Manufacturing - Tooling Solutions 
RTV Molding

Create complex and intricate molded parts by using a 3D printed form replacing the process of injection molding. 






3D Printing - Manufacturing-Tooling Solution - RTV Molding 


Room temperature vulcanization (RTV) molding, often referred to as resin casting or silicon molding, is an affordable solution for prototyping, functional testing, product demonstrations and short–run production. RTV molding offers lead times of three to seven days at well under the cost of machining or injection molding. The molds are made by pouring liquid silicone rubber over a pattern. The resulting firm but flexible mold can reproduce extremely complex geometry and intricate detail with tight tolerances. The molding process uses urethane thermoset materials that are available with a vast array of mechanical, thermal and electrical properties. Due to the cycle time, cost per piece and tool life, silicone molding is ideal for applications producing 1 to 100 parts. However, since the tools are inexpensive and quickly made, creating multiple silicone rubber molds to produce more parts is a viable option.

How it works 

The traditional approach is to machine patterns for RTV molds. This method is expensive, requires lead times of one to two weeks and restricts the geometric complexity of the molded parts. Design changes to machined parts require substantial lead times. With 3D printing (also called additive manufacturing), silicone rubber molding is once again a competitive and attractive solution. PolyJet and FDM Technology each reduce the time, labor and cost of silicone molding. Also, 3D printing makes it possible to produce a prototype pattern for customer review, with a typical lead time of less than 24 hours.

The Proto3000 Advantage

Patterns 3D printed with PolyJet or FDM are a best fit for RTV molding when:

  1. The pattern is complex or intricate
  2. Challenging characteristics include thin walls or internal geometry
  3. Multiple duplicate RTV molds are required
  4. RTV rubber requires a high cure temperature
  5. Design changes are likely
  6. Patterns are large or bulky

Benefits of PolyJet and FDM patterns for RTV molding include:

  1. Lead times reduced by 50 to 80 percent
  2. Cost reduced by 40 to 75 percent
  3. Inert models that won’t inhibit curing
  4. Stable models that won’t distort with heat
  5. Durable models that can be used many times
  6. Optional dissolve–away internal cores

Contact the Proto3000 Services Team for further information on how we can help you with this solution. 
If you want to speak to a LIVE PERSON - CALL 1-888-88-PROTO (77686).


The Technology Used for Manufacturing - Tooling Solutions 

Fused Deposition Modeling (FDM) Technology 

Using FDM technology allows affordability and durability by printing concept models with production-grade thermoplastics. 
FDM 3D Printers are office friendly and they produce small models in hours and large models in days. The FDM printed models can be drilled, sanded and painted according to your preference to create a perfect finishing of your prototype. 


PolyJet 3D Printing Technology

As a 3D printing process, this technology produces amazingly realistic models. The printing technology builds accurate models by incorporating multiple materials into one automated part to create prototypes that look and feel like finished products. With fine details, smooth surfaces, rigid housings, soft-touch buttons, lettering, rubberlike seals and even clear components, your models can look the part at a trade show, a presentation or even during a sales pitch. 



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