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mold mate the making of a rubber mold 1

Posted on 2012-06-08, By A-Best Staff



To start making a rubber mold you will need a mold frame. They are available in different thicknesses and configurations. Some are available to make 1 mold, 2 molds  or 4 molds.


If you buy mold frames or already have one make sure you have a relief hole on each side. If you don't have holes on either side drill thorough with a 1/8" drill. When packing your master model make sure you have at least 1/4" thickness below the model and at least 1/4" thickness above the master master model. There are different types of rubber some are harder and some are softer. For a complicated master model use a softer rubber.


For a plain flat master model use a hard rubber. If you are a beginner and need to know how much rubber to use here is a simple trick. Fill a mold frame full with rubber (without a master model) and vulcanize.


When finished trim with scissors and weight on a scale. Write the weight on the mold (keep as a permanent record). Now you know how much rubber you need for this frame. You can now use different size pieces and some scrap, as long as the weight is the same or more (you must use all the pieces even if it looks over packed). With experience you will know just how much rubber to use.


Packing the master model....Take 3 or 4 pieces of pre-cut rubber peel off all paper from rubber except the bottom. Make sure your hands are clean put in rubber mold frame. Place master model on top and trace around ring with a pencil. With a surgical blade cut out 1 layer of rubber. Place ring back in rubber mold pushing down gently. If you push too hard you will distort the master model. Then you have to fill all the voids around the ring.


Roll a strip of rubber into a coil and fill center of ring. With a rounded tip tool push strips or small pieces of rubber into all the openings. Be very careful not to scratch the master model because it will come out on every wax pattern.


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