POM (Polyoxymethylene), also known as acetal or polyacetal, is a high-performance engineering thermoplastic valued for its excellent mechanical properties, including high stiffness, low friction, and good dimensional stability. As a POM extruded parts supplier, we understand the importance of proper storage to maintain the quality and performance of these parts. In this blog, we will discuss the key factors and best practices for storing POM extruded parts correctly.
1. Understanding the Characteristics of POM Materials
Before delving into storage methods, it's essential to have a basic understanding of POM materials. POM has a semi - crystalline structure, which gives it its unique physical and mechanical properties. However, it is also sensitive to certain environmental factors, such as temperature, humidity, and chemical exposure.
- Temperature Sensitivity: POM has a relatively low melting point compared to some other engineering plastics. The melting point of POM typically ranges from 165 - 175°C. Exposure to high temperatures can cause the material to soften, deform, or even degrade, leading to a loss of its mechanical properties.
- Humidity and Moisture Absorption: Although POM has low moisture absorption compared to some other polymers like Nylon Extruded Parts, it can still absorb a small amount of moisture over time. Excessive moisture can affect the dimensional stability of the parts and may also lead to surface defects or a reduction in mechanical strength.
- Chemical Resistance: POM has good resistance to many chemicals, but it can be attacked by strong acids, alkalis, and some solvents. Contact with these substances during storage can cause chemical degradation of the material.
2. Temperature Control in Storage
Maintaining a stable and appropriate temperature is crucial for storing POM extruded parts.
- Optimal Temperature Range: The ideal storage temperature for POM extruded parts is between 20 - 25°C. This range helps to preserve the material's mechanical properties and dimensional stability. Avoid storing the parts in areas where the temperature fluctuates significantly, such as near heating or cooling vents, direct sunlight, or in uninsulated storage facilities.
- High - Temperature Risks: If the storage temperature exceeds 50°C for an extended period, POM parts may start to soften and lose their shape. In extreme cases, the material can degrade, leading to a decrease in strength and hardness. Therefore, it is important to monitor the storage temperature regularly and take appropriate measures to keep it within the recommended range.
- Low - Temperature Effects: While POM is relatively resistant to low temperatures, extremely cold conditions can make the material more brittle. If the parts need to be stored in cold environments, it is advisable to use proper insulation or heating systems to prevent the temperature from dropping too low.
3. Humidity Management
Controlling humidity is another important aspect of storing POM extruded parts.
- Recommended Humidity Level: The relative humidity in the storage area should be maintained between 40 - 60%. This level helps to prevent excessive moisture absorption by the POM parts. High humidity can cause the parts to swell slightly, affecting their dimensional accuracy. In addition, moisture can promote the growth of mold and mildew on the surface of the parts, which can not only damage the appearance but also potentially affect the material's performance.
- Use of Desiccants: In areas with high humidity, it is a good practice to use desiccants in the storage containers. Silica gel is a commonly used desiccant that can effectively absorb moisture from the air. Place the desiccant packets in the storage boxes or containers along with the POM extruded parts and replace them regularly to ensure their effectiveness.
- Ventilation: Proper ventilation in the storage area is also important to prevent the accumulation of moisture. Ensure that the storage facility has adequate air circulation to remove any humid air and maintain a dry environment.
4. Protection from Chemicals and Contaminants
POM extruded parts should be protected from exposure to chemicals and contaminants during storage.
- Avoid Chemical Contact: Keep the parts away from chemicals such as strong acids, alkalis, and organic solvents. These substances can react with POM and cause chemical degradation, which may lead to a loss of mechanical properties and surface damage. If there is a possibility of chemical exposure in the storage area, use protective barriers or store the parts in a separate, well - ventilated area.
- Clean Storage Environment: Ensure that the storage area is clean and free from dust, dirt, and other contaminants. Contaminants can scratch the surface of the POM parts, which may affect their appearance and performance. Use clean storage containers and racks to store the parts, and clean the storage area regularly.
5. Proper Packaging
Appropriate packaging is essential for protecting POM extruded parts during storage.
- Use of Protective Films: For small POM parts, use protective films or bags to prevent scratches and damage. The protective films should be made of materials that are compatible with POM and do not leave any residues on the surface.
- Custom - Made Packaging: For larger or more complex POM extruded parts, consider using custom - made packaging solutions. This may include foam inserts or custom - designed boxes to provide cushioning and support, preventing the parts from being damaged during handling and storage.
- Labeling: Clearly label the packaging with information such as the part name, part number, quantity, and storage instructions. This helps to ensure that the parts are stored correctly and can be easily identified when needed.
6. Storage Rack and Shelving
The choice of storage rack and shelving can also affect the quality of POM extruded parts.
- Material of Racks and Shelves: Use racks and shelves made of materials that are non - corrosive and do not react with POM. Stainless steel or powder - coated steel racks are good options as they are durable and resistant to rust and corrosion.
- Proper Loading: Ensure that the racks and shelves are properly loaded to prevent overloading. Overloading can cause the parts to deform or damage, especially if the parts are stacked in an improper way. Follow the recommended weight limits for the storage racks and shelving.
7. Regular Inspection
Regular inspection of the stored POM extruded parts is necessary to detect any potential issues early.
- Visual Inspection: Conduct visual inspections of the parts at regular intervals. Look for signs of damage, such as cracks, scratches, or deformations. Check for any signs of discoloration or chemical reaction, which may indicate exposure to contaminants or improper storage conditions.
- Dimensional Check: Periodically measure the dimensions of the parts to ensure that they are still within the specified tolerance. Any significant changes in dimensions may indicate problems such as moisture absorption or temperature - related effects.
Contact for Purchase and Consultation
At our company, we are committed to providing high - quality POM extruded parts and helping our customers with their storage and usage needs. If you are interested in purchasing POM extruded parts or have any questions about their storage or application, please feel free to contact us. We have a team of experienced professionals who can offer you personalized solutions and technical support.
In addition to POM extruded parts, we also supply other high - quality plastic extruded parts, such as PBT Extruded Parts and Polyurethane Extruded Parts. Each of these materials has its unique properties and applications, and we can help you choose the most suitable one for your specific requirements.
References
- “Engineering Plastics Handbook” by Michael B. A. Oldfield
- “Polymer Science and Engineering” by Charles L. McHenry
