CPP
Also known as: CPP film, cast polypropylene, cast PP, RCPP, retort CPP
CPP is non-oriented cast polypropylene film, mainly used as the heat-sealing inner layer of laminated pouches, including retort pouches.
CPP (cast polypropylene) is polypropylene film produced by casting melt onto a chill roll without stretching. Because it is not oriented, it is softer than BOPP and seals readily, so it is mostly used as the inner sealant layer of laminated pouches.
Typical uses
- BOPP/CPP laminates for dry food, bakery and confectionery. Both layers are PP, giving a mono-material structure.
- Retort pouches: heat-resistant grades (often called RCPP) withstand sterilisation at roughly 121–135 °C, which is why they line most retort pouches.
- Metallised CPP as a barrier layer in snack packs.
CPP or PE?
CPP is clearer, stiffer and more heat-resistant. PE seals at lower temperatures, stays tough in the cold and resists punctures better. Frozen and heavy products usually lean towards PE; hot-fill, sterilised or high-clarity packs lean towards CPP.
Tell your supplier early whether the product will be hot-filled, pasteurised or retorted, since that decides which CPP grade, if any, is right. Common gauges are around 20–80 microns.
Frequently asked
What is the difference between CPP and BOPP?
Both are polypropylene. BOPP is stretched in two directions and used as a stiff printed outer layer; CPP is unstretched, softer and used as the sealant layer.
Can CPP be used for retort pouches?
Yes, special retort grades of CPP are designed to survive sterilisation temperatures and are the standard inner layer of retort pouches.
Related terms
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