold from the day before and repour the other half. If you write down the amount you used for the first half you can eliminate that step and just pour.
Posted 31 March 2012 - 05:00 PM
Are there a modeling clays that after hardening could be used like molds instead of silicone?
Edited by ING, 31 March 2012 - 05:03 PM.
Posted 31 March 2012 - 09:55 PM
Not that I am aware of, I think that the heat of the lead would make the clay crack.
Posted 31 March 2012 - 11:50 PM
One more question: why did you choose V340 from long list: V-240, V-243, V-249, V-252, V-252 Diluent, V-330, V-340/CA-35, V-340/CA-45, V-340/CA-55, V-341,V-360, V-3038, V-3040, RTV-1556, RTV-1597...?
Some of them have a better tempereture range[-55 to 249 (-65 to 400)] vs. [-50 to 150 (-58 to 302)] of V340.
Edited by ING, 31 March 2012 - 11:53 PM.
Posted 01 April 2012 - 06:43 AM
I wasn't sure looking at them if they would even hold up to leads high temps, so I called the owner, Jim Dailey. I told him what I was going to use the silicone for and he told me to use that one. Others may work, but that's the told me to use and dlaery on this website had used v330. So that helped
Edited by Paxamus, 01 April 2012 - 06:49 AM.
Posted 17 July 2012 - 12:15 AM
I beleive that smalljaw is on to something using the silicone as an insert in aluminum molds. Many times I like to use a smaller hook size and of course the mold eye cavity is always too big and placement is tedious and at times inconsistant. However it seems reasonable that with a silicone insert in the mold eye cavity one could use any hook size with consistant depth placement of the eye. Good idea smalljaw.
Posted 25 July 2012 - 09:41 PM
I've been doing this with Do-It molds for years...use high heat silicone gasket-making goop that Permatex sells in tubes for automotive gasket use. Works like a charm & if you want to remove it later it comes out pretty easily with a little work.
Posted 30 July 2012 - 07:58 PM
The past week I have been using some graphite mold release spray Blaster 5.5 oz. Graphite Dry Lubrican P/N 8-GS from Home Depot. Sprayed it on, let dry for about 10 minutes and bushed off the excess. High Temp says 850F and the 10, 1.5 oz heads I did all did well.
Posted 30 July 2012 - 08:01 PM
Should have added Home Depot is where I got it, also online... http://www.homedepot...gs#.UBcs8y4bBFk at US$4.27