PART 2 Method of calculating the total global warming potential (GWP) for a preparation

Directive 2006/40/EC of the European Parliament and of the Council of 17 May 2006 relating to emissions from air conditioning systems in motor vehicles and amending Council Directive 70/156/EEC (Text with EEA relevance) · European Union

The total GWP for a preparation is a weighted average, derived from the sum of the weight fractions of the individual substances multiplied by their GWPs. Σ (Substance X % × GWP) + (Substance Y % × GWP) + … (Substance N % × GWP) where % is the contribution by weight with a weight tolerance of +/- 1 %. For example: applying the formula to a theoretical blend of gases consisting of 23 % HFC-32; 25 % HFC-125 and 52 % HFC-134a; Σ (23 % × 550) + (25 % × 3400) + (52 % × 1300) → Total GWP = 1652,5.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-01 · Text as adopted (Official Journal); later amendments are not incorporated in this text.