What kind of wax is used in lost wax casting

Update:13 Apr 2020

One of the methods we use to manufacture our parts is c […]

One of the methods we use to manufacture our parts is called "lost wax investment casting". Archaeologists have found that lost wax casting is used in component manufacturing, which is considered to be one of the oldest manufacturing processes.

Lost wax investment castings can be easily adapted to the latest technologies due to their versatility and simplicity. Depending on the talent of the component manufacturer and the quality of the wax, mold and metal, jewelry can be very complex and delicate.

Given the wide range of techniques used to create wax models, several waxes can be used in the casting of lost wax jewelry, and each wax is suitable for a different design need. Read on to learn more about the basics of wax and the art of investment casting.

Wax type

There are mainly three types of wax used for lost wax precision casting: natural wax, synthetic wax, and special wax. Each has its own strengths and weaknesses.

Natural wax

Natural wax beeswax is an aromatic, soft, soft, sticky wax produced by bees. As it is a natural wax, its melting point and hardness may change. Other factors in the melting point of beeswax include pollen and pollen type. Beeswax typically has a melting point of 142 ° F to 150 ° F, so many lost wax investment casting manufacturers prefer to use it as it helps reduce shrinkage and deficiency.

Beeswax can also be used as a finish on ironware, steel and bronze. Prevents rust and gives the work a beautiful sheen. A mixture of beeswax, linseed oil and mineral oil can be gently polished to a metal.

Synthetic wax

There are two main types of synthetic waxes: microcrystalline wax and paraffin wax. Microcrystalline wax is soft and slightly tacky. It is moderately soft and has a smaller crystal structure than beeswax or paraffin. Derived from petroleum, this is one of the most popular waxes used in casting lost wax casting parts. Its melting point is about 160 ° F, which is one of the highest melting points on this list.

Paraffin wax is a white smooth hard wax with a large crystal structure. It is also derived from petroleum and is often used in candles. While not ideal for handmade parts, they can be used as additives in other waxes to make them harder. Many custom lost wax casting manufacturers use wax that melts at temperatures between 135 ° F and 140 ° F.

Lost wax jewelry casting special wax

There are several different special waxes, each specialized for a specific purpose. Each wax has a different hardness and melting point, so choosing the right wax requires expertise.

Wax engraving is very difficult and can be manually engraved using custom files, knives, scrapers, or power tools manufactured by a custom lost wax jewelry foundry. The melting point of engraving wax is very high because the hardness is between 225 ° F and 230 ° F.

Modeling waxes soften easily when exposed to heat from the hands and are used in sculpture and part modeling in a manner similar to working clay. There are too many ingredients in the production of modeling wax mixtures such as beeswax, paraffin or microcrystalline wax, rosin and fillers. This large change results in a wide range of melting points for modeling wax from 120 ° F to 160 ° F.

Viscose wax is a hard wax at first, but it becomes sticky when heated and completely melts when heated. Typically, viscous wax is used to connect a wax model (such as a gate or gate) to the wax model to provide temporary support. These tools are used by manufacturers to stabilize jewelry using lost wax cast jewelry, or to create a "tree" with multiple molds of the same model and remove the jewelry after casting to metal.

Repair wax and setting wax are not well known. Repair wax is a very soft wax used to fill small scratches on the complete model, and molded wax has a variety of pre-created shapes and hardnesses.