When it comes to the intricate art of jewelry casting, a lot more goes on behind the scenes than meets the eye. One such process that plays a vital role in creating those stunning pieces of jewelry is steam dewaxing. So, why is steam dewaxing used in jewelry casting? That’s exactly what we’re going to explore in this blog post.

Steam dewaxing is a crucial step in the jewelry casting process, ensuring that the final product is as flawless and exquisite as possible. It can seem a bit complex at first but don’t worry, we’ll break it down into simple, easy-to-understand terms. Grab a cup of coffee, sit back, and let’s delve into the fascinating world of steam dewaxing in jewelry casting.

Let’s start with our why is steam dewaxing used in jewelry casting blog!

What is Dewaxing Casting

Dewaxing casting, also known as lost-wax casting or investment casting, is a highly precise method of producing intricate pieces of jewelry. It’s a process that has been around for thousands of years, dating back to ancient civilizations. The term “dewaxing” refers to the stage where the wax model used to create the mold is removed or “lost,” hence the name.

The dewaxing casting process typically involves the following steps:

Wax Model Creation

First, a detailed wax model of the final piece is made. This can be done by hand or using a computer-aided design (CAD) program.


The wax model is then surrounded by a ceramic material, often called the investment. Once the investment hardens, it forms a mold of the wax model.


This is where the wax model is removed from the hardened investment, leaving behind a hollow mold. The wax can be removed in several ways, which we’ll discuss shortly.


Molten metal is poured into the hollow mold. Once the metal cools and solidifies, the investment is broken away, revealing the final piece of jewelry.

Types of Dewaxing Casting

There are several methods of dewaxing in the jewelry casting process, including steam dewaxing, autoclave dewaxing, and flash fire dewaxing.

Steam Dewaxing

This method uses steam to melt and remove the wax from the investment. The investment is placed in a steam dewaxer, where the heat and pressure of the steam cause the wax to melt and flow out of the mold. 

This is an efficient and environmentally friendly method, as the wax can be collected and reused. Steam dewaxing is popular due to its ability to preserve the finest details of the mold without causing any damage.

Autoclave Dewaxing

In this method, the investment is placed in an autoclave, which uses high-pressure steam to melt the wax. While this method is faster than steam dewaxing, it can sometimes lead to investment cracking due to the rapid temperature change.

Flash Fire Dewaxing

This involves placing the investment in a kiln and rapidly heating it to high temperatures. The sudden heat causes the wax to vaporize and burn out of the mold. This method is quick but can result in a loss of fine details in the design.

Why is Steam Dewaxing Used in Jewelry Casting?

Steam dewaxing is a critical process in jewelry casting, particularly for its efficiency and precision. Let’s delve into why this method is so popular.

Firstly, steam dewaxing is a reliable way to preserve the intricate details of the jewelry design. When making jewelry through the lost-wax casting, one must ensure that the original wax model’s intricate patterns and delicate features are accurately transferred to the final metal piece. 

Steam dewaxing allows for this meticulous preservation. The low-intensity, uniform steam heat gently melts the wax, ensuring the mold’s fine details are not damaged or distorted.

Secondly, steam dewaxing is an environmentally friendly method. Unlike some other methods where the wax is burnt off, resulting in fumes and residue, steam dewaxing simply melts the wax, allowing it to be collected, recycled, and reused. This means less waste, less environmental impact, and more cost savings for the jeweler.

Moreover, steam dewaxing is a safer process for the jeweler. The method requires a steam dewaxing chamber, a machine with water basin under a wire or metal mesh, and a heating element. The invested flasks containing the wax models are placed in the chamber, and steam is generated to melt the wax. 

The melted wax collects in water reservoirs beneath the flasks for easy clean-up. This setup minimizes the risk of burns or accidents directly handling hot, molten wax.

Finally, steam dewaxing is versatile and can be adapted to small-scale and large-scale production. Steam dewaxing can accommodate varying production volumes, whether a jeweler is creating a single, unique piece or mass-producing a design.

How to Do Steam Dewaxing Jewelry Casting

Here’s a step-by-step guide on how to do steam dewaxing in jewelry casting:

Step 1: Create the Wax Model 

The first step in jewelry casting is to create a detailed wax model of the piece you want to cast. This model will be used to create the mold for your final piece.

Step 2: Investment 

Next, you’ll need to surround the wax model with a ceramic material called investment. Once the investment hardens, it forms a mold of the wax model.

Step 3: Prepare for Steam Dewaxing 

Before starting the dewaxing process, ensure the steam dewaxing chamber is ready. This chamber typically includes a water basin under a wire or metal mesh and a heating element.

Step 4: Steam Dewaxing 

Place the invested flasks containing the wax models in the chamber. The machine generates steam that heats the flask and melts the wax. The melted wax then trickles down and collects in water reservoirs beneath the flasks.

Step 5: Clean-Up 

Once the wax has been completely melted and removed from the investment, you can collect the liquid wax from the water reservoirs for reuse. This leaves you with a clean, wax-free mold.

Step 6: Casting 

Now that the wax has been removed, you’re left with a perfect mold of your piece. Pour molten metal into this mold. Once the metal cools and solidifies, you can break away the investment to reveal your final piece of jewelry.

Remember, steam dewaxing is a process that requires careful handling to ensure safety and to preserve the fine details of the jewelry design. Always follow safety guidelines, use the right equipment, and take time.

The Bottom Line

That’s a wrap from our why is steam dewaxing used in jewelry casting blog. Steam dewaxing is integral to the jewelry casting process due to its precision, efficiency, environmental friendliness, safety, and versatility. It ensures the preservation of intricate design details in the final metal piece, reducing waste by allowing for wax collection and reuse. 

Moreover, it offers a safer method for jewelers, minimizing risks associated with handling hot, molten wax directly. Whether you’re a jeweler creating a single piece or mass-producing a design, steam dewaxing can meet various production volumes, making it a preferred choice in jewelry casting.