Choosing between plastic or metal springs for your engineering project will impact the outcome and lifespan of the final product. Metal springs are often the choice for high-temperature applications due to their better heat resilience. In contrast, plastic springs, prized for their resistance to corrosion, are more suitable for humid conditions or where the spring will be exposed to chemicals. Additionally, plastic springs are lighter than metal ones, which can be advantageous in situations where weight affects cost, like in transportation. However, metal springs can handle high-stress and high-load situations due to their robust nature. Balancing these factors with cost and environmental considerations will guide you to the optimal spring selection.

Material Composition and Manufacturing of Plastic and Metal Springs

Plastic springs are commonly composed of PE, PP, PVC, PA66, and ABS. The characteristics of these materials, which may include resistance to corrosion and a degree of flexibility, are tied to the manufacturing processes employed. Production methods like injection molding, blow molding, extrusion, and rotational molding are utilized to shape the springs accurately. The performance and safety of the springs are influenced by these production methods and the specific application requirements.

Typically, metal springs are made from materials such as steel, stainless steel, or copper alloys, attributing to their load-bearing capacity and bending properties. Stainless steel springs demonstrate strong resistance to corrosion, while copper springs have conductivity benefits. Depending on the spring design and properties of the base material, manufacturing processes such as cold coiling or hot coiling are used. For metals that are hard and brittle, hot coiling is often used to enhance ductility and prevent cracking. The material used in the springs, whether plastic or metal, is selected based on the application requirements and environmental conditions they will be subjected to.

Comparative Analysis of Physical and Chemical Properties

When deciding between plastic and metal springs, it's crucial to acknowledge the physical and chemical properties of each. Metal springs possess a high strength threshold. They can withstand high temperatures and mechanical loads while preserving their spring attributes. These characteristics render them suitable for use in machinery or environments needing resilience. However, it must be remembered that metal springs have a potential to corrode, particularly in aggressive environments or when exposed to corrosive substances. An example of this might be a maritime setting where regular contact with salt water occurs, which could lead to corrosion and deterioration of the metal spring's performance over time.

Conversely, plastic springs demonstrate resistance to both corrosion and chemicals, factors which could potentially result in an extended operational lifespan in certain situations. In addition, plastic springs possess inherent electrical insulation characteristics, a trait which lessens risk in scenarios where electrical conductance may be a factor. However, there are limitations to using plastic springs. They cannot bear extreme heat and are prone to deform under high temperatures. Furthermore, plastic springs typically offer less mechanical strength than metal springs. For a practical example, consider a scenario involving an engine compartment with high-temperature conditions. In such a situation, plastic springs may deform and fail to satisfy load requirements, making metal springs a more advantageous option in this context.

Therefore, a comprehensive understanding of specific application requirements is necessary for deciding the most suitable spring material.

Application Fields- Where Do They Fit Best?

Cost, Durability, and Environmental Impact Comparison

Manufacturing, maintenance, and usage costs differ between plastic and metal springs. More often, the production cost for steel springs is lower. But, in corrosion-intensive environments like marine settings, maintenance costs can decrease with the use of plastic springs, which are not prone to rust.

Durability when choosing between plastic and metal springs is influenced by the operating environment. For controlled indoor conditions, metal springs might have a longer use period. Their durability reduces in settings exposed to materials that lead to corrosion. Under these circumstances, the resistant nature of plastic springs against corrosion could offer extended use.

In discussing environmental impact, focus should be given to the disposal practices for these springs. Metal springs have recycling potential thus reducing waste. However, plastic springs face difficulties in the recycling process and often end up in disposal facilities. This suggests that spring material selection should factor in the entire lifecycle from production to disposal.


In essence, your choice of plastic or metal springs relies on your project's specific needs. With factors such as cost, durability, environmental factors, and required physical and chemical properties, the distinctions of plastic and metal springs have diverging implications. For instance, metal springs can provide high tensile strength and heat resistance, while plastic springs offer resistance to chemical corrosion and are usually less heavy. Knowing the differences between the characteristics of the two materials will ensure that your choice aligns with the project's needs. This understanding will assist in your decision-making process, helping you reach a suitable spring option for your design.