GRAIs or Global Returnable Asset Identifiers are used to uniquely identify a returnable asset.

A Returnable Asset is a reusable package or transport equipment of a certain value, such as a beer keg, a gas cylinder, a plastic pallet, or a crate. The GS1 System identification of a Returnable Asset, the Global Returnable Asset Identifier (GRAI), enables tracking as well as recording of all relevant data.

GRAI has an overall structure variable length up to 30 alpha numeric characters which is comprised of a mandatory, fixed length, asset type identification and an optional, variable length, serial number. The GRAI is is assigned for the life time of the asset and may be bar coded using Application Identifier (8003).

The GRAI is constructed as follows:

 GS1 Company Prefix >     < Asset ReferenceCheck
Serial Number
X1 variable X16

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