Transparent PP parts: transmission is only part of the appearance

Injection production note

For a transparent tank or container, weld lines, flow marks, wall variation and mould finish all affect what the customer sees. A transmission figure cannot describe how the finished part looks from different angles or after filling.

We inspect the complete part under agreed lighting and compare it with a retained reference. Haze and gloss data are useful, but they are read together with flow behaviour, stiffness, release and the thickness distribution of the actual moulding.

Agree on the visual reference before sampling

Send the current resin, part drawing or photographs, wall thickness, moulding temperature and an approved sample if one exists. Mark the areas that matter most to the customer so the trial does not improve one zone while overlooking another.