Polycarbonate Steam Polishing Process

Last Updated on October 12, 2023 by assistant

Vapor polishing is a technique that improves the surface finish of polycarbonate parts using chemical vapor deposition (CVD) of solvent onto the surface of the material. This technology simultaneously enhances the aesthetics and transparency of polycarbonate products. Ruitai is an expert in achieving high-quality polished surfaces on polycarbonate parts. In this article, we provide an overview of the polycarbonate vapor polishing process and the various advantages that vapor polishing offers to polycarbonate products. The following is an overview of the polycarbonate vapor polishing process.


Before starting the vapor polishing process, we thoroughly clean the polycarbonate parts to remove any dirt, debris, or contaminants that may interfere with the polishing process. This process is usually done using mild soap and water or a suitable cleaning solution.


Enter the polishing room

A complete polishing chamber is very important for processing polycarbonate parts. After cleaning the polycarbonate parts, place them in an enclosed polishing chamber designed for vapor polishing. The chamber is a controlled environment where the vapor polishing process takes place.

Solvent selection

Solvent selection is a very challenging aspect. Fortunately, Ruitai is an expert in this area. The appropriate solvent is selected based on its compatibility with the polycarbonate and its ability to dissolve the surface layer of the material. Common solvents used for polycarbonate vapor polishing include dichloromethane (DCM), methyl ethyl ketone (MEK), or a combination of these solvents.

Vapor deposition

The selected solvent is introduced into the polishing chamber in vapor form. The chamber is sealed to prevent steam from escaping and maintain a controlled environment. Steam fills the chamber and comes into contact with the surface of the polycarbonate part.

Smooth surface

When steam contacts the polycarbonate surface, it dissolves a thin layer of material, effectively smoothing out any blemishes, scratches, or rough areas. The dissolved material then re-coagulates on the surface, creating a smoother, more polished surface.

Polishing time

The duration of the vapor polishing process depends on the degree of surface improvement required and the thickness of the material being polished. Typically, this process can take anywhere from a few minutes to a few hours.

Post polishing

After the required polishing time, the polycarbonate part is removed from the polishing chamber. It is then rinsed and cleaned to remove any residual solvent. Allow parts to dry completely before further handling or use.

Vapor polishing offers multiple advantages for polycarbonate parts

Vapor polishing is by far the most suitable for PC materials and offers several advantages to polycarbonate parts. For example, here are some common solutions.

1. Improve surface finish
The process effectively eliminates surface imperfections, resulting in a smooth, polished appearance.

2. Enhance clarity
Vapor polishing can improve the clarity and definition of polycarbonate parts, making them more visually appealing.

3. Time and cost efficiency
Compared to other polishing methods, vapor polishing is a relatively fast and cost-effective solution for achieving a high-quality surface finish.

However, if you want to tackle the job of polycarbonate parts yourself, there are a few things to keep in mind when using the vapor polishing process:

Material Thickness: Vapor polishing mainly affects the surface layer of polycarbonate products. Thicker materials may require longer polishing times or additional processes to achieve the desired surface improvement. So may not be suitable for thick parts that require large amounts of material to be removed.

Safety Precautions: Vapor polishing often involves the use of solvents, which can be dangerous. Proper safety procedures must be followed, including working in a well-ventilated area and using appropriate personal protective equipment.

Part Geometry: The effectiveness of vapor polishing may vary depending on the complexity of the part geometry. Some intricate designs or hard-to-reach areas may be unevenly polished.

Material Compatibility: Vapor polishing is designed for polycarbonate and may not work with other types of plastics or materials. Compatibility testing should be performed to ensure that the solvent will not damage or degrade the polycarbonate.

Heat Sensitivity: Polycarbonate is heat sensitive and overheating can cause warping or deformation. Care should be taken to control the temperature during the steam polishing process to avoid prolonged exposure to high temperatures.

Among these precautions, safety issues are particularly important. For your health, we have the responsibility and obligation to provide you with some safety measures here.

What safety precautions should be followed during the vapor polishing process?

During the vapor polishing process, you must follow specific safety precautions to protect yourself and ensure a safe working environment. Here are some important security measures to consider:

Ventilation: Perform the steam polishing process in a well-ventilated area or under a fume hood to prevent the build-up of solvent vapors. Good ventilation helps disperse any potentially harmful smoke and maintains air quality. If working in an enclosed space, consider using local exhaust ventilation to further control vapor exposure.

Personal Protective Equipment (PPE): Wear appropriate personal protective equipment to protect yourself from potential hazards. Recommended personal protective equipment may include safety goggles or face shields, chemical-resistant gloves, aprons or lab coats, and closed-toed shoes. Specific PPE requirements may vary depending on the solvent selected and its associated hazards. Refer to the safety data sheet (SDS) of the solvent used to determine appropriate PPE.

Solvent Handling: Handle solvents used for vapor polishing carefully. Follow the manufacturer’s instructions and guidelines for safe handling, storage, and disposal of solvents. Store solvents in appropriately labeled containers in a well-ventilated dedicated storage area away from sources of ignition and incompatible materials.

Fire Safety: Solvents used in vapor polishing can be flammable. Keep all potential sources of ignition (such as open flames, sparks, and hot surfaces) away from the work area. Ensure that the vapor polishing chamber and surrounding environment are free of any potential sources of ignition. Have appropriate firefighting equipment in place to respond to emergencies.

Training and knowledge: Make sure the person performing the vapor polishing process is adequately trained on proper solvent handling, using equipment and understanding safety protocols. Become familiar with the hazards associated with the solvent you choose, including its flammability, toxicity, and reactivity. Stay informed about safety guidelines and best practices related to the specific vapor polishing process being used.


Emergency Response: Develop an emergency response plan in case of accidental spills, leaks, or exposure to solvents. Know the location of emergency showers, eyewash stations, fire extinguishers, and other safety equipment. Train personnel to take appropriate actions in an emergency, such as reporting the incident and seeking medical attention if necessary.

Waste Disposal: Follow proper procedures for disposing of solvent waste generated during vapor polishing. Dispose of waste materials in accordance with local regulations and guidelines. Avoid pouring solvents down the drain or disposing of them in regular trash cans.

Risk Assessment: Conduct a thorough risk assessment before starting the vapor polishing process. Identify potential hazards.

By following these safety precautions, you can mitigate potential risks associated with the vapor polishing process and ensure a safe working environment for yourself and others involved. Always prioritize safety and review relevant safety guidelines and regulations to ensure compliance.

If you want to know about other polishing methods, in this article, we give you some examples of common mold polishing technologies currently on the market. Steam polishing is an artistic processing technology, and different manufacturing levels will lead to differences in the visual effects of parts. In this regard, Ruitai is the leader with rich processing experience, so if you need polishing services, please contact us and we will provide you with a free quotation service.