Silicone molds can help you replicate any object you want. Before that, you need to learn how to make a silicone mold, which will be a creative and fulfilling process! This article will give you the most detailed explanation and steps to help you achieve this process. Now, continue to read on!
1. Prepare All the Items You Need
- The prototype(master model).The original item you want to copy.
- Liquid silicone. The mixture of liquid silica gel and corn starch will have a better effect.
- Mold box. This box is equivalent to a frame. Its main function is to frame the liquid silicone when it is poured onto the prototype. After the silicone has cured, you can take out the square silicone mold printed with the outline of the prototype object from the box.
- Mold release agent. Whether and how much mold release agent is needed depends on the material surface of the prototype. If the surface of the prototype is relatively rough, it will be much more difficult to demold, so more demolding agent should be prepared. If the surface of the prototype is smooth and fine, less or no mold release agent can be used.
- Hot melt glue gun. The function of the hot melt glue gun is to weld and fix the prototype item to the bottom of the mold box. In this way, when the liquid silicone is poured into the mold box, it can prevent the prototype items from being too light and floating around.
2. Determine the Type of Silicone Mold You Want to Make
There are mainly two types of silicone molds. One type is a one-piece silicone mold, and the other is a two-piece silicone mold (also known as a split mold). There is no distinction between good and bad between these two types of molds. The only differences lie in the products suitable for replication and the steps involved in making the molds. Before you make a silicone mold by yourself, you need to think clearly about which type you want to make.
- One-piece silicone mold.
One-piece silicone molds are only suitable for components with simple structures and flat surfaces. If the surface of your original has deep depressions or protrusions, it is not suitable for making an integrated mold. Otherwise, the finished silicone mold will be very difficult to demold. Although silicone is elastic, it is still possible to cause tearing when separating your silicone mold from the mold box. If what you are going to do is something with a simple structure, such as round small pendants or decorative items with smooth surface undulations, a one-piece silicone mold would better meet your requirements.
The manufacturing process of a one-piece silicone mold is relatively simpler. You just need to mix the silicone well, pour it into the mother mold, and wait for it to cure directly.
- Two-piece silicone mold
Split molds divide the mold cavity into two or more pieces, somewhat similar to the working principle of injection molding. Its core is to design the parting line. You need to cut along the most concealed position of the prototype item, such as the junction of two planes or the bottom of a depression. The mold is divided into two parts, forming a refillable 3D cavity. The advantage of doing this is that demolding is convenient. Even if your prototype has hooks or deep grooves, you can still separate the mold along the parting line and easily take out the prototype. Moreover, it is simpler for you to replicate the prototype using a split mold than an integrated one. It’s just that making split-type molds is a bit more troublesome.
If you are making a batch of objects with relatively three-dimensional surfaces, many grooves, and complex shapes, a split-type mold is more suitable. In addition, the split-type mold requires more splicing work. During pouring, it is necessary to ensure that the two molds fit tightly together.
In conclusion, you need to observe your prototype product first. Hold it in your hand and turn it around to see where there are protrusions and depressions. Imagine how to take it out after it solidifies. If all the protrusions can be easily detached from that one-piece structure in a certain direction, there will be no problem. If there are any stuck areas, it is necessary to choose a split type. If you spend an extra half an hour in front of the master mold observing and choosing the right type, the subsequent pouring and demolding will go much more smoothly.
In terms of operational difficulty, the one-piece type is more suitable for beginners who are making molds for the first time. The two-piece type requires an additional step of designing the parting line. If you are a beginner, it is recommended that you try making a one-piece silicone mold first.
3. The Steps for Making Silicone Molds
3.1 One-piece silicone mold:
- Get your prototype items ready. This original is the object you want to replicate. Its surface must be clean and free of oil stains. You can wipe it several times with an alcohol cotton pad to ensure there is no dust or grease residue. If you don’t have a prototype, you can use stereolithography resin (SLA) and print one with a 3D printer. For silicone molds that require accurate cavities, smooth surfaces, and stable dimensions, CNC machining is often used to produce mold inserts, prototype molds, and precision tooling components.
Next, handle the original surface. Spray a thin layer of mold release agent on the surface of your original mold. After spraying, let it dry for ten minutes. This step is to prepare for the subsequent demolding to prevent the silicone from sticking to the original mold and being unable to be removed. The mold release agent can be chosen as a spray or vaseline. Vaseline is viscous and easy to fix. Or a mixture of some wax and oil, or gel.
- Making mold boxes. Use coated medium-density fiberboard. Simple prefabricated plastic containers will also do. As long as the surface has no holes and the bottom is flat, it will be fine. To ensure a smooth demolding process, you can also apply a layer of mold release agent inside the mold box.
- Prepare silicone. You need to mix the liquid silica gel with corn starch in proportion as per the instructions. Then, use the stirring rod to stir slowly in one direction. If there are bubbles inside after mixing, you can let it stand for a period of time to allow the small bubbles to float naturally, or you can use a handheld electric sanding machine or other vibration devices to remove the bubbles.
- Pouring silicone. First, use a hot-melt glue gun to fix the prototype to the bottom of the mold box, leaving enough extra space around it to ensure that the silicone can fully cover your prototype when poured in. Then slowly pour in the silicone until it completely submerges your prototype. By the way, I still have one more thing to remind you of. Don’t choose a too small mold box. At least ensure that the thickness of the silicone after pouring is 1cm. Next, the mold box can be placed at room temperature to stand and cure. The curing time mainly depends on the type and brand of silicone, so it is also necessary to read the product manual. If you’re really not sure, just leave it alone for a day. One day is enough to solidify
- Silicone demolding. This should be a very simple step for you. Just peel the silicone out of the sealed box. Silicone is very elastic. Don’t worry. You won’t tear it.
