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Housewares & appliances

— APPLICATION

PP and HDPE for housewares and appliances

PP for housewares has to look good on the shelf and still look good after a year in a kitchen. Spoons scratch a mixing bowl, a lunch box goes through the dishwasher every night and a kettle base sits next to a heating element. This page sets out how polypropylene and HDPE compare for kitchenware, storage boxes and small-appliance parts, which levers control gloss and stiffness, and what paperwork the finished article needs.

White plastic measuring jug and chopping board with two clear food storage containers, one with a teal lid

— REQUIREMENTS

What a kitchen does to a part

Kitchen items are handled every day and judged on looks. A storage box that clouds, or a bowl that is covered in fine scratches after a month, looks old long before it breaks. The dishwasher adds hot water, detergent and drying heat, cycle after cycle. Lids have to snap on and off without cracking at the rim. Thin walls save material and cycle time, but a full container must not bow when someone lifts it. Appliance parts must keep their shape near motors and heating elements, and the appliance maker answers for every material inside the product.

— SELECTION

Choosing polypropylene for kitchenware

  • PP homopolymer gives stiffness and a hard, glossy surface. High-crystallinity and nucleated homopolymers go further; in some stiff parts they replace a mineral-filled compound.

  • Impact copolymer is for items that get dropped or go in the freezer: storage boxes, laundry baskets, lids.

  • Clarified random copolymer gives see-through storage boxes and jugs. It is less stiff than homopolymer, so walls may need to be a little thicker.

  • HDPE suits bins, buckets and lids where toughness and stress-cracking resistance matter more than gloss.

PP melts at a higher temperature than HDPE, which is one reason it is the usual choice for dishwasher-safe items. A stiffer, harder surface also marks less easily under cutlery.

Flow decides how thin and long a wall you can fill. High-flow grades fill large, thin storage boxes; medium-flow grades suit thicker, stiffer parts. Antistatic additives keep dust off items on display. Food tubs and trays for packing lines have their own page: thin-wall packaging and food containers.

— GRADES

Grades we can supply

For see-through items, compare the clarified random copolymers first.

— NEED HELP CHOOSING?

Not sure which grade fits?

Send us the item, its wall thickness, whether it goes in the dishwasher and your cycle target.

— PROCESSING

High-gloss PP injection moulding

Most housewares are injection moulded. Gloss comes from the tool as much as from the resin: a polished cavity, a high enough melt temperature and steady packing pressure. Nucleated grades set faster and shrink more evenly, which keeps flat lids flat. Trays and tubs can also be thermoformed from homopolymer sheet. Tell us the part size, wall thickness and cavity count and we will narrow the choice.

Injection moulding

Sheet extrusion/thermoforming

— DOCUMENTATION

Food contact and appliance rules

Kitchenware is a food-contact article. Under Regulation (EU) No 10/2011 the maker of the finished item issues a declaration of compliance and checks migration on the article itself; the resin producer's declaration for the grade supports it. Dishwasher resistance is also tested on the article, and EN 12875-1 gives a reference method for domestic dishwashers. For appliances, the maker answers for the substance limits of the RoHS Directive 2011/65/EU. We pass on the producer's regulatory summary for the grade you choose.

— FAQ

Common questions

Can I use PP for appliance housings?

Is PP or HDPE better for dishwasher-safe items?

Do you supply clear grades for storage boxes?