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Vacuum Casting or Injection Molding – We Help You Make the Choice with What We Know
by Nice Rapid | Feb 28,2021 | Vacuum Casting

Vacuum casting is a legacy manufacturing technique. This phrase, for the non-initiated, is just jargon for "outdated," it is not a technique so used these days. The industry's always shifting market has seen a rise of low-volume manufacturing projects that require specific methods we thought could be retired. But why would you use vacuum casting if you have injection molding with most workshops these days? We are glad you asked because we have some answers for you.

Vacuum casting begins with the creation of the master. The master can be created out of anything, but it should be built with materials that can withstand silicone curation properties. Something fragile will not do. The mater needs to go into silicone and then separated from it, creating the mold. The mold can take the continuous pouring of liquid silicone to make new copies of it. Vacuum casting is a procedure, when done right, offers a product with no air bubbles in less than half an hour.

Why Vacuum Casting is better than Injection Molding

Productions costs are the main issue here. Vacuum casting is an incredibly cheap way to get things done when you're dealing with short runs of product. The legacy technique can help you cast a hundred units of a product without having to fire up all your systems. This means a lot of saved money when it comes to side utilities such as power and labor. There is quite a list of benefits we can discuss, so let's get started on the more worthwhile ones.

It's all in the Details

This will sound a bit far-fetched, but it's a proven fact: vacuum casting allows for a great deal of detail to go into the mold. Take a moment to consider this: the master is usually made from a high-quality material that is very resistant to pressure. Silicone is one of the most malleable plastics out there. The plastic will fit the mold like a glove, mostly if the mold is made from metals.

Perfect Form

Vacuum casting can achieve something that injection molding can't: an excellent grade finish for your part's surface. We are not talking about something that will have to be sanded off or cut with machining tools. We are talking about one of the cleanest finishes you can achieve with your product without any additional tooling. The less complicated your design, the better, but even intricate designs have a great chance of coming off looking picture-perfect straight out of the mold.

It's Fast

The setup for a vacuum casting production cycle is incredibly fast. Once the master is finished, the production cycle, from mold creation to shipping, can be as low as two weeks, always factoring in the quantity of product required. Vacuum casting is suitable for low production runs, so 100 units are done faster with this manufacturing technique and with much less hassle than the whole setup for injection molding. 

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