BOPP film VS BOPET film VS BOPA film

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BOPP film, BOPET film and BOPA film are very common materials in flexible packaging films. But they have different properties and are used in different applications.

1. BOPP film
BOPP film (biaxially oriented polypropylene film) is produced by stretching polypropylene film longitudinally and transversely. BOPP films are used in a wide variety of applications including packaging, labels and lamination. BOPP film is the substrate of choice for food packaging worldwide due to its inherent moisture barrier properties, sealing ability, high clarity, graphic reproducibility and shelf appeal, where the best possibility for packaging is a monolayer/homogeneous structure.

2. BOPET film
PET film is a polyester film made from oriented polyethylene terephthalate (PET). BOPET is used for its high tensile strength, chemical and dimensional stability, transparency, reflectivity, gas and aroma barrier properties, and electrical insulation

3. BOPA movies
Biaxially oriented nylon film (BOPA), with excellent properties, can be used in various high-end packaging. BOPA has very high tensile strength, puncture strength, excellent flexibility, resistance.

4. The performance difference between BOPP film, BOPET film and BOPA film is shown in the table

	BOPP	BOPET	BOPA
General	Physical stability, mechanical strength, air tightness, high transparency and gloss, tough wear resistance, but heat sealability and printing performance differences	Excellent mechanical properties, high rigidity, hardness and toughness, puncture resistance, friction resistance, high-temperature resistance and low-temperature resistance, chemical resistance, oil resistance, air tightness and fragrance retention, non-toxic, tasteless, easy to recycle	Has good abrasion resistance and corrosion resistance, high-temperature resistance, puncture resistance and tear resistance, good oxygen barrier property, but the poor barrier to water vapor, large moisture absorption and moisture permeability, and poor heat sealability
Air barrier	Poor	Good	Good
Liquid barrier	Good	Ok	Poor
Metalizing	Poor	Good	Ok
Tensile strength	Poor	Good	Good
Temperature range	-50-120℃	-70-150℃	-60-150℃

5. Printability
Among the three flexible packaging films, BOPA has the best printing performance. Because BOPA film has a polar structure. No surface treatment is required before printing.

BOPP printing performance is the worst. Because BOPP film is a non-polar polymer. Their chemical stability is high. The surface tension is small. Not easily penetrated by most inks and solvents.

Printing performance is mainly determined by surface tension:

Surface tension	Value (mN/m)
PP	34 (mN/m)
PET	40~43
PA	46~52

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