Injection Moulding of clear parts
The issues relating to the use of injection moulding are just as applicable to the production of clear parts with the need to pay additional attention to the mould surface finish, split line, injection and ejection points.
The mould finish dictates the surface condition of the moulding and as such a high grade polish is required if clear parts are the intended outcome. This carries a cost and a time to implement so it is not unusual to produce first samples with limited polishing, such that the other issues of form and fit can be validated before the final polish is applied.
With a clear part, it is impossible to hide ejection marks on the rear of a surface, so split lines, ejection and injection locations must all be discussed early to ensure they are as discretely located as possible.
Finally there is material selection, this is a subject in its own right and the best general advice is to (a) ensure the desired grade is available where the moulding is being undertaken, (b) preferably by a moulder with experience of that material family, and (c) utilise online resources such as Matweb to ensure the correct material properties are achieved.
Full details for this process can be viewed on the injection moulding of plastic parts page.