|
|
Post by emsensors on Jun 22, 2015 2:27:10 GMT -5
We are using the Soft Plastic product with hardener to create an industrial product. I have a mold which is about 8" long, 1" wide and varies in depth from about 1/4" to 3/4". When all is said and done, I end up with a non-flat surface which is presumably due to shrinkage and/or surface tension. The one method to get around this problem on the website involves laying a flat piece of glass over the exposed part of the mold to flatten things out. For various reasons this is not very practical. Are there any other suggestions? I have so far tried very slow cool rates (350F to 50F in 6 hours) but still have a problem. Thanks!
|
|
|
|
Post by mike on Jun 23, 2015 12:06:25 GMT -5
I would suggest pouring it in layers. Pour the first part 1/2-3/4 of the way full. Make sure to wet out the surfaces of the mold and allow it to partially cool/harden. You will notice it will shrink in on the back side. Then take a propane torch or heat gun and wave over the surface just enough to make it glossy, then pour a second layer which is 5/6 of the way full. Make sure to leave an 1/8" area on the top to pour your last layer. This allows the resin to shrink, then cap off, then shrink, then cap off to make it flat. If you pour it all at once, you get a large amount of shrink and a big divot in the back side of your part. Before pouring the last batch, use the heat gun to remelt the surface of the last pour just enough to allow the last pour to chemically adhere/bond to the previous pour.
Mike
|
|
