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Polypropylene homopolymer, random copolymer and impact copolymer — by the MFR you run

Homopolymer for stiffness, random copolymer for clarity, impact copolymer for toughness, including in the cold. Tell us the type and melt flow rate and we’ll match it.

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Which type of polypropylene?

Polypropylene comes in three families. Homopolymer is the stiffest and most heat resistant, but turns brittle in the cold. Random copolymer adds a little ethylene for better clarity and a lower melting point. Impact copolymer carries a rubber phase that keeps parts tough even below freezing. Within each, melt flow rate (MFR, at 230°C / 2.16 kg) sets the process: low MFR for extrusion and thermoforming, mid MFR for general injection molding, high MFR for thin-wall parts.

Grades we source

  • Homopolymer: extrusion, fiber, injection and thin-wall
  • Random copolymer: clear and clarified grades
  • Impact copolymer: low to high MFR, medium and high impact
  • Talc- and glass-filled PP
  • FDA food-contact grades
  • UV-stabilized grades

Typical MFR by process

Sheet, thermoforming, extrusion~1–4 g/10 min
General injection molding~10–35 g/10 min
Thin-wall injection molding~35–100+ g/10 min
Fiber and nonwovensWide range, often higher

Homopolymer vs. impact copolymer

StiffnessHomo: higher · Impact: lower
Cold impactHomo: poor · Impact: good
Heat resistanceHomo: higher
ClarityRandom copolymer is best
Density~0.90 g/cm³ (all)

Property ranges are general guidance and vary by grade and supplier; our team confirms the exact spec and certification for your application.

Related materials: Fix: brittle parts · Compare: PP vs. HDPE · Polypropylene (all grades) · Guide: melt flow index · all materials

Tell us the grade you run now

We’ll match it or find a qualified equivalent and price it. A polymer chemist reviews every request personally.

We ship to the U.S. & Canada only. Orders start at one gaylord (~1,000 lb). No obligation.

Run this material every month? Put a backup source on file.We match your exact grade or a certified equivalent, price it, and keep it ready — no switching, no obligation.
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Want a second price on polypropylene?

Send your grade and volume and we’ll price it against what you pay now.

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