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Giuliano · 12-31-2004, 09:34 AM

Quote: Originally Posted by Seraph

Let me know what kind of liquid rubber you are going to use and what kind of plastic you are going to use to mold the final product. I have a slightly different project (Subaru SVX Related) that I am working on that I am stuck because of this.

My initial cast may depend on what rubber I can find at my local stores, but as for the kind of rubber, it's silicone RTV rubber.

RTV = Room Temperature Vulcanizing, where it cures at room temperature (as opposed to in an oven).

I generally prefer the silicone rubbers and polyurethane resins from PolyTek:

http://www.polytek.com/

Silicone RTV rubber:
http://www.polytek.com/products/silicone_mold.html

I generally prefer the TinSil 70-25 series rubber for most applications:
http://www.polytek.com/products/tinsil70.html

Silicone rubbers, as opposed to polyurethane rubbers, are generally non-stick, so you don't usually need to coat the mold with a release agent prior to casting.

As for the polyurethane resin (plastic), I like PolyTek's Poly 15 series:
http://www.polytek.com/products/poly15.html

The Poly 15-6 is good for general part prototypes, and the 15-3 is contains a filler material, good for final part runs.

If I can't find what I need at my local stores today, I'll probably end up ordering a 8-9 pound bucket of rubber, and a 4-5 pound bucket of resin.

12-31-2004, 09:34 AM	#8
Giuliano Maximum Bitrate Join Date: Feb 2004 Posts: 749 My Photos: ()	Quote: Originally Posted by Seraph Let me know what kind of liquid rubber you are going to use and what kind of plastic you are going to use to mold the final product. I have a slightly different project (Subaru SVX Related) that I am working on that I am stuck because of this. My initial cast may depend on what rubber I can find at my local stores, but as for the kind of rubber, it's silicone RTV rubber. RTV = Room Temperature Vulcanizing, where it cures at room temperature (as opposed to in an oven). I generally prefer the silicone rubbers and polyurethane resins from PolyTek: http://www.polytek.com/ Silicone RTV rubber: http://www.polytek.com/products/silicone_mold.html I generally prefer the TinSil 70-25 series rubber for most applications: http://www.polytek.com/products/tinsil70.html Silicone rubbers, as opposed to polyurethane rubbers, are generally non-stick, so you don't usually need to coat the mold with a release agent prior to casting. As for the polyurethane resin (plastic), I like PolyTek's Poly 15 series: http://www.polytek.com/products/poly15.html The Poly 15-6 is good for general part prototypes, and the 15-3 is contains a filler material, good for final part runs. If I can't find what I need at my local stores today, I'll probably end up ordering a 8-9 pound bucket of rubber, and a 4-5 pound bucket of resin.