### 2.1.2. Material Data

ACP differentiates between four material classes: Materials, Fabrics, Stackups and Sublaminates.

- The Materials class is the material database in ACP.

- The Fabric class is where Materials can be associated with a ply of a set thicknesses.

- The Stackup class is used to combine fabrics into a non-crimp fabric, such as a [0 45 90] combination.

- The Sublaminate class is used to group fabrics and stackups together for frequently used lay-ups.

A Stackup or a Sublaminate can only be defined if a fabric and material have been defined previously.

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