Many customers when choosing material films to produce plastic packaging will wonder about PE film and PP film – which is better. But it’s not about being better – the point is – what is your product? What are you wanting to do? Both of these plastics are considered superior for packaging production.

1. Let’s compare some of the properties of each

Mechanical Properties:

The density of polypropylene (PP) is between 0.895 and 0.92 g.cm. The density of polyethylene can vary from a low of 0.857 g/cm3 and to a maximum of 0.0975 gm/cm3. As you can see, PP has the lowest density. Polyethylene (PE) is further broken down into weights or densities which is done so the plastic can serve a more specific purpose. This is done during manufacturing.

The categories of Polyethylene are as follows: 

Ultra-high-molecular-weight polyethylene (UHMWPE) is tough and resistant to chemicals. It is used to manufacture moving machine parts, bearings, gears, artificial joints, and some bulletproof vests.

High-density polyethylene (HDPE), recyclable plastic no. 2, is commonly used as milk jugs, liquid laundry detergent bottles, outdoor furniture, margarine tubs, portable gasoline cans, drinking water distribution systems, water drainage pipes, and grocery bags.

Medium-density polyethylene (MDPE) is used for packaging film, sacks and gas pipes, and fittings.

Low-density polyethylene (LDPE) is flexible and is used in the manufacture of squeeze bottles, milk jug caps, retail store bags, and linear low-density polyethylene (LLDPE) as a stretch wrap in transporting and handling boxes of durable goods, and as the common household food covering.

Polypropylene which is normally tough and flexible can have its density altered with the addition of fillers.

Chemical Properties:

PP is resistant to fats and almost all organic solvents when it is at room temperature. It can withstand non-oxidizing acids and bases in containers made from polypropylene. Contrast this to polyethylene which is more chemically resistant. 

Polyethylene consists of non-polar, saturated, high molecular weight hydrocarbons. Therefore, its chemical behavior is similar to wax or paraffin. The individual macromolecules are not covalently linked. Overall polyethylene is partially crystalline. Higher crystallinity increases density and mechanical and chemical stability.

Other intersting page: What is PA film? Uses of PA films in the food industry

Optical Properties:

PP can be made translucent when uncolored but it’s not as transparent as acrylic or other plastic. Often colored pigments are added.

PE on the other hand can clear, milky-opaque, or opaque. The color is dependent on the thermal history and film thickness.

2. Uses of Polypropylene and Polyethylene:

Every day we have contact with PP or PE.  Polypropylene is used to make bottles, hinges, packaging materials, parts for automobiles, clear bags, ropes, rugs, roofing membranes, geotextiles, erosion control mats and so much more.

Polyethylene is vastly used in packaging (plastic bags, plastic films), geomembranes, and plastic sheeting to protect the environment for construction projects.

3. Summary of Properties:

 

MaterialHardnessStiffnessUV ResistanceChemical ResistanceToughnessImpact ResistanceTemperature ResistantPrice
PPHighHighGoodExcellentExcellentGoodHigherHigher
PEMediumMediumFairExcellentExcellentFairLowerLower

Both Polypropylene and Polyethylene play a huge role in the world as we know it today.

4. A supplier of prestigious and quality plastic films

Union Packaging with many years of experience in the field of providing plastic films and plastic packaging is manufactured from virgin plastic particles and meets FDA standards. Customers can rest assured when cooperating with us because Union Packaging always ensures:

  • Customer satisfaction is the number 1 priority
  • Outstanding product quality from stable sources of quality goods from Taiwan and China
  • Competitive price
  • Reputation builds a brand
  • Product safety certification
  • Fast shipping
  • Various payment policies
  • Enthusiastic, dynamic, and creative staff
  • Providing a wide range of plastic films for packaging materials
  • Being a close partner of many suppliers

Union Packaging is a reputable and experienced supplier of OPP, CPP, MCPP, PET, MPET, PE laminated film…. in the industry. We always try to research, develop and improve product quality, improve customer care ability to meet the increasing demands of the domestic and foreign packaging market. Please contact us now: 0987 437 469 – 0903 750 384 for specific advice and quotation.

UNION PACKAGING SOLUTION JOINT STOCK COMPANY

Address: No. 5, 3643A Street, Pham The Hien, Ward 7, District 8, HCMC

Tel: 0987 437 469 – 0903 750 384

Email: sales@hopnhatpack.com

Website: www.hopnhatpack.com – www.baobihopnhat.com

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