- Replicate your prototype with other materials. After this silicone mold is completed, you can use it to replicate your prototype. Just pour the material you want to make into the prepared silicone mold, then let it dry, and the replication will be successful. Remember to spray some mold release agent on the surface of the mold as well. This way, it will be easier to demold. Now go and create boldly. This mold can be used many times.
3.2 Two-piece silicone mold:
Two-piece silicone molds are more troublesome to make. The two molds need to be made in two separate processes. The following are the detailed steps:
- Get your prototype items ready. (Refer to the production of integrated molds)
- Making mold boxes. (Refer to the production of integrated molds)
- Place the prototype and apply the mold release agent. (Refer to the production of integrated molds)
- Determine the parting line. Draw a smooth line on the original mold with a pencil, trying to avoid patterns, depression, or sharp areas (such as the base of the cup handle), and choose a smooth transition position (such as the connection between the cup body and the base). This line should be straight. When you draw it, you can compare it with a ruler to ensure that the two halves fit tightly after parting the mold.
- Choose another material, put it in the silicone mold box. In this article, I will take clay as an example. You place the clay inside the mold box and then put the prototype in. Let the clay submerge half of the prototype while exposing the other half.
- Pour the prepared silicone into the mold box. Now you can pour the silicone you have prepared into the box and completely cover the exposed half of the prototype. This layer of silicone will serve as half of the final mold.
- Remove half of the mold. After the silicone you poured in has cured, take the silicone mold, prototype, and clay out of the box. Clean up the dirt, and then your first silicone mold will be made.
- Put the mold and prototype back into the mold box. Clean the clay off the surface of half of the mold and the prototype that you have already made, and put them back into the mold box. This time, we need to change the direction of the prototype to facilitate the making of the next mold. I’m sure you can understand. Apply another layer of mold release agent on the surface of the prototype and the existing mold.
- Pour in the silicone. Just as before, slowly pour the silicone back into the mold box to fully cover the prototype. After the silicone above has solidified and formed again, you can obtain another silicone mold.
- Now you can use your two-piece mold to replicate the items you want.
One more tip: No matter what kind of mold it is, after it is made, try it out first. You can pour in cheap resin or gypsum to see if the mold removal is smooth. Adjust the parting line or add glue in time if there are any problems. Try several more times and your feel will get better and better.
Summary
The above is all the content I have shared about making silicone molds. If you have any other questions, you can contact us for free. We sell a wide variety of silicone products and can offer you more free and value-added services. Now go ahead and create boldly. Following the methods described in this article, you can use silicone molds to replicate all kinds of items you like.
FAQ
1. Silicone molds vs Injection molds vs 3D printing vs Polyurethane mold
- Silicone molds. It is suitable for small-batch production and is cheaper than the other two. If you want to make dozens of customized gifts, such as wedding souvenirs and figurine models, silicone molds are the most cost-effective. The cost is low. There is no need to open a metal mold. You can mix the glue by yourself and pour the mold. You can handle everything within one day, saving time, effort, and money.
- Injection molds. It is generally used for the mass production of products in industry. For instance, if you want to mass-produce a batch of mobile phone cases and auto parts, the efficiency of injection molds will be extremely high. However, mold making is very expensive, and making a mold once costs more than tens of thousands of yuan. Another point is that it also takes a relatively long time. If you want to produce a large quantity, it is very cost-effective to spread it out on each item.
- 3D printing. The advantage of 3D printing lies in its speed. You design a new thing and want to sample it first to see the effect. You just need to upload the model file, and the effect will be available within two or three hours. There is no need to wait for mold opening, which saves half a month of construction time. If complex structures are to be made, such as heat dissipation parts with spiral channels, 3D printing can directly produce them. If you are engaged in R&D and need to frequently modify designs, using 3D printing for mold testing is the most time-saving.
- Polyurethane mold. Polyurethane molds lie between silicone and injection molding. It has high hardness and wear resistance, and can produce hundreds more pieces than silicone. If you produce medium-volume products, the cost of using polyurethane is not much higher than that of silicone, but its lifespan is longer than that of silicone.
2. The Advantages and Disadvantages of Silicone Molds
Advantages:
- Silicone is durable and can be recycled multiple times. Even if it breaks, it can still be used after being patched with glue and has a very long service life.
- Silicone is an inorganic material. It is heat-resistant, cold-resistant, chemically resistant, and also resistant to fungi. Silicone molds can withstand a maximum temperature of 400 degrees Celsius and are widely used in various industries.
- Silicone is relatively soft. When forming parts with silicone molds, the parts are easy to remove. Moreover, silicone is very lightweight and convenient to carry.
Disadvantages:
- It is more expensive than latex and organic rubber. About a gallon of silicone regularly tops $100, almost twice as much as latex.
- Good silicone is a test for suppliers, and the quality on the market varies greatly. Here, I would like to recommend TOGOHK. This company has many years of experience in manufacturing silicone and has received unanimous praise from buyers.
3. The Silicone Mold Can be Used for What Kind of Scene
- Handicraft consumer goods.Soap, candles, erasers, toys, and collectibles, etc.
- The cultural and creative customization industry. Fridge magnets, keychains, and the like are quite popular in scenic spots.
- Jewelry industry.
- Film, television, and game props.
- The food industry. For example, cupcakes.
