Polypropylene (PP)

Polypropylene is cheap, chemically resistant and remarkable in fatigue, which is why it dominates living hinges, containers, lids and fluid handling parts. It is a semicrystalline resin with high shrinkage, so mould design has to account for it early.

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Capacidades

Qué hacemos

✓

Excellent chemical resistance to acids and bases

Excellent chemical resistance to acids and bases

✓

Superb fatigue life, ideal

Superb fatigue life, ideal for living hinges

✓

Low density, so parts are light and cheap

Low density, so parts are light and cheap

✓

Food contact and medical grades available

Food contact and medical grades available

✓

Good impact strength, especially at low temperature

Good impact strength, especially at low temperature

✓

Moulded, machined, welded and thermoformed

Moulded, machined, welded and thermoformed

Materiales

Materiales

Homopolymer PP
Copolymer PP
Glass-filled PP
Talc-filled PP
PP sheet and rod
Food contact grades
Especificaciones

Especificaciones clave

EspecificaciónDetalles
Tensile strength33 MPa
Impact strengthNotched Izod 25–60 J/m
Heat deflection100 °C at 0.45 MPa
Density0.905 g/cm³
Shrinkage1.0–2.5 % (high)
ChemicalExcellent, non-polar
Acabados

Acabados superficiales y postprocesado

Moulded-in texture

Moulded-in texture

Painting with PP primer

Painting with PP primer

Ultrasonic welding

Ultrasonic welding

Laser marking

Laser marking

FAQ

Preguntas frecuentes

Why is PP hard to glue and paint?

Its non-polar surface resists adhesion, so parts need flame, plasma or primer treatment before bonding or painting. We specify the treatment in the process plan.

What is a living hinge?

A thin PP section that flexes thousands of times without breaking, which is why PP dominates flip-top lids and clip designs. Living hinges must be designed in the flow direction of the mould.

Does PP shrink a lot?

Yes, between 1 and 2.5 %, which is much higher than ABS. Moulds and cooling are designed around that shrinkage, and wall thickness consistency matters more than with other resins.

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