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Custom-made Polyurethane RTV Rubber Molds
MORE CUSTOM-MADE MOLDS by MASTERLINE

CUSTOM SOAP MOLDS
CUSTOM CERAMIC MOLDS
CUSTOM CANDLE MOLDS
CUSTOM SILICONE MOLDS
CUSTOM LATEX MOLDS
CUSTOM DOLL MOLDS
CUSTOM GLASS SAGGARS
CUSTOM ARCHITECTURAL MOLDING & TILE
READY TO WORK SOAP MOLDS

Preparing the case mold by spraying a special polyurethane releasing agent.

Building a temporary box around the case mold and sealing the box with clay

Measure and mix the rubber ingredients carefully either by hand or mechanical mixer.

Pour the mixed rubber over the case mold.

Affix the model to a smooth clean dry surface. Carefully construct a tight case around the model.  Make sure that the model and case have been properly prepped and sprayed using the correct releasing agent.  Polyurethane RTV Rubber will stick tenaciously to anything that has not been properly sprayed with release.

The Polyurethane RTV Rubber comes in two parts.  Weigh each part correctly and accurately.  Mix by hand or mechanically means for 3 to 5 minutes or until thoroughly mixed in a super clean pail preferably plastic. After pouring the Polyurethane Rubber, allow the mixture to cure for 24 to 30 hours at room temperature before de-molding.

When making a rubber mold avoid contaminating the mixture with bits of clay and plaster chips, droplets of water, wood chips, etc.

The Polyurethane RTV Rubber molds are usually locked into a Hydro Stone or Fiberglass 'mother mold' which acts as a of base of support for the rubber.  Fiberglass bases may crack  over time.  The 'mother mold'  base will stabilize the rubber mold during casting, otherwise, distortion in the final product could occur.  This is particularly true when casting plaster, concrete, wax or soap items.

When not is use, store the rubber molds carefully on a flat surface to avoid warping and twisting in a cool, dry area and avoid directly contact with UV rays (direct sunlight). Silicone Molds are still by far the best mold material to use for all types of applications.  Polyurethane may be less expensive when first purchased, but remember, you get what you pay for.

To learn more about rubber moldmaking, and for information  link onto Moldmaking Rubber Courses.


For all your Custom Polyurethane Molds, Masterline honors these Credit Cards

 

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Tel: 905-452-8724
E-mail: masterlinemolds@rogers.com
This page was last updated on October 06, 2007