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Known as the "workhorse" because it is more affordable and resistant to inhibition.

Hardness is measured on the . Lower numbers are softer and more flexible: Mold Making and Casting Products by Category - Smooth-On 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

Watch out: It has higher shrinkage (up to 1%) and a shorter "library life," often becoming brittle after 1–2 years. 2. Select the Right Hardness (Shore A) It has virtually zero shrinkage (around 0

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.

Best for: Beginners, large industrial molds, and masters that might contain sulfur or other contaminants.