Cleanroom injection moulding: Class 7 vs Class 8 – What is the difference?
For manufacturers of medical devices, diagnostics and pharmaceutical products, selecting the right cleanroom classification is critical. The wrong choice can increase cost, delay validation and create unnecessary compliance risks. While cleanroom injection moulding is essential for controlling contamination, not all cleanrooms offer the same level of environmental control.
The two most common classifications used in medical manufacturing are Class 7 and Class 8 cleanrooms. Understanding the differences can help businesses choose the right environment for their products and regulatory requirements.
What is cleanroom injection moulding?
Cleanroom injection moulding involves producing plastic components in a controlled environment where airborne particles, temperature, humidity, and contamination risks are carefully managed.
This is particularly important for medical and healthcare applications where even small amounts of contamination can impact product performance, safety or compliance.
Key features of a cleanroom environment include:
- HEPA-filtered air systems
- Controlled airflow and pressure
- Strict gowning procedures
- Environmental monitoring
- Validated manufacturing processes
What do ISO cleanroom classifications mean?
Cleanrooms are classified according to ISO 14644-1, which measures the concentration of airborne particles within a controlled environment.
The lower the ISO number, the cleaner the room and the stricter the particle control. For medical injection moulding, Class 7 and Class 8 are the most widely used standards.
Class 7 Cleanrooms
A Class 7 cleanroom provides a higher level of contamination control and is typically used for products that require stringent cleanliness standards.
Common Applications
- Medical devices – direct patient contact
- Diagnostic components
- Implantable device parts
- Patient-contact products
- High-risk healthcare applications
Benefits
- Reduced particle counts
- Higher level of contamination control
- More rigorous environmental monitoring
- Supports regulatory requirements
- Ideal for critical and high-risk medical components
Class 8 Cleanrooms
A Class 8 cleanroom offers a controlled manufacturing environment with less stringent particle limits than Class 7.
While still highly regulated, it is often suitable for lower-risk products and high-volume production.
Common Applications
- Medical packaging
- Assembly operations
- Non-critical medical components
- Secondary manufacturing processes
Benefits
- Controlled and compliant manufacturing environment
- Lower operating and setup costs
- Efficient for high-volume production
- Suitable for non-critical or lower-risk applications
Class 7 vs Class 8: At a glance
| Feature | Class 7 | Class 8 |
| Cleanliness Level | Higher | Lower |
| Particle Control | More stringent | Moderate |
| Typical Applications | Medical devices, diagnostics | Packaging, assembly |
| Monitoring Requirements | Extensive | Standard |
| Operating Costs | Higher | Lower |
Typical selection guidance:
- Class 7 is typically selected for critical, patient-contact or high-risk applications
- Class 8 is typically used for packaging, assembly or lower-risk components
Which cleanroom classification is right for you?
Selecting the right cleanroom classification depends on your product’s risk profile and regulatory requirements. In practice:
- Products with direct patient contact or high contamination sensitivity typically require a Class 7 environment
- Secondary processes such as packaging or assembly are often suitable for Class 8
- Regulatory expectations, sterilisation requirements and material behaviour should always be assessed early in development
Products with direct patient interaction or strict cleanliness requirements typically require an Class 7 environment, while many packaging and assembly operations can be effectively manufactured in an Class 8 cleanroom.
Why manufacturing expertise matters
Cleanroom classification is only one part of successful medical manufacturing. Equally important is a robust quality management system, such as ISO 13485, which helps ensure traceability, validation, regulatory compliance, and consistent product quality throughout the product lifecycle.
Partnering with an experienced global manufacturing organisation can provide significant advantages when bringing medical and healthcare products to market. Rosti Group operates 13 manufacturing sites across Europe, Asia, and North America, giving customers access to a truly global production footprint. With strategically located Class 7 and Class 8 cleanroom facilities, supported by certified quality systems and extensive medical manufacturing expertise, Rosti can provide the flexibility, scalability and reliability needed to support a wide range of healthcare and life sciences applications.
Selecting the right cleanroom strategy is not only about compliance, but about balancing quality, efficiency and long-term scalability.
Both Class 7 and Class 8 cleanrooms play an important role in cleanroom injection moulding. Class 7 offers the highest level of contamination control for critical medical applications, while Class 8 provides a cost-effective solution for lower-risk products and processes. Selecting the right cleanroom environment helps manufacturers balance compliance, quality, efficiency and cost while ensuring products meet the demands of today’s healthcare market.
Whether you are developing a new medical device, scaling production or reviewing your cleanroom manufacturing strategy, Rosti’s global team can help identify the most suitable manufacturing solution for your requirements.
Not sure whether Class 7 or Class 8 is right for your product? Our team can support you in assessing product risk, regulatory requirements and production strategy to define the most efficient and compliant solution.
