Resin Degasser

TEL:18925129293

Polyurethane Defoaming Machine


Resolve Bubbles and Foaming in Polyurethane Casting and Potting · Dense Castings Free of Voids with Stable Performance

Simultaneous Mixing and Air Extraction Under Vacuum + Suppression of Abnormal Foaming + Efficient Completion Within Short Operating Window

SIENOX polyurethane defoaming solution addresses the tendency of air entrapment and slight foaming after mixing of PU potting adhesive, elastomer and casting compound. It carries out mixing and air extraction under negative pressure to control foaming and eliminate bubbles, producing PU castings with dense interior, smooth surface and stable mechanical properties.

✓ CE Certification  ✓ ISO9001 Quality System ✓ RoHS Compliance ✓ Custom Voltage Available (110V/220V)


Online Message Free Sample Testing Engineer Hotline: 189-2512-9293

Why Polyurethane Defoaming Machine Is Required

PU Potting & Encapsulation Industry

PU potting adhesives are widely used for cushioning and waterproofing of automotive wiring harnesses, sensors and power modules. Air trapped after mixing creates voids inside the potting layer, which degrade sealing and cushioning performance and may cause cracking and liquid ingress under vibration and temperature cycling.

Polyurethane Elastomer Industry

Internal voids in PU elastomers, rubber rollers and buffer castings significantly reduce strength, wear resistance and rebound consistency. The compactness of castings directly determines the mechanical properties of finished products.

PU Coating & Bonding Industry

PU coatings and structural adhesives feature high reactivity after mixing. Air entrapment together with slight foaming during stirring leads to pinholes and bubbles after curing, impairing coating protection and bonding strength.

✨ Traditional Dilemma: Air entrapment from manual stirring plus inherent reactive foaming of PU; curing starts if defoaming is delayed. Conventional vacuum chambers have slow pumping speed and cannot keep up with the operating window. Therefore, a vacuum mixing solution that enables simultaneous mixing and defoaming is required.

Why Choose SIENOX PU Defoaming Solution

Simultaneous Mixing and Defoaming

Synchronous mixing and defoaming under vacuum shortens the process, completing the operation within PU pot life to prevent material thickening and curing.

Foaming Control via Negative Pressure

Controllable vacuum suppresses abnormal foaming. Castings become denser after defoaming with consistent mechanical properties.

Stable & Low-noise Without Ratio Deviation

Low-vibration equipment with non-contact mixing, maintains the proportion of multi-component PU materials, no cross-contamination and stable mass production.

✨ The MIX60 integrates three core capabilities: deep vacuum defoaming, precision small sample processing, and reproducible process parameters. It is an ideal device for laboratory R&D requiring vacuum-assisted defoaming.

Equipment Supporting Description

SIENOX A/B adhesive defoaming solution can be combined with other equipment to form a complete potting process chain.

Supporting Process Chain of Equipment 

Material Preheating → Vacuum Mixing and Defoaming (Controlled Time / Vacuum Level) → Immediate Casting / Potting → Curing.

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Specifications & Parameters

Selection Guide

Polyurethane TypeTypical ViscosityRecommended Defoaming MethodRecommended Equipment
PU Potting Adhesive (Low-Medium Viscosity)1000-8000cPVacuum Defoaming / Vacuum MixingZK Series / MIX60
PU Elastomer Casting CompoundMedium-High ViscosityVacuum Mixing & DefoamingMIX80 / MIX1000plus
PU Coating / Structural AdhesiveLow-Medium ViscosityVacuum Mixing & DefoamingMIX Series
High-density Elastomer PartsHigh ViscosityVacuum Mixing + Pressurized Fine DefoamingMIX1000plus / RX Series

Our Partners

Trusted by leading industrial manufacturing clusters and advanced university laboratories worldwide

Partner Showcase

FAQ - Frequently Asked Questions

Answers to common questions about product performance and everyday process selection

  • What is the working principle of a centrifugal defoaming machine?

    Principle of centrifugal defoaming machine: The bubbles are released by the downward principle of gravity.

  • How is the after-sales service?

    The company has professional after-sales service personnel, 24-hour dedicated service, and one-on-one technical support to solve your worries.

  • Why choose SIENOX?

    There are many reasons for choosing SIENOX, and the following are some of the main reasons:

    1. Professionalism: Our team consists of a group of professional individuals with rich experience and knowledge in their respective fields. We not only understand industry trends and best practices, but also provide practical and feasible solutions.

    2. Service quality: We focus on customer needs and satisfaction, and are always committed to providing high-quality services. We not only respond quickly to customer needs, but also provide customized services according to their requirements.

