Biaxially Oriented Polypropylene (BOPP) is a type of polypropylene film that has been stretched both mechanically in the machine direction (MD) and transversally in the amorphous region (TD) to improve its strength, clarity, and barrier properties. Due to its glossy surface, writing directly on BOPP materials can be challenging with regular pens or markers, as the ink may smear or not adhere well. However, using permanent markers or pens specifically designed for writing on glossy surfaces can yield better results. Pencils, ballpoint pens, and water-based inks typically don't work well. For applications requiring labeling or writing, it's often advisable to use labels that can adhere to the BOPP surface or to treat the surface (e.g., via corona treatment) to improve ink adhesion.

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Aluminum and polypropylene are materials with distinct characteristics, notably in their densities. Aluminum, a widely used metal in industries like aerospace and construction due to its strength and lightweight nature, has a density of approximately 2.7 g/cm³. This makes it heavier than many plastics but advantageous for its strength-to-weight ratio. On the other hand, polypropylene, a common plastic for containers and automotive parts, has a much lower density, around 0.90 g/cm³, making it lightweight and suitable for a range of products where a lesser weight is preferable. Choosing between aluminum and polypropylene largely depends on the application's requirements regarding weight, strength, and sustainability measures.