ISO 25178 Surface Parameters for Injection Moulding Optical Components
ISO 25178 areal parameters define 3D optical surface texture to control stray light and guide injection moulding process windows for precision lenses.
ISO 25178-601
Meaning
International metrology standards define the nominal characteristics of contact stylus instruments used to measure the areal surface texture of manufactured parts. Within injection moulding, ISO 25178-601 establishes the technical specifications for instruments that evaluate the micro-texture and finish of mould cavities and plastic parts. The standard covers parameters such as stylus tip radius and measuring force.
Measurement Protocol
Assessment of mould inserts and moulded surfaces requires precise contact measurement to verify that the tool finish replicates correctly on the polymer. Technicians use a stylus instrument to trace the surface profile, capturing three-dimensional data that reflects the roughness and topography. Compliance with ISO 25178-601 ensures that measurements taken on different instruments or at different manufacturing sites are directly comparable.
This consistency is necessary for maintaining the slip behavior of packaging films or the optical scattering properties of plastic lenses. Incorrect stylus settings can scratch soft polymer surfaces or miss microscopic defects in the tool pattern, causing quality failures during the production run.
Tooling Interface
Surface texture of injection mould cavities directly affects the release of the moulded parts and the final appearance. Applying this standard ensures that steel or nickel coatings are evaluated accurately before tool sign-off.
Surface Quality
Precise measurement prevents errors in surface gloss and reduces friction-induced damage during ejector pin operation. Incorrectly calibrated styluses yield erroneous data that can lead to high scrap rates from demoulding defects.