What Are Plastic Caps Made of?

What are plastic caps made of?
Plastic bottle caps are typically made from high density polyethylene (PE-HD) or polypropylene (PP). These are hard materials that can withstand very high temperatures.

They are a very important part of many types of products, from bottles to pharmaceutical containers. They can serve as a closure device to keep the contents safe until they are ready to be opened and also can help prevent the contents from getting lost or tampered with while in storage.

The material used for bottle caps depends on the intended application and the environment in which they will be used. It is important to choose a material that will be recycled after its use.

Depending on the application, various additives are often used to tailor the properties of the plastic resin and its cap. These include processing and thermal stabilizers as well as antioxidants that can protect the polymer and its additives from degradation due to UV light.

Slip agent additives are commonly employed to promote the low coefficient of friction and adequate opening torque performance of caps. These additives can be formulated into PE-HD and PP resins to suit different bottle cap applications.

However, the chemical structures of common slip agent additives such as erucamide or behenamide are not clearly indicated in data sheets.