— APPLICATION
Caps and closures
Choosing polypropylene for caps and closures, or HDPE, starts with what is inside the pack and how the cap seals. A closure has to seal the pack, open when the user wants it to and survive the capping line. Below we set out how the two materials differ for screw caps, flip-tops and tube shoulders, and show the grades we can supply.
— REQUIREMENTS
What a closure has to do
A cap that loses torque leaks. A hinge that whitens or cracks after a few openings gets the product returned. Carbonated drinks push on the cap from inside for weeks, while a detergent attacks it chemically. A water or juice cap must not change the taste of what it closes.
Tethered caps add another demand. Since 3 July 2024, plastic caps on single-use plastic drinks bottles and cartons of up to three litres must stay attached to the container while it is in use (Directive (EU) 2019/904, Article 6). The band or hinge that holds the cap now flexes every time the pack is opened, so ductility matters as much as stiffness.
— SELECTION
Choosing between PP and HDPE closure grades
HDPE is the usual route for one-piece screw caps that seal without a liner, because the material flexes into the bottle neck. Look at stress-cracking resistance (ESCR) and at taste and odour behaviour. Higher density adds stiffness but leaves less of that flex.
PP homopolymer gives the stiffness for flip-tops and dispensing closures, and PP is the standard material for living hinges. Nucleated grades shorten cycles and hold dimensions.
PP random copolymer adds clarity where the closure is part of the look.
PP impact copolymer is for closures that are dropped, frozen or opened with force.
Flow is the next lever. Low-flow grades suit compression moulding and thick sections. High-flow grades fill thin walls and multi-cavity tools faster. Melt flow rate for PP is measured at 230 °C and for PE at 190 °C, so check the test conditions before comparing a PP figure with a PE one. Antistatic additives keep dust off stored caps.
— GRADES
Grades we can supply
Healthcare closure grades appear with the rest; ask for their regulatory summary before trials.
PP high crystallinity
AdvyForm
·
Velogy
PP
AdvyForm P1330
PP high crystallinity
AdvyForm P1330 is a nucleated homopolymer with very high crystallinity, high rigidity and high gloss. It is used for stiff injection-moulded articles.
Injection moulding
Industries
Consumer goods
Rigid packaging
AdvyForm
·
Velogy
PP
AdvyForm E1241
PP high crystallinity
AdvyForm E1241 is a high-crystallinity impact copolymer for injection moulding. It combines processability with stiffness, impact strength and gloss.
Injection moulding
Industries
Consumer goods
Rigid packaging
CertyForm
·
Velogy
PP
CertyForm E1440
PP high crystallinity
CertyForm E1440 is a nucleated polypropylene impact copolymer for injection moulding. It combines toughness and high stiffness with good processability.
Injection moulding
Industries
Medical & healthcare
PP homopolymer
CertyForm
·
Velogy
PP
CertyForm P1001
PP homopolymer
Polypropylene homopolymer for injection moulding and film applications, typically used in medical device components, closures and labware parts.
Injection moulding
Film extrusion
Industries
Medical & healthcare
AdvyForm
·
Velogy
PP
AdvyForm M1640
PP homopolymer
Nucleated metallocene-catalysed polypropylene homopolymer with antistatic agent for thin-wall injection moulding, with stiffness and transparency.
Injection moulding
Industries
Rigid packaging
KeyForm
·
Velogy
PP
KeyForm P1340
PP homopolymer
KeyForm P1340 is a nucleated homopolymer with an antistatic additive, for injection moulding. It combines good stiffness with good flowability.
Injection moulding
Industries
Consumer goods
Rigid packaging
PP random copolymer
AdvyForm
·
Velogy
PP
AdvyForm R1541
PP random copolymer
AdvyForm R1541 is a random copolymer with a clarifier and antistatic additives, for injection moulding. It has very good flowability and transparency and is typically used for thin-wall packaging.
Injection moulding
Industries
Consumer goods
Rigid packaging
AdvyForm
·
Velogy
PP
AdvyForm R1140
PP random copolymer
AdvyForm R1140 is a nucleated polypropylene random copolymer with medium melt-flow rate, for injection moulding.
Injection moulding
Industries
Consumer goods
Rigid packaging
AdvyForm
·
Velogy
PP
AdvyForm R1341
PP random copolymer
AdvyForm R1341 is a nucleated polypropylene random copolymer with good flowability, for injection moulding.
Injection moulding
Industries
Consumer goods
Rigid packaging
PP impact copolymer
KeyForm
·
Velogy
PP
KeyForm E0800
PP impact copolymer
KeyForm E0800 is a low-fluidity impact copolymer for injection moulding. It combines very high impact strength, including at low temperatures, with good stiffness.
Injection moulding
Sheet extrusion/thermoforming
Industries
Consumer goods
Rigid packaging
KeyForm
·
Velogy
PP
KeyForm E1230
PP impact copolymer
KeyForm E1230 is a nucleated heterophasic copolymer for injection moulding. It combines high stiffness with a good impact balance.
Injection moulding
Industries
Consumer goods
Rigid packaging
AdvyForm
·
Velogy
PP
AdvyForm E0830
PP impact copolymer
AdvyForm E0830 is a nucleated impact copolymer for injection moulding and thermoforming. Its documented characteristics include low-temperature impact performance, good stiffness and processability.
Injection moulding
Sheet extrusion/thermoforming
Industries
Consumer goods
Rigid packaging
HDPE
KeyForm
·
Velogy
HDPE
KeyForm H1200
HDPE
High-density polyethylene resin for general injection moulding, with good flowability, good processability and high rigidity.
Injection moulding
Industries
Consumer goods
Rigid packaging
Industrial
CertyForm
·
Velogy
HDPE
CertyForm H0700
HDPE
CertyForm H0700 is a high-density polyethylene combining organoleptic properties with a balance of stiffness, toughness and environmental stress-cracking resistance.
Injection moulding
Industries
Consumer goods
Medical & healthcare
Rigid packaging
AdvyForm
·
Velogy
HDPE
AdvyForm H0800
HDPE
AdvyForm H0800 is a high-density polyethylene for injection and compression moulding. It combines organoleptic properties with a balance of stiffness, toughness and environmental stress-cracking resistance.
Injection moulding
Industries
Consumer goods
Rigid packaging
— NEED HELP CHOOSING?
Not sure which grade fits?
Send us the closure type, the contents, the moulding route and your cycle target.
— PROCESSING
Injection or compression moulding
Both routes are used. Compression moulding is common for high-volume beverage caps and runs on lower-flow grades. Injection moulding suits complex shapes such as flip-tops, dispensing valves and tamper-evident bands. Each grade's data sheet names the processing methods it is designed for. Tell us your cavity count and cycle target and we will narrow the choice.
Injection moulding
Compression moulding
— DOCUMENTATION
Food contact and healthcare documentation
Under Regulation (EU) No 10/2011, a written declaration of compliance is needed at every stage of supply before retail. The closure maker issues it for the finished cap. The resin producer issues one for the grade, which we pass on; it supports the closure maker's declaration but does not replace it. The Packaging and Packaging Waste Regulation (EU) 2025/40 has applied since 12 August 2026, and its design-for-recycling rules reach the cap from 2030 at the earliest. For healthcare closures, see medical devices.
— PRODUCERS
Producers for this application
Brands for this application
— FAQ
Common questions
Is PP or HDPE better for a screw cap?
Which grades suit tethered caps?
Can I get food-contact documentation before trials?
— RELATED
