Re: 21-23 series rubber sill plates.
Posted by HH56 On 2014/12/15 11:40:12
Made the new lid for the pressure pot and used my AC vacuum pump as the source. It quickly pulled a nice 29" vacuum in the pot and had plenty of working time on the material.
Am pleased to report the vacuum degassing of the Econ 80 urethane rubber was a success and reasonably happy with how the piece turned out. Not a bubble in sight. Also not sure if it was the degassing or not using any release agent in the silicone mold was the reason but this time the rubber cured to a dull finish and not the typical urethane shiny finish the other test pieces had. I think it looks very much like a vulcanized rubber part.
Now on to the other pieces. I learned on this one to get all the glue off the plaster model where I joined the 47 name to the 48 body or it casts thru as shiny -- even under the shellac sealer. You can see it just above the name and not sure if there is a fix or if it will wear or dull down.. Have the plaster casting for the other rear piece sealed and ready for pouring the silicone mold today. Once all the other pieces are done and if they look better in that area I will probably go back and do this one over.
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Am pleased to report the vacuum degassing of the Econ 80 urethane rubber was a success and reasonably happy with how the piece turned out. Not a bubble in sight. Also not sure if it was the degassing or not using any release agent in the silicone mold was the reason but this time the rubber cured to a dull finish and not the typical urethane shiny finish the other test pieces had. I think it looks very much like a vulcanized rubber part.
Now on to the other pieces. I learned on this one to get all the glue off the plaster model where I joined the 47 name to the 48 body or it casts thru as shiny -- even under the shellac sealer. You can see it just above the name and not sure if there is a fix or if it will wear or dull down.. Have the plaster casting for the other rear piece sealed and ready for pouring the silicone mold today. Once all the other pieces are done and if they look better in that area I will probably go back and do this one over.
Attach file:
(82.51 KB)
(46.21 KB)
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