Mixing Silicone

scale & "Part B" drill & "Part A" mixing in "Part B" sides need mixing!

A scale becomes necessary for mixing 10 to 1 ratio silicones. (It's also helpful for mixing plasters consistently). This scale weighs in both grams and ounces, and has a "tare" feature. When activated, this feature subtracts the weight of the container so you can weigh just the material you add. It cost about $45. I honestly don't remember where I got it, but there are some links listed below for scales. The mixer is a frother from a milk shake machine. A paint mixer should also work. Be sure the sides of the container get mixed.

even color means well mixed the mold box pouring into the mold box mold box in the chamber

The mold box is made from plex-glass, and polythylene rectangular bar (1/4" x 3/4") from McMaster-Carr. A mold that's 4" x 6" seems to be the idea size. I got the idea of casting it upright from Making an RTV Mold for Wax Injecting . Unfortunately, it didn't work as well as expected, and some air bubbles got trapped even when vaccumed. I found it's better to lay the box flat. After it's been vacuumed about 10 minutes or so, I can then lay a piece of plexi on top and gently press down, and add some weight to hold it until it's dry. This gives it a smooth bottom. Otherwise, it's pretty ulgy and uneven, which makes it problematic to scrape and clean. The foil is to help pour, and to help contain the silicone when it expands. I got a little sloppy trying to pour and take the pic! Alas, I had to return the camera, so currently I have no pics of the mold that did turn out well (when layed down & vacuumed in the short chamber)!
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Links for Scales:
Digital Scales
Scales Galore
Right On Scales
Compact Scales

Other Links:

SPI Supplies
check out these beakers - useful for pouring resin, which can get messy.
Also available in smaller quantitles from Bare Metal Foil's Specialty Items

Sites for measures & conversions
Wiha Metric Conversions
Dry & Liquid Measures
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