    3. Reliability: We adhere to the principles of integrity and professionalism, always adhering to commitments and agreements. Our work methods and deliverables comply with industry standards and best practices, enabling our clients to trust us.

    4. Innovation: We continuously explore new methods and tools to provide better services and meet customer needs. We encourage innovation and experimentation, and are willing to accept challenges and change.

    5. Cost effectiveness: We provide cost-effective services that not only help customers save costs, but also improve efficiency and productivity. We always prioritize the interests of our customers and provide them with the best solutions.

    6. Teamwork: We believe in the power and value of teamwork, and our team members support, collaborate, and respect each other. We establish close cooperative relationships with customers, partners, and other stakeholders to achieve common goals.

    The above are just some of the reasons for choosing us. We believe there are many other advantages and values that can be provided to customers. If you are looking for a professional, reliable, and high-quality service provider, we look forward to working with you.


  • How does the stirring and defoaming machine work?

    The SIENOX stirring and defoaming machine performs defoaming through centrifugal force at revolution and stirring through shear force formed by revolution and rotation,

    Assisted by a vacuum pump to extract gas and achieve a vacuum state, removing nanoscale tiny bubbles. No contact with materials, no secondary pollution, and no secondary waste.

  • What is the function of a defoaming machine?

    A defoaming machine is a device used to remove bubbles from liquids. Its function is to assist in the liquid mixing, reaction, coating, printing, infusion and other process steps in the production process, avoiding the generation of bubbles and their impact on the final product. In many industrial and laboratory environments, removing bubbles is essential as they may have a negative impact on product quality, such as affecting surface tension and stability. Defoaming machines typically use various techniques such as vibration, ultrasound, centrifugation, etc. to achieve effective bubble removal. It has a wide range of applications, including but not limited to semiconductors, solar energy, optics, biotechnology, materials science, etc.

Technical Specification List

Full‑line standardized specifications for accurate process evaluation and equipment selection

Polyurethane TypeTypical ViscosityRecommended Defoaming MethodRecommended Equipment
PU Potting Adhesive (Low-Medium Viscosity)1000-8000cPVacuum Defoaming / Vacuum MixingZK Series / MIX60
PU Elastomer Casting CompoundMedium-High ViscosityVacuum Mixing & DefoamingMIX80 / MIX1000plus
PU Coating / Structural AdhesiveLow-Medium ViscosityVacuum Mixing & DefoamingMIX Series
High-density Elastomer PartsHigh ViscosityVacuum Mixing + Pressurized Fine DefoamingMIX1000plus / RX Series

Multi‑Industry Solutions

Covering stirring and debubbling applications of typical materials across six major industries

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PU Potting

Harness, Sensor, Power Module Cushioning & Waterproof Potting

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Elastomer Casting

Casting for Rubber Rollers, Buffers, Wear-resistant Parts

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Automotive Components

On-board Potting, Seals, Buffer Blocks

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PU Coatings

Anti-corrosion Coatings, Floor Paints, Waterproof Coatings

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Structural Bonding

PU Structural Adhesive, Sealant, Binder

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Footwear & Flexible Foam

PU Soles, Flexible Foams, Microcellular Elastomers

Comprehensive Equipment Operation Demo Videos

Gain intuitive, clear, dynamic insight into synchronous defoaming with planetary centrifugal force and high negative pressure.

Measured Defoaming‑Process Performance

Measured Processing Results for Six Typical Materials

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Paste Materials

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Adhesives + Powders

Polymer Materials.jpg

Polymer Materials

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Pharmaceutical Gels

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Silver Paste Materials

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Battery Slurries



Precautions for Use

PrecautionsOperating Instructions
Ratio & Material TemperatureStrictly control the ratio of multi-components and material temperature; preheat to reduce viscosity before defoaming when necessary.
Pot LifePU has high reactivity. Complete casting promptly after defoaming with compact operation to avoid thickening caused by expired pot life.
Vacuum LevelAdjust vacuum level and duration according to formulation to prevent abnormal foaming caused by excessive pumping.
Slow Pressure ReliefRelease pressure slowly before opening the lid after defoaming to prevent re-bubbling on the surface of casting compound.

* Internal laboratory test data. Actual results vary with material formulation and process. Contact sales for real customer cases.

Customer Delivery & Application Cases

Rooted in manufacturing frontlines, empowering benchmark production lines and key national research institutions across diverse industries.


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Stirring‑Defoaming Solution for Glue Materials in Consumer‑Electronics Industry


施诺斯真空脱泡搅拌机在胶粘剂中的解决方案.jpg

Vacuum Defoaming Solution for Consumer Electronics Adhesives


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Industrial University Solves Bubble Challenges of Coating‑Film Materials with SIENOX Defoaming Machine

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