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Dan Spector
Joined:
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02-Jan-2008
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Started On : 25-May-2009 at 01:54:48 PM, #Views : 6615
Topic Subject : Re: Re: Mixing Alginate: |
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<Lumpy mixes are a problem in about 80% of the locations we have
tested. >
This is a much bigger problem than I would have imagined! This makes
it so prevalent, I think it should be widely publicized. Fortunately
i enjoy Memphis' artesian water.
I ask also, if Dave Parvin has written excellent instructions, these
should be posted, and emailed in their entirety to the membership. No
point keeping best practices secret!
The previous post showed the algy layer held in place with a spring-
clip. Thought all the fiber we've discussed would make that unnecessary.
Happy Memorial Day -
I should go buy a couch.
Dan Spector
901 323 8717
www.lifecast-art.com
dan@archicast.com
On May 25, 2009, at 11:46 AM, aliforum@lifecasting.org wrote:
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> ---------------------------------------------->
>
>
> Hello Dan Spector
>
>
> Post Date : Monday 25th 2009f May 2009 12:35:43 PM
> Posted by : "Ed McCormick" info@artmolds.com
>
> Re: Mixing Alginate::--
> Thanks for your posting. It reminds us that it is time again to
> remind alginate user’s of their responsibility when mixing alginate.
>
> As a manufacturer, we can control the quality of the alginate
> formulation. Ours is twice tested before packaging. Other
> manufactures certainly put their formulas through similar quality
> checks.
>
> However, as with most molding materials there are two parts to
> each. When those two parts are combined, a reaction takes place
> that causes the combination to solidify. For alginate the second
> part of course is the water. The quality of which varies throughout
> the country – it even varies from day to day through public water
> systems. It is especially concerning when drawn from wells where
> quality isn’t monitored at all.
>
> Alginate formulas of most manufacturers are tested using deionized
> water to remove any doubt of extra additives.
>
> So when I speak of water quality, I’m referring to the mineral
> content of your water. The lumps caused while mixing alginate are
> most often caused by excessive minerals in your water such as
> calcium, magnesium and certain potassium salts. So if in testing
> your batch of alginate, you discover a lumpy – or worse oatmeal-
> like mix, I can assure that it not from the powder formula of any
> manufacturer. It is from the excessive mineral content the water
> you are using to mix the alginate.
>
> We do demonstrations all of over the country and the first thing we
> do when we arrive is to mix a small batch of alginate with the
> local water. Lumpy mixes are a problem in about 80% of the
> locations we have tested.
>
> Therefore, we switch to bottled water – or better yet deinonized
> water available at the local supermarket.
>
> As David pointed out you did not supply all the information needed
> to analyze your specific problem. However, it is often the water
> issue. So try that first.
>
> Be sure to follow through with Dave Parvin though, as he always has
> excellent suggestions on preparation and application. Also Dave is
> an ALI Certified Instructor and can provide you with assistance.
>
> Ed McCormick
>
>
> ALI is an international organization whose members are engaged in
> the art and creative industries. Its purpose is to promote the art
> of life casting, create public awareness of this unique art form,
> provide its members with forums to exchange information, resources
> to enhance their effectiveness and advance opportunities for their
> artistic success.
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