ABS AB or ABS ABA refers to the Co-extrusion of ABS.
Co-extrusion is the process of pressing two or more materials through the same Extrusion die to produce a single piece of sheet or roll with different layers fused together. When multiple plastics are combined, the result can produce properties distinct from those of a single material and can create a different colour layers of the same material.
ABS AB refers to ABS base(A) a Top Coating(B).
For Example a Recycled material can be use in the base of the material and Virgin material can be used as a Top Coating.
ABS ABA refers to a Top Coating(A), ABS Base(B) and Bottom Coating(A)
Where (A) is the same material on both Coatings