How to Choose Raw Materials for Making PU Tubing

Polyurethane (PU) tubing has become a preferred choice for many industries due to its durable, flexible, and chemical-resistant properties. When it comes to manufacturing PU tubing, choosing the right raw materials is crucial. The quality and characteristics of the raw materials directly impact the final product's performance and longevity. Here are some key factors to consider when selecting raw materials for making PU tubing:

1. Polymer Type:
The first step is to decide on the type of polymer to use for PU tubing production. There are two main types to consider: polyester-based PU and polyether-based PU. Polyester-based PU offers excellent resistance to abrasion and oil, making it suitable for applications involving exposure to harsh environments and heavy machinery. On the other hand, polyether-based PU provides better hydrolytic stability and is ideal for medical, food processing, and water-related industries.

2. Hardness and Flexibility:
The hardness and flexibility of PU tubing can be adjusted by varying the raw materials' composition. The softness or hardness of the tubing is measured by its durometer rating. Determining the required durometer is crucial based on the application and the specific environment it will be used in. For instance, a relatively harder PU tubing is suitable for applications that require increased resistance to abrasion, while a softer tubing is advantageous when flexibility is crucial.

3. Chemical Resistance:
PU tubing may come into contact with a variety of chemicals or fluids depending on the application. It is essential to choose raw materials that exhibit excellent chemical resistance to avoid degradation, swelling, or loss of mechanical properties. Consider the chemicals or fluids that will flow through the tubing and select raw materials accordingly.

4. Temperature Resistance:
The temperature range of the application environment plays a vital role in material selection. PU tubing should maintain its physical properties within the operating temperature range. Higher temperature resistance is usually achieved through the addition of specific additives or by selecting raw materials that inherently possess better resistance to heat.

5. Manufacturing Process:
Consider the manufacturing process involved in producing PU tubing. Some raw materials may be better suited for particular manufacturing techniques such as extrusion, injection molding, or blow molding. Ensure that the selected raw materials can be easily processed using the chosen manufacturing method to achieve consistent and high-quality PU tubing.

6. Compliance with Standards and Regulations:
Depending on the industry and specific application, PU tubing may need to comply with certain standards and regulations, such as those related to food contact, medical devices, or electrical safety. It is crucial to choose raw materials that meet the relevant standards and have the required certifications to ensure product safety and compliance.