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Known as the "workhorse" because it is more affordable and resistant to inhibition.
Watch out: It is susceptible to —if it touches sulfur (found in some clays), latex, or certain 3D prints, it may stay gooey and never harden. buy silicone for mold making
Generally considered the "gold standard" for its extreme dimensional accuracy and longevity . It has virtually zero shrinkage (around 0.04%) and can last for decades. Known as the "workhorse" because it is more
Hardness is measured on the . Lower numbers are softer and more flexible: Mold Making and Casting Products by Category - Smooth-On or certain 3D prints