Precision Optical Mold Polishing
Delivering exceptional surface finishes for optical polymer moulds through precision craftsmanship, technical expertise and uncompromising quality.
Founded on precision. Built on trust.
STMoldes is a Portuguese company founded in 2018, based in Marinha Grande, in the Leiria district, the historic heart of Portugal’s mould-making industry.
We specialise in polishing high-precision optical moulds for polymer injection, delivering customised solutions that meet the highest optical quality standards.
Our experienced team combines technical expertise, precision craftsmanship and customer-focused service to help manufacturers produce outstanding optical components.
Polishing is carried out at our own workshop; in occasional cases, we travel to the client's premises.
Services
Optical Mold Polishing
Ultra-high-quality polishing for optical injection moulds requiring exceptional transparency and surface finish.
Mirror Finishing
High-gloss finishing with nanometre-level surface quality.
Precision Surface Correction
Removal of micro-defects while maintaining dimensional accuracy.
Custom Polishing Solutions
Tailored processes according to project requirements, with quotes prepared in person or remotely from photos and technical drawings.
Aeronautic Polishing
High-precision polishing for aeronautical components and moulds, meeting strict surface finish and tolerance requirements.
Capabilities
Turnaround Time
Average lead time of one week, depending on mould geometry complexity.
Capacity
Moulds up to 12 tonnes.
Materials
Steel, treated steel and aluminium.
Quotes
Quotes prepared in person or remotely, from photos and technical drawings of the mould.
Craftsmanship in every surface
Process
Consultation
Understanding your technical requirements and project goals.
Technical Analysis
Detailed assessment of mould geometry and surface specification.
Precision Polishing
Meticulous, multi-stage polishing to the required optical finish.
Quality Inspection
Rigorous surface and dimensional verification.
Delivery
On-time handover, ready for production.
Industries
High-clarity lenses and light guides for headlamp and signal systems.
Optically critical components for diagnostic and imaging equipment.
Precision optics for displays, sensors and connected devices.
Lenses, prisms and light guides demanding flawless transparency.
Technical mould components across demanding production environments.
Metal die-casting moulds requiring durability and precision under high-pressure production.
Quality without compromise
Let’s discuss your project
Send photos or technical drawings of the mould for a quick quote, or schedule a visit to our workshop.