Sunglasses (plastic frame)

Material Composition Assumptions

This assessment assumes a typical plastic frame sunglasses weighing approximately 50 grams with the following material composition:

• Cellulose acetate frame (25g, 50%) - Primary structural component providing durability and aesthetic finish
• Polycarbonate lenses (15g, 30%) - Impact-resistant optical elements offering UV protection
• CR-39 plastic lenses (8g, 16%) - Alternative lens material with superior optical clarity
• Plastic hinges and nose pads (2g, 4%) - Functional hardware components for fit and movement

Emerging sustainable alternatives include recycled plastic materials, bio-based nylon derived from castor oil, and bioacetate produced from wood pulp with plant-based plasticizers. These materials can significantly reduce the carbon footprint while maintaining structural integrity and visual appeal.

Manufacturing Geography

The majority of plastic frame sunglasses production occurs in China, which accounts for approximately 70% of global eyewear manufacturing. This concentration stems from established supply chains, specialized tooling capabilities, and integrated lens production facilities. Chinese manufacturing regions typically operate on an electricity grid with 555 gCO2/kWh intensity, significantly impacting the carbon footprint of energy-intensive molding and processing operations.

Secondary manufacturing hubs exist in Italy for premium brands and emerging facilities in Vietnam and Bangladesh for cost-competitive production. The choice of manufacturing location directly influences emissions through grid electricity composition and transportation distances to primary markets.

Regional Variation

Manufacturing Region	Grid Intensity	Estimated CCI Score	Adjustment vs Default
China	555 gCO2/kWh	150	Baseline
Italy	257 gCO2/kWh	125	-17%
Vietnam	468 gCO2/kWh	140	-7%
Germany	366 gCO2/kWh	135	-10%
India	708 gCO2/kWh	175	+17%

Provenance Override Guidance

1. Material specifications including percentage of recycled content, bio-based material composition, and virgin plastic reduction documentation
2. Manufacturing facility energy data including renewable electricity usage, grid mix verification, and energy efficiency metrics
3. Transportation records showing shipping distances, modal choices, and logistics optimization for both raw materials and finished goods
4. Production process documentation including molding temperatures, cycle times, and waste reduction measures
5. End-of-life considerations such as material recyclability, take-back programs, and circular economy integration strategies

Methodology Notes

• The CCI score represents cradle-to-gate emissions including material extraction, processing, manufacturing, and transportation to distribution centers
• Scope 3 emissions dominate due to upstream plastic production and material processing intensity
• Functional unit assumes one complete pair of sunglasses with standard UV protection capability
• Manufacturing emissions allocation reflects typical energy consumption for injection molding and assembly processes
• Transportation assumes average shipping distance from Asian manufacturing to North American and European markets
• Excludes retail operations, consumer use phase, and end-of-life disposal scenarios
• Data gaps exist for newer bio-based materials and closed-loop recycling systems