GPA 2108-20通常将天然气液体（NGL）的物理性质和特性定义为分馏设施的原料和产品，使其适用于私人、商业和工业应用。这些规范并不旨在明确定义满足所有可能应用的所有可能要求。因此，建议用户在制定特定应用的最终规范时进行判断。NGL有许多用途，包括精炼、石化和加热。本标准所代表的七种NGL规范包括脱甲烷混合规范和分馏级规范，其中包括乙烷、乙烷- 丙烷混合物、丙烷、异丁烷、正丁烷和天然汽油。

GPA 2108-20 generally defines physical properties and characteristics of natural gas liquids (NGL) as a feedstock to and products from fractionation facilities which make them suitable for private, commercial, and industrial applications. These specifications do not purport to specifically define all possible requirements to meet all possible applications. Therefore the user is cautioned to exercise judgment in formulating final specifications for specific applications.There are many uses for NGLs including refining, petrochemical, and heating. The seven NGL specifications represented by this standard include a demethanized mix specification and fractionation grade specifications which include ethane, ethane-propane mix, propane, iso-butane, normal butane, and natural gasoline.