Posts Tagged ‘Making’
Types of RTV Mold Rubber for Mold Making and Casting, Pros & Cons
Posted by admin in Mold Sunday, 6 November 2011 16:47 11 Comments
www.smooth-on.com to see more video tutorials and image galleries. Examining the different types of RTV mold rubber available for mold making and casting from Smooth-On. Advantages of Latex * Least expensive mold rubber available. * Very elastic, thin-walled and strong. * Lasts a long time. * Offers good abrasion resistance. * Good for making glove molds. Disadvantages of Latex * Strong ammonia smell. * Can only be brushed onto an original. * Many coats are necessary. * Can take up to two weeks to make mold. * Shrinkage. Casting with Latex * Good for casting concrete, wax or plaster. * Generally not used for casting urethane, polyester, or epoxy resins, or low-temp metal alloys. Advantages of Polysulfide * Soft, stretchy, and durable. * Last a very long time. * Moderate cost. * Will cure against water clay or clays containing sulfur. Disadvantages of Polysulfide * Accurate gram scale to weigh components. * Offensive odor. * May stain white plaster during casting. Casting with Polysulfide * Good for casting plaster or wax only. * Will not handle concrete, resins, or low-temp metal alloys. Advantages of Silicone Rubber * Best release properties of all the mold rubbers. * Model surface preparation minimal nor not necessary. * Release agent for casting often not necessary. * Most heat resistance to high temperatures. * Can cast low-tempmetal alloys such as tin and pewter. * High tear resistance. * Knotty tear propagation. * Very good chemical resistance. * Longest mold life …
Mold Making: Platsil Gel-10 Lifecast
Posted by admin in Mold Saturday, 29 October 2011 16:46 25 Comments
Full head cast done with Platsil Gel-10. This is merely an overview of the process. I skip over some of the basic steps that are the same with alginate. This is a fairly ambitious process so start small and get the hang of the materials before you try a full head. FXman, the “important” was just for you. Thought you might like to see it as well as hear it. Here’s my latest blog entry on the subject: brickintheyard.blogspot.com Thanks to Patrick (Zigor), Leann, and James.
RTV Mold Making
Posted by admin in Mold Thursday, 13 October 2011 16:48 No Comments
Silicone mold making tutorial. How to use silicone. The basics of pouring RTV silicone, as used in art.
Making the Cope * The Casting Process * Craft & Design / Product Design
Posted by admin in Mold Removal Wednesday, 5 October 2011 16:50 No Comments
Image taken on 2009-11-13 15:18:25 by Jordanhill School D&T Dept.