Has anyone else experienced this problem?
Over the years I have had the occasional casting investment failure,
almost always on pieces with flat surfaces more than half an inch wide and
more than an inch long. What typically happens is a flake of investment
spalls off the surface and the metal encapsulates the flake. It hardly
happens at all on curved surfaces, smaller or perforated designs.
Let me be clear, this is not something that happens often. I do enough
casting that I run through 1,000 lbs of Satincast-20 in a year.
So earlier this week I had a job to make a 14K bracelet, .75 inches wide,
cast in two pieces 3.5 inches long. I will spare you the play-by-play, but
in all 5 out of 6 attempts to cast the piece failed as described above
using Satincast-20. I solved the problem by using R&R Plasticast for the
final, successful casting.
Something that usually happens about 1% of the time, or less, suddenly has
happened 83% in one week! I switched to a new package of investment after
the first failure.