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FOAM LATEX FORMULAS & INSTRUCTIONS FROM GM FOAM
This How-To has been reprinted with permission.


GM Foam Tech Info Incudes: What is foam Latex, Processing, Filling Molds and Curing
www.gmfoam.com/tech_info.html

Mold Prep and Foam Tips for GM Foam
www.gmfoam.com/runschedule.htm

Click here for all GM Foam's run schedules


Using Ultra-Soft to make your foam softer.

How to Use:
For a 150 gm batch, use anywhere from 5 to 12 grams of Ultra Softener. Use this additive in addition to all of the regular ingredients. Expect the following changes to your latex batch:
  • More frothing action, so turn the whip cycle down a bit earlier.
  • Increased softness in the cured final foam, so there is no need to whip as high as usual. Expect to whip at least 1/2 volume less than your usual batch, for the same softness.
  • Use 20 grams Gelling Agent, since Ultra Softener gives you more working time. An added bonus is that it strengthens the cells, so that even very slow gelling batches show no cell breakdown.
  • When refining to the point of adding the Gelling Agent, it is advisable to have the ammonia smell almost completely gone, at the time of turning the mixer off. Don't worry, your foam is protected against a fast gelation.
  • Expect to feel a creaminess in the finished piece that is more flesh-like in its feel, and in the way it wrinkles.


    Alternative Foam Latex Release

    Gil from GM foam uses this in their shop, more often then the regular steric acid provided in the kits.

    Regarding the other release, it is S.C. Johnson Paste Wax (normally used for hardwood floors) mixed with 99% Isopropanol. The ratio is about 1 part wax to 4 or 5 parts alcohol. It is very thin, watery mixture. Paint this into the negative and onto the positive. Don't let it pool. When dry, brush it out with a dry brush. The mold will be sealed, and shiny. It also slows the buildup of brown residue from mold release in the molds.

    On running a very small batch this is the response from GM Foam "The smallest batch we ever run is a 75 gm batch (1/2 regular batch). It has only one special need...since there is so little material in the bowl, there is not much blade action until the foam rises a bit. So we back bowl for the first 2 minutes. Basically, you back bowl for 2 minutes at high speed, then continue running at high, until the desired height is reached...usually a total of 4 or 5 minutes. Then turn the mixer down to speed one to refine. In L.A. we normally pour the gel at 10 minutes, and turn the mixer off at 12. In your humid area (Florida) you probably could pour your gel at 7 or 8 minutes, then off at 8 or 9."


    Gil from GM Foam on Running Foam in Florida.

    "Also, you know our Stabilizer is tailor made to increase working time. It does two things...first, it gives you a quicker frothing action, so you get to height earlier. This means you can turn the mixer speed lower at an earlier time, thereby preserving more of the ammonia in the mix. The second thing the Stabilizer does is protect the rubber from the Gelling agent. The gel has to break down the stabilizer before it can actually react with the rubber.

    For a 150 gm batch, the normal range of Stabilizer is 2 to 5 grams. It will definitely give you more working time. The only warning is to not over whip, and make the foam too soft. It is easy to get away from you. Just don't be a slave to the clock. You know how high you want your foam to rise, right? When you get to that point, turn the mixer down. regardless of the time.

    I feel that you could use our basic instructions in your area as long as you added Stabilizer to the batch (at the beginning, along with all the other ingredients) then just alter the whip time to be less. If, for some reason, you don't have any Stabilizer, adding extra Foaming Agent will accomplish exactly the same thing, although in extreme cases, it can make the foam a little softer than you might want. That is the beauty of using Stabilizer - it doesn't over-plasticize the foam.

    So, in numbers, I would suggest the following:

  • Base 150 Grams
  • Foaming Agent 30 grams
  • Curing Agent 15 grams
  • Stabilizer 2 to 5 grams
  • Gelling Agent 14 grams

    The timing would be
  • Speed 1 1 minute elapsed
  • Speed 10 3 minutes elapsed (or whatever it takes to get our proper volume
  • Speed 4 10 minutes elapsed
  • Speed 1 13 minutes elapsed ... Pour gel now for 20 to 30 seconds
  • Speed 1 1/2 minute back bowl
  • Speed 1 1/2 minute running. Mixer off at 14 1/2 minutes, if you are using Stabilizer"

    P.S. I've also found that cutting back on gel agent works wonders. Thea/FX Warehouse Inc.


    MEASUREMENT CONVERSION CHART

    If you do not have a gram scale, don't worry. You can use kitchen measures instead of weighing the components. This method is not as accurate, but will work out fine until you can invest in a gram scale. Be sure to read the instructions before adding your ingredients.

    The formula for a 150 gram batch is:

    4-1/2 fluid ounces (just over 1/2 cup) Foam Latex Base
    1-Tablespoon Foaming Agent
    1-Teaspoon Curing Agent
    1-Teaspoon Gelling Agent

    Now just follow the instructions. For a 375 gram batch, simply multiply these quantities by 2 1/2.


    Disclaimer: FX Warehouse Inc. will not be responsible for use of misuse of any products you may buy or use from us. Most of our products are for Professional Use only. Use at your own risk.