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Post by bbailey8183 on Sept 17, 2015 19:49:17 GMT -5
I have been molding and casting for awhile now and I have never ran into this before. I was making a mold of a clear plastic slipper from our wedding (10 years ago). it is hard plastic, 1/4" walls. I filled the inside cavity with clay as I have hundreds of times before. I had to use two packages to completely cover the slipper. Poured the rubber and come back 5 hours later. The outside was exactly as I would have expected. Started to demold and I discovered the inside was still liquid. That I can understand. What got me was the slipper was shattered. Broken in three pieces and large cracks running everywhere. I don't understand how. The piece was old but was stable when I started. No tempature difference, no increase in pressure, no hard hits or anything. I mean it was surrounded by rubber! It just does not make sense. Possible chemical reaction but no increase in temperature and no color change. Just does not make sense.
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Post by mike on Sept 18, 2015 8:39:26 GMT -5
Very strange. What clay and rubber did you use ... the blue Synthetic Modeling Clay? High Strength or Plat 55 or ?? Another question or can you explain further "... the inside was still liquid. That I can understand."  I'm not sure why the outside would be cured and the inside would be liquid? I'm not following that and don't understand why it would still be liquid. Can you send us some pictures ... world(at)alumilte(dot)com Please also email us your phone number and a time that would be ok for us to contact you. We can try to figure this out over the forum but I'm thinking it might be a 20 questions thing and quicker to communicate verbally if able. thx, Mike |
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Post by bbailey8183 on Sept 18, 2015 18:46:25 GMT -5
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Post by mike on Sept 21, 2015 9:25:37 GMT -5
Very strange. I've never seen anything like it. I will check to see if we have rec'd any other pics? Is the original slipper actual glass or some type of acrylic or plastic?
Mike
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Post by bbailey8183 on Sept 22, 2015 0:54:04 GMT -5
It was plastic. Hobby lobby will not do a return on the two contanors of High Strength.
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Post by carol - Alumilite Corp on Sept 22, 2015 15:14:47 GMT -5
Hello..... that is strange. If you would like to call us bbailey8183, I have a few questions and would like to get some information to see how I can help you.
Regards,
Carol
800-447-9344
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Post by yamato71 on Jan 25, 2017 2:38:41 GMT -5
I have often seen clear cast acrylic objects craze and crack when exposed to certain solvents that do not actually dissolve acrylic. I seem to remember that the issue would occur with low vapor pressure hydrocarbons such as naptha, light oils, kerosene, etc. The phenomenon can be seen by dipping a short length of plexiglass rod into naptha (lighter fluid) and observing the rod while it is back lit. Soon the rod will be so full of cracks that it will literally crumble. I suspect that the non-polar solvent is somehow interfering with the crosslinking, which are usually just relatively weak hydrogen bonds anyway. Somehow, I suspect that this information isn't going to sooth the spousal unit one bit. You have my profound sympathy sir.
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I'm not sure why the outside would be cured and the inside would be liquid? I'm not following that and don't understand why it would still be liquid.
