PET, PP, PE: choose the right plastic for packaging
The three most common types of plastics for rigid packaging, but each serves a different function; choosing the wrong one will affect product quality and brand story.
PET, PP, and PE are the three thermoplastic families that dominate bottle, jar, tube, and film packaging on the market. PET is clear, lightweight, and has good gas barrier properties; PP is chemically inert and heat-resistant; PE is flexible and has good moisture barrier properties. You need to understand the characteristics of each type to choose correctly based on the contents, rather than simply following habits or cost.
- the bottle needs to showcase the product
- Heat-resistant cream jar and lid.
- moisture-proof soft tube
- film and plastic bags
- a green brand that has not yet used recycled materials
- the product requires very high oxygen barrier using single-layer PP or PE
When it comes to rigid packaging for cosmetics, pharmaceuticals, or food, most bottles, jars, tubes, and films on the market belong to one of three plastic families: PET, PP, or PE. From the outside, they may look similar. However, in terms of technical properties, each type serves a specific function, and choosing the wrong one will directly affect the quality of the product inside, printability, and the brand's sustainability story.
PET, PP, PE what are they
These three types of plastics are all thermoplastics, meaning they can be melted and shaped using molds. Each type is identified by a code engraved on the bottom of the packaging, according to ASTM D7611 standards established by SPI since 1988.
- PET (polyethylene terephthalate), code 1: Clear, lightweight material with a glossy surface. Provides good moisture barrier and moderate oxygen barrier for most common applications, no additional coating needed. Commonly used for drinking bottles, toner bottles, syrup bottles, juice containers. The amber version (brownish-yellow) protects light-sensitive products.
- PP (polypropylene), code 5: Moderately rigid, slightly opaque or milky clear, inert to acids, alkalis, alcohols, oils, and most organic solvents. Better heat resistance than PET. Moderate moisture barrier, but poor oxygen barrier. Commonly used for cream jars, screw caps, and heat-resistant food containers.
- PE (polyethylene), code 2 for HDPE and code 4 for LDPE: Flexible, good moisture barrier. LDPE (softer) is used for films, bags, shrink film. HDPE (harder) is used for pill bottles, shampoo bottles, cleaning bottles. Both have poor oxygen barrier properties.
The common point of PP and PE is low surface energy, meaning inks and adhesives do not adhere naturally. The printer must treat the surface with corona or plasma before printing directly on these two types. This is information you need to confirm with the supplier.
When to choose, when not to
Below is the decision framework based on actual functionality:
- Choose PET when: The product needs to showcase its contents through the bottle; requires decent moisture and gas protection without needing an additional coating; the product is a beverage, toner, serum, syrup, or cooking oil; and you want packaging that is easier to recycle than the other two types.
- Choose PP when: the contents are cream, oil, products with alcohol or light solvents; packaging that is heat-resistant (microwave-safe boxes, heat-resistant caps); requires hard, chemically inert bottles that are less likely to deform when the cap is tightened.
- Choose PE when: Soft, flexible packaging is needed, such as tubes, plastic bags, or shrink film; moisture protection is a priority; material cost is an important factor, and the product does not need oxygen protection.
- Do not choose virgin plastic when: The brand positions itself as sustainable but does not have a post-consumer recycled (PCR) version or a recovery plan. Virgin plastic undermines the green story even if the design looks "natural."
- No using single-layer PP or PE when: The product needs high oxygen barrier protection, such as easily oxidizable food. These two types have poor oxygen barriers and need to be combined with additional layers or switched to complex composite films.
- Not a good choice for purely luxury segments: Clear PET plastic feels good, but the tactile experience and absolute inertness still do not match glass in the eyes of premium consumers.
Costs, time and quantity
The material costs of all three plastic families are low to moderate compared to glass or metal. However, if you need bottles in custom shapes, the mold cost is an initial investment from the bottle supplier and is not included in the design fee. Bottle molds typically have significant costs and require a large enough output to break even; you should ask the supplier directly before deciding on a custom shape.
If using available bottles from the supplier's sample stock, the production time is much shorter than ordering new molds. In the case of custom shapes, the total time from design confirmation to delivery usually ranges from 4 to 8 weeks, depending on the factory and the complexity of the mold.
Food contact plastic packaging in Vietnam must comply with QCVN 12-1:2011/BYT from the Ministry of Health. You need to confirm this requirement with your supplier and request the corresponding certification.
Regarding printing costs: Sinh Vũ is responsible for designing the packaging structure, graphics, and print-ready files. Sinh Vũ does not guarantee printing prices, does not represent printing houses, and is not responsible for material price fluctuations from suppliers. All production quotes need to be confirmed directly with the printing house or bottle supplier.
What does Sinh Vũ need from you to get started
For Sinh Vũ to advise and design suitable plastic packaging, please prepare the following information in advance:
- Content containing: What the product is, whether it is liquid or solid, contains oil, alcohol, acid, or special ingredients.
- Number of SKUs: How many product codes need to be designed, and what are the volumes for each type.
- Sustainability requirements: Does the brand have a green positioning, need a PCR version, or have a recovery plan?
- Market and regulations: selling in Vietnam or exporting, whether the product comes into contact with food according to QCVN 12-1:2011/BYT.
- Budget and expected output: To allow Sinh Vũ to assess whether to create a custom mold or use existing bottle samples.
- Timeline: The date you need the actual goods to plan backward for the design and production time.
You can send your information through Sinh Vũ's request form, and the team will respond to confirm the material direction before starting to sketch the structure.
Decision checklist
Topic: PET, PP, PE plastics: how to differentiate for the right choice. Sinh Vũ guide, sinhvu.com
Select each item you find appropriate, then print or save as PDF to take with you.
If you have marked most of the signs above, this is the time to discuss in more detail. Sinh Vũ can help you review and propose a direction.
References
Propacks (Plastic Recycling Codes 1 to 7 Explained); BlueSky Solutions (Understanding Plastic Types); Wikipedia (Resin identification code, ASTM D7611); ChemLinked (Vietnam Food Contact Material Regulation QCVN 12-1:2011/BYT); Sinh Vũ's practical experience.
Frequently asked questions
How do PET and PP bottles differ, and can they be distinguished by sight?
PET bottles are clearer, have a shiny surface, and produce a distinct sound when tapped. PP bottles tend to be slightly opaque or milky and feel a bit softer. The most reliable way is to check the plastic identification code (resin code) engraved on the bottom: PET is code 1, PP is code 5. When requesting a quote from suppliers, Sinh Vũ always confirms the plastic code in the technical documentation.
Can PP and PE be recycled, or do we need to use PET for environmental friendliness?
PET is the most widely recycled plastic today and has a more common collection infrastructure. Technical recycled PP is possible, but the actual collection and recycling rates are significantly lower than PET. Soft film PE (LDPE) is typically only accepted at specialized collection points and does not enter mainstream recycling streams. If a brand wants a substantiated sustainability story, Sinh Vũ will provide further consultation on post-consumer recycled (PCR) plastic versions corresponding to each plastic family.
What regulations must food contact plastic packaging in Vietnam meet?
Bottles, jars, tubes, and PET, PP, PE films that come into direct contact with food in Vietnam must comply with QCVN 12-1:2011/BYT from the Ministry of Health regarding the safety of plastic packaging and utensils. When working with Sinh Vũ, you need to confirm whether the product comes into contact with food so that Sinh Vũ can clearly state this requirement in the technical documentation sent to suppliers.