Human personnel are the largest source of contamination in any cleanroom. Every time one of your employees takes a step, moves, or exposes a portion of their skin or clothing, they’re shedding contaminants. That’s why choosing the right types of gowning materials is so important for compliance and safety.
Most facilities use one of two primary gowning levels based on the classification of their cleanroom. Within those levels, you can also choose between disposable and reusable types of gowning garments.
This article breaks down cleanroom gowning procedures as outlined in ISO 14644, as well as the difference between ISO 5 gowning and ISO 7/8 gowning.
Two Primary Gowning Levels
The cleaner your ISO classification, the more stringent the gowning requirements. Higher classifications require your personnel to cover more of their bodies and use higher-quality garments to reduce the risk of shedding or incidental contamination.
The primary types of gowning are as follows.
ISO 7/Class 10,000 and ISO Class 8/Class 100,000
Many manufacturing facilities and food-production plants use ISO 7 and ISO 8 cleanrooms.
While facilities must prioritize effective contamination control, these classes also allow for less restrictive cleanroom gowning than higher classifications. Here are the garments you’ll typically need:
Head coverings
Beard covers (where applicable)
Lab coats
Shoe covers
Safety glasses
Disposable gloves
Many facilities use disposable polypropylene garments because they’re easier to manage and eliminate the costs associated with laundering.
ISO 5/Class 100 and ISO 6/Class 1,000
ISO Class 5 and ISO Class 6 cleanrooms require greater protection against particle generation. Personnel typically wear full-body garments that minimize exposed skin and reduce particle shedding. Required garments usually include:
Full cleanroom coveralls
Hoods
Face masks
Goggles
Boot covers
Double gloves
Most facilities stock reusable polyester garments because they generate fewer particles and maintain consistent performance after laundering. However, laundering garments represents an additional logistical and financial challenge.
Disposable vs. Reusable: Material and Cost Trade-Offs
Choosing between disposable and reusable garments is a matter of more than just purchase price. You must evaluate other factors, as well, such as contamination control, operational costs, and employee comfort. Here’s a quick comparison.
Disposable Cleanroom Garments
Disposable garments are a great choice if you have a lower-classification cleanroom or an infrequent production schedule. Common materials include Tyvek, polypropylene, and microporous film laminates.
The advantages include:
Lower cost per use
Consistent garment quality
No laundering
Faster inventory turnover
Reduced cross-contamination concerns
While the disadvantages include:
Increased waste generation
Lower breathability
Higher long-term costs for continuous operations
Disposable garments work well if you’re operating an ISO 7 or ISO 8 cleanroom. You should also keep disposable garments on hand when operating a higher classification cleanroom to accommodate visitors or short production campaigns.
Reusable Cleanroom Garments
Reusable garments are more common in higher-classification cleanrooms because they offer superior contamination control and long-term value. Common materials include continuous filament polyester, polyester-carbon blends, and Gore-Tex laminates.
Advantages include:
Exceptional durability
More comfortable during prolonged use
Lower lifetime operating costs
Improved particle containment
Disadvantages include:
Higher initial investment
Validated laundering requirements
Performance degradation after repeated washing
Reusable garments are an excellent choice if you operate an ISO 5 or ISO 6 cleanroom.
Garment Selection by ISO Classification
ISO 7 and ISO 8 cleanroom facilities often use disposable garments, while ISO 6 cleanrooms require greater body coverage, with full coveralls, hoods, and higher-performance fabrics.
ISO 5 environments require the highest level of personnel protection. Many ISO 5 cleanrooms come equipped with an air shower for additional contamination protection.
Key Garment Materials and Construction Features
Fabric selection plays a major role in contamination control. High-quality garments combine advanced materials with specialized construction techniques that decrease particle generation. Common materials include:
Continuous filament polyester for maximal particle control
Polyester-carbon blends for electrostatic discharge
Gore-Tex laminates for breathable performance
Tyvek and polypropylene for disposable applications
Choosing the right material is only half the battle. Make sure you select garments with high-performance features, such as minimal seams and low-lint thread.
Industry-Specific Considerations
You’ll encounter unique contamination challenges based on the industry you operate in. Here are some industry-specific factors to keep in mind:
Pharmaceutical: Must support USP <797> requirements
Biotech: Garments often change based on production batch
Semiconductor: Prioritize electrostatic-discharge protection
Medical Device: Validate every aspect of gowning to support regulatory compliance
Food and Beverage: Frequently operate in lower ISO classes, meaning dress codes are less stringent
Partner with a knowledgeable cleanroom expert to identify the needs specific to your industry.
Enforce Your Clean Room Dress Code With a Designated Gowning Area
CleanAir Solutions designs, builds, and implements critical clean room gowning elements that promote compliance and contamination control. Our offerings include cleanroom gowning cabinets, modular cleanrooms, shower stations, and fan filters.
Whether you need assistance designing a new cleanroom or want to modify an existing space to add elements like a gowning cabinet or air shower, our team can help. Contact us today to set up a consultation.
FAQs
What Is the Difference Between ISO 5 Gowning and ISO 8 Gowning?
ISO 5 gowning requires near-complete body coverage, with full coveralls, hoods, masks, boots, and double gloves. ISO 8 gowning typically includes lab coats, hair covers, shoe covers, and gloves because the environment allows for higher particle counts.
Can I Use Disposable Gowning in an ISO 5 Cleanroom?
Some ISO 5 operations use disposable garments designed specifically for the environment. However, many facilities invest in reusable high-performance garments because they provide better durability, particle control, and long-term value.
How Often Should Reusable Cleanroom Gowns Be Replaced?
You should replace reusable garments when you notice damage or excessive wear. Periodically inspect your reusable gowns so you can replace them before breakdown compromises your clean environment.
What Makes a Cleanroom Dress Code Different From Regular Lab Coat Requirements?
A cleanroom dress code focuses on contamination control rather than personal protection alone. Your dress code should specify which garments are required and the order in which your employees must don them.
What Should I Do if Personnel Repeatedly Violate Gowning Protocols?
Identify whether the violations are an employee issue or a procedural issue. If the problem is limited to a select group, enroll them in reeducation and training so they can correct their gowning process. If there’s a deficiency with your protocols, fix those shortcomings, then retrain everyone who’s involved with cleanroom processes.