Casting Concrete in Polyurethane vs. Silicone Rubber Molds
Here at Polytek, we often recommend the use of liquid polyurethane rubber to make molds for concrete casting (e.g., concrete tiles...
Tutorials
How to Prepare a Model When Making a Polyurethane Rubber Mold
A model, also called a “master”, should be prepared according to the model material & mold material.Models being used to make a pol...
Tek-Tip: Repairing Torn Rubber Molds
If a tear develops in your polyurethane rubber or silicone rubber mold, one of the following options may help to repa...
Tek-Tip: Top 10 Most Common Rubber Mold Making Fails
We’ve compiled a list detailing the most common reasons that rubber mold making projects go wrong (e.g, uncured materials, incompl...
Tek-Tip: Perform Platinum Silicone Test Cures
Out of the entire Polytek® product line-up, platinum-cured silicones (PlatSil® products) are most likely to suffer from cure inhibition...
Tek-Tip: Understanding Physical Property Specifications for Rubbers & Plastics
Our Product Catalog, Website, Technical Bulletins and Physical Property Bulletins are full of technical specifications. They...
How to Keep Your Mold Making or Casting Workshop Clean
When you work with liquid polyurethane and silicone mold rubber on a regular basis, you come to realize that spills can happen and...
Tek-Tip: Keep Metal Containers Clean & Reduce Rubber Waste
Pint and quart-sized metal containers are used to package some of our liquid mold rubbers. This packing option is used be...
A Selection Guide: Sealers & Release Agents for Mold Making & Casting
Many mold making and casting projects require the use of an appropriate sealer and/or release agent. In the rea...
How to Make a One-Piece Silicone Rubber Block Mold
This step-by-step mold making tutorial shows you how to make a simple, one-piece silicone block mold of a small, decorative object.&nbs...
Should I Use Polyurethane Mold Rubber or Silicone Mold Rubber?
You’re in the planning stages of your mold making project and you need to decide which rubber is more suitable for your process: polyur...
Mold Making: Mold Rubber Hardness
The hardness of rubber can be measured using Durometer Shore Hardness Scales [Figure 1]. Shore Hardness measures the resistance of a ma...