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Link to PART 2 - Casting the Urethane Part: • Great Video: Casting a Part With Poly... Making a 2-Part silicone mold is an essential skill to learn for casting polyurethanes. Using simple methods developed over several decades in Rapid Prototyping, learn how to make a silicone mold that produces high quality parts. For 40 years, BJB Enterprises, Inc., an ISO 9001:2008 Company, has been in the business of formulating and supplying quality liquid resin systems to a vast array of industries and with a myriad of applications in mind! BJB offers a complete line-up of Castable Polyurethanes, Epoxy Systems, Silicone Casting Rubbers, Polyurethane Foam Systems, Aliphatic Water Clear Urethanes, Sprayable Polyurethanes, Pigments and Release. Be sure to visit our website: www.BJBEnterprises.com 0:00 Introduction 0:47 Rigid Plastics 0:52 Rigid & Flexible Foams 1:08 Two Part Silicone Mold 1:55 Primed and painted with clear auto paint. 3:25 Double-Sided Tape 4:28 Cut Thin Strips of Tape 4:33 Apply Thin Perimeter 4:39 Measure & Mark Master 4:49 Peel Off Backing & Place On Splitter 5:10 Fill with Modeling Clay & trim with Shaping Tool 5:46 Feathered Edge 6:04 Demold clean part simulating an injection molded part 6:17 Styrene Sheet 6:32 Fasten with glue or tape 6:51 Pre-Molded Keys 7:57 Building Blocks 8:02 Large Diameter Pipe 8:14 Silicone can form a mechanical lock on rough surfaces 8:22 ABS Plastic Sheet 8:50 Making walls too thin can cause distortion 9:02 Mold box with clamps incorporated 9:11 Hot Glue to Splitter Board 9:37 Tin Catalyzed (condensation cured) 10:12 Sulphur Containing Clays 10:27 Run Small Test on Unknown Surfaces 12:25 Use a mixing container with plenty of room for expansion. 13:14 Continue pulling vacuum for several minutes. 14:39 Aerosol Spray creates a texture 15:38 Plastic Rod 15:53 Provide Make-Up material from shrinkage. 16:24 Vent Risers 16:51 Risers decrease wear on the mold 17:14 Equipment Injection 17:32 Placement of fill port & vents is a critical detail.