Rosti
Cleanroom Injection Moulding
Cleanroom injection moulding is the manufacture of plastic or silicone components in a controlled environment where airborne particles, temperature, humidity and pressure are tightly regulated. Unlike conventional production, cleanroom environments are classified according to ISO 14644-1, defining the maximum allowable particle concentration in the air.
The right level of control is essential
This level of control is essential for medical, diagnostic and pharmaceutical products where contamination can compromise safety, performance or compliance.
Rosti operates ISO Class 7 and ISO Class 8 cleanrooms and applies cleanroom principles throughout tooling, moulding, handling and assembly.
Our Cleanroom Capabilities
Rosti offers a flexible range of cleanroom manufacturing solutions tailored to product risk profile, regulatory requirements and application needs.
Our ISO Class 7 cleanrooms are used for high-risk components and critical medical device parts where the strictest particle control is required. For applications with lower contamination risk, ISO Class 8 cleanrooms provide an efficient and compliant manufacturing environment.
We also specialise in LSR injection moulding in cleanroom conditions. Using dedicated dosing and mixing systems with precise control of temperature, pressure and curing, we manufacture seals, membranes and flexible components commonly used in medical and life science applications.
In addition to moulding, Rosti supports both automated and manual assembly in cleanroom environments, with inline inspection and testing carried out under controlled conditions. Depending on product needs, we offer solutions ranging from controlled “white room” production through to fully ISO 14644-1 certified cleanrooms. Tight process control enables micron-level tolerances for precision components.
In addition to existing certified facilities, Rosti can design and build cleanroom environments based on customer-specific requirements. This capability is available across all Rosti sites, enabling cleanroom solutions to be tailored to product risk, regulatory needs and regional production strategies while maintaining consistent quality standards.
What Is
Cleanroom Injection Moulding?
Cleanroom injection moulding is the manufacture of plastic or silicone components in a controlled environment where airborne particles, temperature, humidity and pressure are tightly regulated. Unlike conventional production, cleanroom environments are classified according to ISO 14644-1, defining the maximum allowable particle concentration in the air.
This level of control is essential for medical, diagnostic and pharmaceutical products where contamination can compromise safety, performance or compliance.
For a deeper technical explanation, see our in-depth article:


Global Cleanroom Locations
Rosti’s cleanroom capabilities are supported by a growing global footprint, enabling regional manufacturing, dual sourcing strategies and long-term supply continuity.
In Poland, Rosti operates ISO Class 7 and Class 8 cleanrooms, including a recently expanded 360 m² Class 8 facility. In China, a new 500 m² Class 8 cleanroom includes a dedicated 300 m² precision moulding area. In the United States, new ISO Class 8 cleanrooms are being established in Wisconsin and Germantown, with over 3,000 square feet under construction to support medical and life sciences production, alongside additional Class 8 capacity in Utah. Rosti also maintains cleanroom manufacturing capability in Turkey.
This global network allows customers to align production with market requirements while maintaining consistent quality and compliance standards.

Regulatory Compliance and Validation
Rosti’s cleanroom manufacturing operates within a robust regulatory framework designed for medical and regulated industries. Our medical manufacturing facilities are ISO 13485 certified, and our cleanrooms are certified in accordance with ISO 14644-1 for air cleanliness. We support and collaborate with our customer’s classification processes.
We manufacture products and operate processes aligned with EU MDR and IVDR requirements. Rosti works in line with FDA 21 CFR 820. Full traceability supports regulatory audits and customer specific requirements, IQ, OQ, and PQ validation according to ISO norms have the same standard across all sites.
Cleanroom Facility Design
Rosti cleanroom facilities are purpose-designed to support consistent, contamination-controlled manufacturing. HEPA filtration systems are used to manage airborne particles, while positive air pressure prevents ingress of contaminants from surrounding areas.
Facilities are zoned to separate clean and non-clean activities, with defined material and personnel flows to reduce contamination risk. Machinery, tooling and materials are specified for medical production and validated for use in cleanroom environments, ensuring stability and repeatability in daily operation.

Why customers choose Rosti
Rosti offers a flexible range of cleanroom manufacturing solutions tailored to product risk profile, regulatory requirements and application needs.
- Global cleanroom manufacturing footprint with equal standards across multiple sites
- Integrated tooling, moulding and assembly
- Full automation assembly or packaging capabilities
- Regulatory support
- Regional production and dual sourcing options
- Technical supports from design stage
- “Big enough to cope, small enough to care“
