The Best Silicone Molding and Vacuum Casting In China

Vacuum casting is a rapid prototyping technology that allows the duplication of dozens of plastic parts (with the presence of the undercuts) from a master model. The parts obtained are suitable for assembly testing. This process uses the vacuum effect to inject the material into a silicone mold (hence the alternative names “silicone molding” and “vacuum casting”). The injected materials are polyurethanes whose Shore (hardness) can be adjusted. Therefore, unlike other technologies, it allows the creation of flexible parts.

The silicone molding requires a master model manufactured by 3D milling or printed by SLA. The mold then allows for perfect duplication.

Technical details of vacuum mold casting

The silicone molding first requires the manufacture of a master model by 3D machining or 3D printing. Once the master part is obtained, a silicone mold is created from it. The raw material is mixed and injected into this mold by suction in a vacuum bell jar. The cast part then hardens in an oven for 30 to 40 minutes before being removed from the mold. The silicone mold can be reused several times, which results in significant economies of scale from 10 parts, but it has a limited service life. This process allows the perfect duplication of the model part.


The parts obtained by vacuum casting are suitable for functional and visual testing. Indeed, the physical, mechanical, thermal and aesthetic qualities of the parts created are very similar to those of series injection parts. This is explained by a large number of available resins that offer a wide range of possibilities. We work in particular with the Axson and Heicast ranges. For example, the material can be transparent, can imitate a fiber reinforced, be of different hardnesses, or reproduce the properties of ABS, PMMA, PC, PE, PP, etc.. Finally, our workshop can apply various finishes, such as glossy finishing or soft touch and can simulate several applications such as overmolding of inserts.

The value of vacuum casting in China

The parts obtained by vacuum casting are visually and mechanically very similar to series injection parts. This technology is suitable for both rapid prototyping and low volume plastic parts production (fewer than 100 parts). The repeatability and speed of this process are indeed advantageous because only 5 to 7 days are needed to produce 30 to 50 functional prototypes. For more than a dozen parts, vacuum casting is generally more relevant than 3D printing and CNC machining.

To read more about vacuum casting, please find below articles:

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Comments (13)

  • Tiaan in Johannesburg Reply

    To whom it may concern

    I am interested in producing a line of original highly detailed three dimensional figures between 5 an 15cm in height. These will likely need to be produced in sub-assembly.
    1. Do you have experience in the duplication of figures of this kind?
    2. Are you able to facilitate post-production packaging and drop-shipment supply?
    3. Do you have an option for environmentally friendly (biodegradable) resin alternatives?


    20 September 2021 at 8 h 42 min
    • Prototech Reply

      Hello Tiaan,

      Thank you for your comment !
      We have done before duplication of figures before in vacuum casting.
      There are a few kind of resins available but so far no biodegradable option is available.
      We invite you to send you request via our contact or quotation form.

      Thank you,
      Prototech Team

      22 September 2021 at 4 h 16 min
  • philippe de coensel in belgium Reply

    most estimated
    im looking to produce large chess pieces with materials from recyceling
    i would like to create molds between 2 meters hight king,the queen 1.80 m,the knight 1.6 m,horse 1.5, tower 1.50 m and the soldier 1.20m
    empty inside so they can be filled with water /or sand ,the diameter depends on the stabilety recommendation

    would this vacuum proces be te one to follow ?or xould you recomend anything better
    frendly regards
    philippe de coensel
    molduastraat 5
    8820 torhout belgium

    15 November 2020 at 12 h 21 min
    • Prototech Reply

      Hello Philippe,

      Thank you for your comment.
      Unfortunately these parts would be two big to be produce by urethane casting, and also very expensive.

      Wish you success in your project.
      Prototech Team

      17 November 2020 at 3 h 28 min
  • Abdullahi Reply

    Hello, I will be glad if you can give me quote on 1550 cm cube of urethane casting. Thanks in advance

    11 November 2020 at 19 h 21 min
  • Chuck in Concord, CA USA Reply


    We have a large part we wish to quote for urethane casting.

    The dimensions are: X = 657mm, Y = 637mm, Z = 20.5mm And, it will be electroless copper and nickel plated.

    Can you urethane cast a part this large?

    If you would like to quote this part I will ask my manager for permission to send you an Non Disclosure Agreement to sign. And, I will send a link for you to upload the file.

    Thank you.

    9 August 2019 at 22 h 23 min
    • Prototech Reply

      Hello Chuck,

      Many thanks for your mail,

      I confirm we can produce such a large part by vacuum casting.

      Please send to our mails the NDA as well as the 3D files alongside your requirements that we can provide you a quote.

      The Prototech team

      12 August 2019 at 4 h 29 min
  • kevin Reply

    Hi, I would need about thirty prototypes with M3 insert on it; do you provide this application by silicone molding?

    26 January 2018 at 15 h 22 min
    • Prototech Reply

      Dear Kevin,

      Many thanks for your comment,

      We are capable of doing M3 inserts. Depending on the part; we can do this via silicone molding with special post processing or CNC machining.

      Looking forward to receive your mail,

      The Prototech Team

      29 January 2018 at 2 h 53 min
  • Younes Reply

    Could you provide half-transparent/translucent parts by vacuum casting production?

    24 January 2018 at 14 h 49 min
  • Franck H Reply

    Hello, could you confirm which material do you use for vacuum casted pieces? I would require to test the resistance of the material before proceed to order.

    23 January 2018 at 10 h 10 min
    • Prototech Reply

      Dear Frank,
      Many thanks for your comment,

      We offer a big selection of materials. For vacuum casted pieces, we offer the following plastics:
      PX 100, PX 118, PX 5211 (PX 521HT), PX 5212, PX 5210, PX 527, UPX 8400, PX 212 (UP 5690), PX 223HT, PX 2017, PX 220 (UP 4280), UR 2180, XU50, 8260. Concerning elastomers (EPDM), we can make different shores (hardness) ranging from 50-90. We would be delighted to find the right material for your project. If you send us a 3D file we can do so right away.

      Your Prototech Asia Team

      24 January 2018 at 2 h 25 min


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