The difference between PE, PO, PP, PVC, OPP, CPE and ...

PE plastic bags are polymer organic compounds derived from the addition polymerization of ethylene. Polyethylene is globally recognized as the most suitable material for food contact due to its non-toxicity, odorlessness, and compliance with food packaging hygiene standards. The polyethylene film is lightweight and transparent with excellent properties such as moisture resistance, oxygen resistance, acid resistance, alkali resistance, decent air tightness, and remarkable heat sealability. It is one of the most widely utilized materials in plastic bags. The bag is soft, with low transparency relative to other materials but is highly tear-resistant and durable.

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PO plastic bags are blown from high-density polyethylene (HDPE), a non-toxic material with a wax-like feel. They exhibit excellent low-temperature resistance (usable down to -70°C to -100°C), strong chemical stability, and resistance to acid and alkali corrosion. However, they are sensitive to environmental stress, both chemical and mechanical, and are prone to poor heat aging. The bag has a brittle quality, not as transparent, thicker than PE, slightly white, and with moderate tensile strength.

PP plastic bags, commonly referred to as 100% off plastic, are made from polypropylene, a thermoplastic resin obtained by polymerizing propylene. Polypropylene can be categorized into isotactic, atactic, and syndiotactic configurations, with isotactic being notable for its high crystallinity, heat resistance, and solvent resistance. The bag is hard and clear but has poor tensile strength and is prone to bursting.

PVC plastic bags, made from polyvinyl chloride, include various additives to boost heat resistance, toughness, and flexibility. PVC is highly favored globally for its versatility. The bags can vary in hardness and transparency based on customer requirements, offering excellent durability and resistance to tearing. They are available in ultra-clear, standard, and frosted finishes.

Additional reading:
PE Film Design Guidance
When did they start making paper bags?
What are the benefits of using a 250g margarine tub OEM packaging machine?
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OPP plastic bags boast the highest transparency, creating a glossy, translucent appearance that increases product visibility and enhances product value. They are ideal for product packaging in various industries, including jewelry, stationery, toys, and clothing. However, they are the most brittle with high transparency but low tensile strength, making them prone to bursting.

CPE plastic bags are predominantly used in the electronics industry, for products like iPad tablets, iPhone mobile phones, and handheld consoles like the PSP. These bags present a matte and smooth finish on both sides, offering a higher-end and more luxurious packaging option.

PE vs. PP

Deciding between different types of plastics can be daunting since no two types of packaging are identical. Various plastic and poly materials serve distinct purposes. Here, we compare two common plastics - polyethylene (PE) vs. polypropylene (PP) - to highlight their key differences.

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