Ruler (plastic 30cm)

Material Composition Assumptions

A standard 30cm plastic ruler consists primarily of petroleum-derived polymer materials, with the most common compositions including polyethylene terephthalate, polypropylene, or low-density polyethylene. The typical ruler weighs approximately 20 grams and contains 95% polymer resin with 5% comprising colorants, UV stabilizers, and other additives. The polymer feedstock originates from fossil fuel extraction and subsequent chemical processing through steam cracking operations. Manufacturing involves injection molding or extrusion processes that shape the raw resin into the final ruler form with measurement markings.

Manufacturing Geography

The majority of plastic rulers are manufactured in China, which accounts for approximately 60% of global plastic production capacity. Chinese manufacturing facilities typically operate on an electricity grid with carbon intensity of 555 gCO2/kWh, significantly higher than global averages due to coal-fired power generation. This region dominates ruler production due to established polymer processing infrastructure, proximity to petrochemical feedstock sources, and integrated supply chains for educational and office products. The concentration of manufacturing in carbon-intensive grid regions amplifies the climate impact of production activities.

Regional Variation

Manufacturing Region	Grid Intensity	Estimated CCI Score	Adjustment vs Default
China	555 gCO2/kWh	28	Baseline
Germany	366 gCO2/kWh	24	-14%
United States	386 gCO2/kWh	25	-11%
India	632 gCO2/kWh	31	+11%
Brazil	85 gCO2/kWh	18	-36%

Provenance Override Guidance

1. Primary polymer resin type documentation with specific carbon intensity values from the resin supplier including extraction and processing emissions data.

2. Manufacturing facility energy consumption records detailing electricity usage, fuel consumption, and local grid carbon intensity factors during production periods.

3. Transportation documentation covering shipping distances, modes of transport, and logistics pathways from raw material sources through finished product distribution.

4. End-of-life waste management data from destination markets including recycling rates, landfill diversion percentages, and waste-to-energy facility specifications.

5. Recycled content certification showing percentage of post-consumer or post-industrial recycled material incorporated into the final product composition.

Methodology Notes

• The CCI score represents cradle-to-grave lifecycle emissions for a single 30cm plastic ruler including raw material extraction, manufacturing, transportation, and end-of-life disposal
• Scope 1 emissions dominate due to energy-intensive polymer production processes including steam cracking and polymerization reactions
• Scope 3 emissions capture upstream fossil fuel extraction impacts and downstream landfill methane generation over extended timeframes
• The functional unit assumes standard ruler dimensions and weight without consideration for packaging materials or retail display components
• Excluded factors include manufacturing equipment production, facility construction impacts, and variations in measurement marking processes
• Data gaps exist around specific additive formulations and regional variations in waste management infrastructure effectiveness