What factors contribute to shrinkage in molding & casting parts?Updated 23 days ago
Shrinkage is different by chemistry. Tin curing silicones systems will have some minimal shrinkage ... approximately .25%-.48%. Platinum based silicones will have zero shrinkage. The majority of Alumilite casting resins have some shrinkage but is normally unnoticeable in small or thin castings. Most users find shrinkage is very minimal and that it does not effect their castings unless the parts are big or have significant mass. Users needing high accuracy should use a platinum silicone as they will reproduce the exact dimensions of the original. To reproduce large castings with high dimensional stability, we'd highly recommend adding dry fillers up to a 100% by volume to their casting resin to reduce the shrinkage of the casting resins providing a more accurage reproduction. Adding dry fillers will reduce the shrink but not completely negate it.
