Windshield Wiper Blades (pair)

Material Composition Assumptions

A typical windshield wiper blade pair weighs approximately 175 grams and consists of multiple material components. Natural rubber comprises the largest portion at 60-70 grams, providing the flexible wiping edge that contacts the windshield surface. Recycled rubber content adds another 35-44 grams, contributing to the overall rubber composition while reducing virgin material requirements.

The structural framework relies on spring steel components weighing 26-35 grams, which provide the necessary tension and flexibility for effective windshield contact. Additional recycled steel content contributes 9-18 grams to the total mass. Plastic components, primarily polycarbonate or acetal materials, account for 14-21 grams and form the blade housings and connection points.

A thin graphite coating weighing 3-5 grams is applied to reduce friction and improve wiping performance across the rubber contact surfaces.

Manufacturing Geography

Primary manufacturing occurs in China, Thailand, and Mexico, where established automotive supply chains support high-volume production of wiper blade assemblies. These regions benefit from proximity to raw material sources, particularly natural rubber plantations in Southeast Asia, and established steel processing facilities.

China dominates global production due to integrated supply chains spanning from rubber processing to final assembly operations. The Chinese manufacturing grid operates at approximately 574 grams of CO2 per kilowatt-hour, reflecting the country’s coal-heavy electricity generation mix. Thailand serves as an alternative production hub with direct access to natural rubber supplies, while Mexico provides manufacturing capacity for North American markets with lower transportation emissions.

Regional Variation

Manufacturing Region	Grid Intensity	Estimated CCI Score	Adjustment vs Default
China	574 gCO2/kWh	2.8	Baseline
Thailand	436 gCO2/kWh	2.6	-7%
Mexico	398 gCO2/kWh	2.5	-11%
Germany	366 gCO2/kWh	2.4	-14%
France	83 gCO2/kWh	2.1	-25%

Provenance Override Guidance

1. Submit certified material composition data showing actual percentages of natural rubber, recycled rubber, steel, and plastic components with third-party verification of recycled content claims.

2. Provide manufacturing facility energy consumption records documenting actual electricity usage per unit produced, including any renewable energy certificates or on-site renewable generation.

3. Supply transportation documentation showing shipping distances and modes from raw material suppliers to manufacturing facilities, plus distribution to end markets.

4. Document any material sourcing certifications such as sustainable rubber certification or responsible steel sourcing that demonstrate lower-impact supply chain practices.

5. Provide facility-specific emissions data including any process improvements, waste heat recovery systems, or manufacturing efficiency optimizations that reduce per-unit environmental impact.

Methodology Notes

• The CCI score represents cradle-to-gate emissions for a complete wiper blade pair including all upstream material production and manufacturing processes but excluding installation, use phase, and end-of-life treatment.

• Scope 3 emissions dominate the footprint due to energy-intensive rubber processing and steel production, while Scope 2 remains relatively low reflecting the assembly-focused manufacturing operations.

• The functional unit assumes standard passenger vehicle wiper blades with typical replacement intervals, not including premium or specialty blade designs.

• Packaging emissions are included but represent a minor contribution compared to material production impacts.

• Regional variations in natural rubber agricultural practices create significant uncertainty in Scope 3 emissions that may not be captured in facility-level data.

• End-of-life recycling potential is excluded from the score but may offset some emissions through material recovery in circular economy applications.