Paints and Coatings

Material Composition Assumptions

The default functional unit is one litre of paint or coating, modelled as a weighted blend across architectural (decorative) and industrial coating types. A representative litre of architectural paint weighs approximately 1.2–1.4 kg depending on pigment loading and water content.

Key material constituents and their emission relevance:

• Binder / resin (~25–35% by mass): The film-forming polymer. Acrylic latex (water-borne, ~3.1 kgCO₂e/kg resin) dominates architectural paints. Alkyd resin (oil-borne, ~3.8 kgCO₂e/kg) is common in gloss and trim paints. Epoxy and polyurethane resins (~4–6 kgCO₂e/kg) are used in industrial protective coatings. Resin production is Scope 3.
• Pigments (~15–25% by mass): Titanium dioxide (TiO₂) is the primary white pigment and opacity source. TiO₂ is one of the most carbon-intensive commodity chemicals per kilogram (~3.5–6.5 kgCO₂e/kg depending on process route). A litre of premium white paint may contain 200–350 g of TiO₂, contributing ~1.2–1.8 kgCO₂e from pigment alone.
• Solvents (~5–50% by mass): Water is the carrier in latex/emulsion paints (low embodied carbon). Mineral spirits, xylene, and other VOC-containing solvents in oil-based paints have higher upstream production emissions (~0.8–1.5 kgCO₂e/kg) and release VOCs during application (a co-benefit of water-borne reformulation beyond carbon).
• Additives (~3–8% by mass): Biocides, thickeners (HASE, HEUR), dispersants, defoamers, coalescents. Low individual mass but some (e.g., coalescents such as Texanol) are derived from complex petrochemical synthesis.
• Packaging (~5–10% by mass equiv.): Steel cans (primary) with tinplate lids. 1-litre and 4-litre steel cans represent ~0.15–0.25 kg of steel per litre of paint; steel production adds ~0.3–0.4 kgCO₂e per litre of paint.

Water-borne vs. solvent-borne distinction: Water-borne architectural paints typically score ~2.0–2.5 kgCO₂e/litre. Solvent-borne industrial coatings typically score ~3.5–5.0 kgCO₂e/litre. The default 3.0 kgCO₂e/litre represents a market-weighted blend.

Manufacturing Geography

Paint and coatings manufacturing is globally distributed, with production closely following population and construction activity:

• EU (~22% of global production by value): High regulatory pressure (REACH, VOC Directive) drives water-borne formulation. Leading producers: AkzoNobel (Netherlands), BASF Coatings (Germany), Jotun (Norway).

• USA (~20% of global production): Sherwin-Williams, PPG, and RPM International dominate. EPA VOC regulations drive water-borne architecture paints; industrial coatings remain solvent-heavy.

• China (~35% of global production): Rapid growth; mix of local brands (Nippon Paint China, Huarun) and multinational production. Higher grid intensity and greater proportion of solvent-borne industrial products.

• Grid intensity: ~450 gCO₂e/kWh used as global blended average for Scope 2 (blending, milling, and filling operations). Paint manufacturing is not especially electricity-intensive compared to primary materials production; Scope 2 is a secondary driver.

• Rationale: The dominant carbon driver is Scope 3 raw materials (TiO₂, resins, solvents), which are globally traded and produced independently of the paint blending geography. Regional variation in paint manufacturing location has a modest effect on the total score.

Regional Variation

Manufacturing Region	Grid Intensity	Formulation Type	Approx. CCI Score
EU (water-borne architectural)	~300 gCO₂e/kWh	Latex / acrylic	~2.0–2.5 kgCO₂e/L
USA (water-borne architectural)	~390 gCO₂e/kWh	Latex / acrylic	~2.2–2.7 kgCO₂e/L
Global blend — default	~450 gCO₂e/kWh	Mixed	~3.0 kgCO₂e/L
China (industrial solvent-borne)	~580 gCO₂e/kWh	Alkyd / epoxy	~3.5–5.0 kgCO₂e/L
Industrial protective coatings (global)	~450 gCO₂e/kWh	Epoxy / PU	~4.0–5.5 kgCO₂e/L

Note: The formulation type (water-borne vs. solvent-borne, pigment loading, TiO₂ content) drives more variability in the CCI score than manufacturing geography. A low-TiO₂ deep-base water-borne paint may score as low as 1.5 kgCO₂e/litre; a high-build solvent-borne industrial epoxy may exceed 5.0 kgCO₂e/litre.

Provenance Override Guidance

A paint manufacturer or specifier may override the default CCI score by submitting:

1. Product-specific EPD per EN 15804 or ISO 14025, covering the specific formulation, production site, and functional unit (typically 1 m² of coverage at specified dry film thickness rather than per litre).
2. Bill of materials with supplier-specific emission factors: Particularly for TiO₂ (process route — chloride vs. sulphate — and production site energy), binder resin (fossil vs. bio-based), and solvent content.
3. Low-TiO₂ or TiO₂-free formulation declaration: Products using alternative opacifiers (hollow-sphere pigments, titanium substitutes) or reduced TiO₂ loading may achieve significantly lower scores. Certification via supplier EPD.
4. Recycled steel can documentation: Use of high-recycled-content tinplate (>70% recycled steel) reduces the packaging contribution; certifiable via supplier mill certificate.

AkzoNobel and Sherwin-Williams publish individual product EPDs for major product lines. The European Coatings Association (CEPE) supports a harmonized LCA methodology for the sector.

Methodology Notes

• CCI score of 3.0 kgCO₂e per litre is a market-weighted blend of water-borne and solvent-borne architectural and industrial coatings. The per-kg intensity of ~2.5 kgCO₂e/kg reflects the approximately 1.2 kg/litre density of a representative architectural paint.
• Scope breakdown: Scope 3 (~75%, ~2.25 kgCO₂e/L) covers upstream raw material production — TiO₂, resins, solvents, and packaging. Scope 2 (~20%, ~0.60 kgCO₂e/L) covers blending, milling, and filling operations at paint manufacturing plants. Scope 1 (~5%, ~0.15 kgCO₂e/L) covers direct combustion for process heat at manufacturing sites.
• Functional unit: One litre of paint or coating, cradle-to-manufacturing-gate. Application and use-phase VOC emissions, and end-of-life (waste paint disposal), are excluded from the default score.
• TiO₂ sensitivity: TiO₂ content is the single largest uncertainty. A high-hiding premium white architectural paint with 300 g/L TiO₂ (chloride process, ~4.0 kgCO₂e/kg TiO₂) contributes ~1.2 kgCO₂e/L from pigment alone — 40% of the total. A tinted or deep-base paint with 80 g/L TiO₂ contributes only ~0.32 kgCO₂e/L.
• Data gaps: Specialty coatings (anti-corrosion, intumescent, marine antifouling, aerospace) are not represented in the default score and may have significantly higher intensities due to complex resin systems and specialty pigments. Biocide and additive emission factors are poorly documented in public LCA databases.
• VOC and non-GHG impacts: Solvent-borne paints release VOCs during application, contributing to ground-level ozone and photochemical smog. This is a separate environmental impact not captured in the CCI score but highly relevant for product specification decisions.