Plastic blow molding is a manufacturing process used to create hollow plastic parts. One advantage is cost-efficiency for high volume production, as it enables rapid production of parts with uniform wall thickness and excellent surface finish. It’s also versatile, allowing for the creation of complex shapes. However, the initial setup and tooling costs can be high, making it less economical for small production runs.

Additionally, material choice is limited to those that can be blow molded, restricting design flexibility. While it offers strength and lightweight benefits, environmental concerns due to plastic use and the difficulty in recycling some molded products are notable disadvantages.

Low-density polyethylene (LDPE) is a thermoplastic made from the monomer ethylene. Its structure is characterized by a less compact and more branched chain than its counterpart, high-density polyethylene (HDPE), resulting in a less dense material. This branching prevents the chains from packing closely in a crystalline arrangement, thereby lowering the density. Typically, LDPE has a density range of 0.910-0.925 g/cm³. This material is predominantly LDPE by composition, meaning virtually 100% of the content is low-density polyethylene, apart from minor additives for stabilization, pigmentation, or performance enhancement. LDPE is widely used for manufacturing containers, dispensing bottles, wash bottles, tubing, plastic bags for computer components, and various molded laboratory equipment due to its flexibility, strength, and low reactivity.

Polypropylene, a type of plastic designated by the recycling symbol #5, is generally regarded as safe and phthalate-free. Phthalates are chemical compounds used to make plastics like PVC more flexible. They are linked to health concerns, including hormonal disruptions. Polypropylene, however, is commonly used in food containers, medical components, and textiles without the addition of phthalates. It's chosen for its stability, resistance to heat, and lack of need for plasticizers. While it’s important to check for specific additives in any plastic product, polypropylene itself does not naturally contain phthalates.