Making Molds With Silicone Rubber

I have been doing clay modeling for many years. I was quite happy making large and small figurines with clay, and they turned out quite clearly detailed and appealing. However, recently I came across many mold makers who were  (to many “quite” in a row) enthusiastic about silicone rubber and how it can be used to reproduce almost anything.

I wanted to try out the product and looked up the instructions on the EnvironMolds website The illustrated directions were clear which further motivated me to give it a try. I ordered MoldRite 25 silicone for my task and it was delivered shortly.

I decided to make a mold of a small figurine that I had already fashioned with clay. I used a cup for the mold box and glued the model on the bottom. Then I had to accurately weigh and thoroughly mix the silicone rubber and catalyst in a bowl. Pouring the mixture in a high, thin stream into the cup helped me to avoid most of the air bubbles. I covered the figurine completely with silicone rubber and pricked the few air bubbles that rose to the surface. 
The silicone mold had set properly within a few hours and I demolded it to get the silicone rubber mold with all the indentations and undercuts captured perfectly. After that I used the same silicone mold to make many more figurines and each turned out absolutely identical to the original one. The process was easy and fun too!

Mold Making Materials at EnvironMolds

EnvironMolds provides access to a complete array of products for making various types of molds.

Clay may seem like a simple material but the high-quality, oil-based plasticine variant proves to be excellent for making molds, sculptures, masks, animation figures and even special effects. Then there are carving and casting waxes that are especially suitable for making candles and soaps.


If you are interested in capturing the shape of the human body for life casting, just turn towards the skin-safe alginates section. There is a silica-free formulation for use on babies and enhanced alginates for larger molds. Even plaster bandages can be used to make form molds from the body or other objects that do not have many details. The same bandages are also useful for reinforcing alginate molds.

Polyurethane rubbers are an exceptional mold making system especially when tough and durable molds are required, such as for concrete casting. The high quality silicone rubber formulas are suitable for any kind of application. Silicone rubber options are available for making food molds, translucent skin surfaces and even for making body molds. Liquid latex rubber is another versatile compound that is economical as well. It is primarily used for creating special effects on artists and for making masks.


Moulage and thermoset mold rubbers need to heated prior to use. The major benefit is that these mold making compounds are reusable by melting.

In case you want to know more about how to make molds, also hosts a learning centre with books, DVDs and other learning aids.