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Why Is Sigma Mixer The Preferred Choice For Medical-grade Liquid Silicone? | JCT Machinery

January 09, 2026

sigma mixer

Sigma mixer is a specialized device for mixing high-viscosity, paste-like materials. It consists of two opposing ∑-shaped blades that achieve uniform mixing through strong shearing and tumbling.

It is widely used in plastics and rubber, medical materials, sealants, and thermally conductive silicone, and is particularly suitable for mixing and homogenizing high-filler, high-viscosity systems.



Why is sigma mixer suirable for medical-grade liquid silicone?

  • 1. Medical-grade liquid silicone typically refers to:

  • Medical-grade RTV or two-component silicone

  • Silicone rubber formulas for medical devices

  • Medical-grade sealing/adhesive/encapsulating silicone (paste-like or paste-like systems)

  • 2. This type of silicone has the following characteristics:

  • High viscosity

  • Contains a high proportion of fillers (such as silica/functional powders)

  • Requires high uniformity and rheological properties

  • Needs degassing and stable temperature control

  • 3. Sigma mixer is designed to meet these requirements:

  • Strong shear and tumbling homogenization - excellent mixing effect for high-filler systems.

  • Double-blade counter-rotating - smooth material circulation and more thorough mixing.

  • Jacketed heating/cooling - controllable for temperature-sensitive materials.

  • Vacuum capability - strong degassing ability, suitable for medical materials.

  • Low speed and high torque - more suitable for viscous materials


sigma blade mixer

Applications of Sigma Mixer in Medical-grade Liquid Silicone Production Line
1. Raw material premixing and dispersion: Premixing silicone base material, fillers, plasticizers, etc.

2. High filler homogeneity: Ensuring complete dispersion of fillers such as silica and preventing agglomeration.

3. Degassing treatment: Removing air bubbles introduced during mixing under vacuum conditions, improving product density.

4. Temperature-controlled mixing: Temperature control through jacketed circulating media to prevent premature crosslinking caused by temperature rise.


Medical-grade Liquid Silicone Sigma Mixer Design 
• Stainless steel 304/316L inner liner

• Mirror-polished inner wall (Ra≤0.8μm or higher)

• No dead corners (easy to clean)

• CIP/SIP cleaning support

sigma mixer blade


We offer complete production line solutions for sigma mixer used in the procution of medical-grade liquid silicone. It features efficient mixing, homogenization and degassing, and precise temperature control, making it suitable for the preparation and scale-up production of medical-grade RTV/two-compoent silicone materials.

If you have interest, feel free to contact us: +86-18138373963 (Whatsapp, Wechat) or contact@jctmixing.com.

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