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Precise Cast Prototypes and Engineering

Published: 25 Sep, 2021

Rubber Plaster Mold Casting vs Investment Casting

6-minute read | Author: M.Hagaman

Comparisons and advantages when looking at Rubber Plaster Mold Casting vs Investment Casting.

Rubber Plaster Mold Casting

What is Rubber Mold Plaster Casting?

Also known as RPM Castings, Rubber Plaster Mold casting is a metal casting process in which rubber is used to produce a plaster tool, then the plaster is used as a “die.” This genius and intuitive process can get the same results achievable with Investment Casting at a much lower cost.

Investment Casting is a metal casting process in which wax is used as a mold or die. This form of metal casting is more expensive than Die Casting and No-Bake Sand Casting, which makes it not a great choice for low-volume manufacturing.

Only non-ferrous metals such as aluminum and zinc can be used with RPM castings, but each other those metals have great benefits in the casting process. Learn more about our Foundry capabilities or learn more alloys from our casting alloys chart. 

This method of metal casting is the most popular casting alternative because of its low tooling costs and fast turn times.

Rubber plaster mold casting is best for Low-volume productions- from 5- 1,000 units per month.

Investment Casting

Alternatives to Investment Casting

When companies are looking for short-run, low-volume, or prototype parts, it makes more fiscal sense to select a casting process that has lower up-front costs.

When comparing Rubber Plaster Mold Casting vs Investment Casting there are several factors to consider:

What is the Lead time for Rubber Mold Castings?

Short lead times. Can be done in a matter of days. Want to know the lead time for your parts?  Get a free quote, it takes 2-5 minutes to complete 

What is the Tooling Cost for Rubber Mold Castings?

Justifying the cost of tooling is a major reason to select investment casting alternatives. Selecting your tooling option needs to meet the needs of how long that product is going to be in production and the volume of the manufacturing.

If a medical device is a short-run production or low-volume manufacturing, justifying die casts or investment cast costs are not the best choices and die-cast or investment cast alternatives like Rubber plaster mold casting or Sand castings are perfect options that can produce similar results.

Production Cost difference

It is substantially less to use rubber plaster mold casting vs investment casting.

Geometric shapes – Design freedom. RPM can be used to create more difficult shapes and can show detail as fine as a fingerprint.  Thin walls as .030” or .7mm wall thickness.

Surface Finish Capabilities for Rubber Plaster Mold Castings– 63 RMS surface finish and down to .080”. Very similar to Die Cast surface.

Companies that benefit from Rubber plaster mold castings are aerospace, medical, and defense.

Rubber Plaster Mold Casting vs Investment Casting

Advantages of Rubber Plaster Mold Casting vs Investment casting.

1. Cost is the biggest advantage of using this casting method. As discussed in this article. The lower tooling costs and lower upfront cost than die casting.

Using Rubber Plaster Mold Castings can help prevent financial setbacks and won’t drain cash from your company.

2. Surface Finish. Precise Cast can obtain a 63 RMS surface finish very similar to a die-cast surface.

3. Fast – With faster lead and turn times, you can get your products to market faster than with other casting methods.




Selecting a Metal Casting Company

Something to consider when selecting your manufacturing partner is how long the company has been in business. At Precise Cast, we have worked for top industry, Fortune 500 companies, for almost 30 years.

We built our foundry around our customer’s most demanding needs. Our central location near Denver, Colorado, gives us easy reach to all North America Markets.

Talk to our engineering experts about Plaster Mold Casting vs Investment casting to help make the best selection for your company. Get a metal casting quote now. 



Preicse Cast Prototpypes and Engineering

We are an American manufacturing company near Denver, CO. Our focus is Rapid Prototyping and Low-Volmue Manufacturing.

We specialize in aluminum, zinc, and magnesium metal castings. We also offer the newest technology in our in-house CNC machine shop.

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