Company insight
Cleanroom classification: Why Class 7 and Class 8 are not interchangeable
For medical device, diagnostic and pharmaceutical manufacturers, the choice between a Class 7 and a Class 8 cleanroom is not a formality. Get it wrong and the consequences show up later: inflated production costs, delayed validation or a compliance gap that surfaces during an audit rather than at the design stage. Rosti Group outlines the risks.
B
oth classifications sit within ISO 14644-1, the standard that measures the concentration of airborne
particles in a controlled environment. The rule is straightforward: the lower the ISO number, the cleaner the room and the stricter the particle control. What is less straightforward, in our experience working with OEMs across medical, diagnostic and drug delivery applications, is matching that classification to the actual risk profile of the product, rather than defaulting to whichever cleanroom happens to be available.
What does this specific product require?
Class 7 cleanrooms provide the higher level of contamination control. They are the right environment for components with direct patient contact, implantable device parts and diagnostic components, where particle ingress carries clinical risk. That level of control comes with more extensive environmental monitoring, tighter gowning protocols and correspondingly higher operating costs, which is exactly why it should be reserved for applications that need it, not applied by default.
Class 7 versus Class 8 – at a glance Feature
Cleanliness Level Particle Control
Typical Applications
Monitoring Requirements Operating Costs
Class 7 Higher
More stringent
Class 8 Lower
Moderate
Medical devices, diagnostics Packaging, assembly Extensive Higher
Standard Lower
secondary manufacturing, Class 8 is often the more efficient choice, provided the product genuinely falls into the lower- risk category. A diagnostic cassette housing that never contacts the patient directly, for instance, rarely needs the same environmental control as the sensor component sealed inside it. The selection question, then, is not “which cleanroom is cleaner” but “what does this specific product require”. That depends on direct patient contact, contamination sensitivity, the regulatory pathway involved, sterilisation method, and how the material itself behaves under processing. Products with direct patient contact or high contamination sensitivity typically need a Class 7
“The selection question is not “which cleanroom is cleaner” but ‘what does this specific product require’.”
Class 8 cleanrooms operate to less stringent particle limits. They suit medical packaging, assembly operations and non-critical components, where a controlled and compliant environment matters but the highest tier of contamination control would add cost without adding value. For high-volume
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environment. Everything else should be assessed on its own merits rather than moulded to the highest available standard by default, since over-specifying a cleanroom is as costly a mistake as under-specifying one.
Cleanroom classification is also only one part of the answer. A facility can
hold the correct ISO rating and still fail a customer on traceability or repeatability if it lacks a robust quality management system. ISO 13485 certification is what ties cleanroom control to validated, auditable, repeatable production, which is ultimately what a regulatory submission depends on.
At Rosti, this is a decision we work through with customers early, because it shapes tooling, validation timelines and unit cost long before the first part is moulded. Our manufacturing network spans 13 sites across Europe, Asia and North America, with certified cleanroom capacity and ISO 13485-certified medical production at several of those locations. That geographic spread lets us match a customer’s cleanroom requirement to the right facility, rather than the facility dictating the requirement.
The broader point for manufacturers evaluating a moulding partner: ask not just which cleanroom class a supplier offers, but whether they can show you the quality system, the validation history and the process data behind it. The classification on the door means little without the evidence to back it up. ●
www.rosti.com/medical-solutions
www.medicaldevice-developments.com
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