substance

Polypropylene

A polymer, recorded by the registry's polymer rule (docs/registry.md, Polymers): the formula is the repeat unit C3H6 (end groups, catalyst residues and additives neglected), and the molar mass is that of the repeat unit, not of a chain; traded as resin pellets (homopolymer and copolymer grades, not split yet). The ChEBI id is poly(propylene), which cross-references CAS 9003-07-0 and gives (C3H6)n (ChEBI via EBI OLS, 2026-11-05). No InChIKey or PubChem CID: a polymer has no standard InChIKey, PubChem has no compound for CAS 9003-07-0, and the chemicals package (1.5.2) does not hold the CAS, so the entry is in tests/test_registry.py's CHEMICALS_PACKAGE_EXCEPTIONS.

Formula: C3H6
CAS: 9003-07-0
ChEBI: CHEBI:53550

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Made by

Polypropylene by Ziegler-Natta polymerisation of propylene, bulk loop and gas phaseMain productConcept · not reviewed

Used by

No process in the Atlas uses this yet.

When a process with this chemical is added to the library, it appears here.

Routes compared

One route in the Atlas makes Polypropylene: nothing to compare yet. A comparison appears when a second route is added.

Per 1 kg of Polypropylene: inventory from each route's LCI dataset, unallocated; footprints per the functional unit of their own LCA.

Route	Tier, design maturity, review status	Geography, year	Energy	Feedstocks	Key emissions	Footprint	Comparability
Polypropylene by Ziegler-Natta polymerisation of propylene, bulk loop and gas phasecontinuous Ziegler-Natta polymerisation in liquid propylene (loop reactors) or in the gas phase (fluidised bed), with extrusion; not the solvent slurry process or metallocene grades in particular	Tier 1 (sourced conceptual)Design maturity: Concept (research)Not independently reviewedDataset review: unreviewed	US, 2016	Electricity (grid and cogeneration): 0.3 kWh Natural gas (as methane), burnt for process energy: 0.023 kg	Propylene: 1.01 kg Nitrogen, gaseous (purge and inerting): 0.064 kg Combustion oxygen, from ambient air: 0.103 kg (free)	CO2 from natural gas combustion and flaring: 0.0732 kg Water vapour from combustion: 0.0558 kg NMVOC to air: 0.00011 kg Particulates, < 2.5 um, to air: 0.000009 kg Nitrogen oxides to air: 0.000044 kg Methane to air: 0.000001 kg Dinitrogen monoxide to air: 0.0000001 kg Carbon monoxide to air: 0.00001 kg Sulfur oxides (as SO2) to air: 0.000001 kg Ammonia to air: 0.000001 kg	no footprint	–

ISO 14044 requires a critical review (by a panel of interested parties, ISO/TS 14071) of a comparative assertion intended to be disclosed to the public. These routes are listed side by side for screening; a statement that one is better than another needs that review. None of these routes has had such a review.