ISO/TR 15403-2:20 06将天然气作为车辆压缩燃料的规范作为ISO 15403-1的附录。具体而言，ISO/TR 15403-2:20 06旨在满足对定量数据的要求。 关于气体成分的关键项目是水含量、硫化合物、颗粒物、高级烃、CO2、游离氧、乙二醇/甲醇、油含量和腐蚀性成分。 ISO/TR 15403-2:20 06仅适用于进入车辆燃料容器的压缩天然气。它不适用于输送到加气站的天然气。

ISO/TR 15403-2:2006 addresses the specifications of natural gas as a compressed fuel for vehicles as an addendum to ISO 15403-1. Specifically, ISO/TR 15403-2:2006 is intended to satisfy requests for quantitative data. The critical items regarding gas composition are water content, sulfur compounds, particulate matter, higher hydrocarbons, CO₂, free oxygen, glycol/methanol, oil content and corrosive components. ISO/TR 15403-2:2006 pertains only to compressed natural gas as it enters the fuel containers on the vehicle. It does not apply to the natural gas delivered to a refuelling station.