Markings of materials used in the production of bags

The bags are made of two or three different layers of material. The description of the bag always includes an abbreviation indicating the material from which the bag is made. We offer you an explanation of what each abbreviation means and what properties each material has.

When choosing bags, we recommend prioritizing functionality; in this case, appearance always comes second.

It is no longer true that the aluminum layer is the most important layer for preserving aroma. There is a substitute, namely metallized PET film or various combinations of films, e.g., BOPA + CPP.

All bags sold by us are intended for contact with food, and all bags come with the necessary certificates.

MICRON - the term micron and the symbol "μ" indicate the thickness of the film and mean one thousandth of a millimeter, 0.001 mm

KRAFT - paper layer. In most cases, recycled Japanese paper is used for production. You can print on the bag with a stamp or use a sticker, but it is advisable to use a sticker with a thicker layer of adhesive, otherwise the sticker may come off after the bag is filled.

PET (polyethylene terephthalate) - PET has excellent properties for food packaging, especially its tensile strength, excellent chemical resistance, low weight, good elasticity, and stability in a wide temperature range (from -60 to +220 °C).

PE - polyethylene - PE has a low specific weight, the ability to shrink and weld when heated, excellent resistance to water and water vapor, and conversely, it allows gases such as oxygen, carbon dioxide, and aromatic substances to pass through. In most cases, it is used as an inner layer, thanks to which the bag can be sealed with heat (by welding with a welder or pliers).

OPP - oriented polypropylene - PP is similar to PE (polyethylene) in its properties. However, it is harder, stronger, and more heat resistant.

OPP mat - matte finish OPP film. Provides the same properties.

CPP - cast polypropylene - very similar properties to OPP, excels in high transparency and is stronger than OPP. In most cases, it is used as an inner layer, thanks to which the bag can be sealed with heat (by welding with a welder or pliers).

AL - aluminum layer. This layer serves to prevent light, moisture, and oxygen from entering the bag.

BOPA (nylon) - the use of this film is constantly growing. It is highly puncture resistant and provides a high barrier against gases and moisture. It has high chemical resistance. In combination with CPP or PE film, it is a full-fledged replacement for AL film. Stability in a wide temperature range (from -60 to +150 °C).

PERG (GPP) - parchment substitute is writing paper made from natural raw materials without the addition of chemicals. This layer is greaseproof and waterproof.

BIO - compostable material (corn starch, paper, plant cellulose). This material is used to make bags, zipper closures, and coffee valves. The bags differ in the number of layers and strength of the materials. The strongest "aroma save" protection is provided by bags marked "metallized". The material is fully compostable. Decomposition time is from 2 months to half a year.