— APPLICATION
Polypropylene homopolymers for BOPP film
A BOPP film grade proves itself on the stretching line. Biaxially oriented polypropylene film is stretched several times over in both directions, and a resin that does not stretch evenly breaks the film and stops the line. This page explains what a homopolymer needs for tenter and tubular lines and for plain, coextruded or metallised film, and shows the grades we can supply.
— REQUIREMENTS
What a BOPP line asks of the resin
On a tenter line the cast sheet is stretched roughly five times lengthways and eight to ten times across. Every gel, contaminant or weak spot is stretched with it. The result is a film break, lost time and scrap.
The resin also has to give a flat film with an even thickness profile, so the rolls wind and slit cleanly. After that the converter wants high gloss, low haze and a surface that takes corona treatment, print and, for barrier film, a layer of metal.
— SELECTION
Choosing a biaxially oriented polypropylene resin
The core of a BOPP film is homopolymer, and its crystallinity decides how it stretches. A homopolymer with slightly lower isotacticity stretches over a wider temperature window. A highly isotactic one gives stiffer film but is less forgiving on the line. Molecular weight distribution matters as well, because it affects how evenly the sheet draws.
For film that will be metallised, look for a grade with no slip or antiblock agents and no added calcium stearate. In coextruded film, slip and antiblock go into the thin skin layers as masterbatch, so the core grade can stay clean.
Check that the data sheet names your film type and your line. A grade made for one line is not automatically right for the other.
— GRADES
Grades we can supply
Check the line type and film structure named on each data sheet before trials.
PP homopolymer
KeyForm
·
Velogy
PP
KeyForm P1003
PP homopolymer
KeyForm P1003 is a high-flow polypropylene homopolymer for biaxially oriented polypropylene (BOPP) film on tubular double-bubble lines and for cast film.
Film extrusion
BOPP
Industries
Flexible packaging
KeyForm
·
Velogy
PP
KeyForm P0601
PP homopolymer
KeyForm P0601 is a polypropylene homopolymer for biaxially oriented polypropylene (BOPP) film. It is intended for plain and coextruded structures suitable for metallisation.
BOPP
Film extrusion
Industries
Flexible packaging
KeyForm
·
Velogy
PP
KeyForm P0700
PP homopolymer
KeyForm P0700 is a polypropylene homopolymer for biaxially oriented polypropylene (BOPP) film. It is suitable for metallisable film in monolayer and coextruded structures.
Sheet extrusion/thermoforming
Film extrusion
BOPP
Industries
Flexible packaging
— NEED HELP CHOOSING?
Not sure which grade fits?
Tell us your line type, tenter or tubular, the film structure, its thickness and whether it will be metallised.
— PROCESSING
Tenter and tubular lines
Tenter lines stretch the sheet lengthways first, then crossways. Tubular double-bubble lines stretch in both directions at once and give a balanced film. The two need different stretching behaviour from the resin. Some BOPP homopolymers are also extruded into sheet for solid-phase thermoforming, covered on sheet and thermoforming. Tell us which line you run and the film thickness.
BOPP
— DOCUMENTATION
Food contact and recyclability
Most BOPP film ends up in food packs. The producer's declaration of compliance under Regulation (EU) No 10/2011 covers the grade, and the film maker issues its own for the film. The Packaging and Packaging Waste Regulation (EU) 2025/40 has applied since 12 August 2026, and its design-for-recycling rules reach flexible packs from 2030 at the earliest. BOPP laminated to a cast PP film grade keeps the whole pack in one polymer family.
— PRODUCERS
Producers for this application
— FAQ
Common questions
What makes a metallisable BOPP homopolymer different?
Can I run a tubular BOPP grade on a tenter line?
— RELATED
