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Clean Room Gowning Procedure Step By Step

Cleanroom gowning procedures, and the extent to which one needs to gown up, differ depending on clean room class and application. For example in ISO Class 7 or ISO Class 8 clean rooms, frocks are often acceptable. However in ISO Class 5 or ISO Class 6 (or cleaner) clean rooms: coveralls, hoods, gloves, and shoe covers (also known as booties) are required. Caution should be observed to assure that no sterile surfaces contact non-sterile surfaces during gowning, processing, cleaning or packaging.

The following table indicates which garment elements are recommended for each specific class of clean room.

Table 1: ISO Level Requirement Table

Product ImageISO 8

Class 100,000


Class 10,000


Class 1,000


Class 100


Class 10

Face Masks / VeilsSuggestedSuggestedSuggestedYesYes
Beard CoversYesYesYesYesYes
Hair NetsYesYesYesYesYes
Shoe CoversSuggestedYesYesYesYes
Boot CoversSDSDSDSuggestedYes
Coverall SuitSDSDSDYesYes
  1. Yes – Recommended (per IEST standards)
  2. NR – Not recommended (per IEST standards)
  3. SD – Situation dependent / Application specific (per IEST standards)
  4. Suggested – Suggested based on the collective experience by the working group
particle size analysis

A Basic Gowning Procedure

  1. Wash and dry hands thoroughly; remove all jewelry.
  2. Bouffant Cap – Use a bouffant cap to completely cover your hair.
  3. Cleanroom Sticky Mat – Walk on the mat to remove dirt from your shoes, and roll any carts entering the cleanroom over the mat.
  4. Shoe Covers – Place your shoe cover over your entire shoe and cover your laces.
  5. Cleanroom Gloves – Some cleanrooms require that you use gloves while dressing. If that is required, then this will be the first of two sets.
  6. Face Mask – Bend so that your mask fits comfortably on your face
  7. Hood – Put a hood over your mask and ensure that your face/neck seal is not exposed
  8. Coverall – Step into your coverall, making sure that your sleeves and upper garment do not touch the floor or walls. Tuck your hood panels inside your coverall before zipping up
  9. Boot Covers – Place the first boot cover over the leg of your coveralls.  Put on your boot, and step that foot into the “clean” side of the gowning area. Place the other boot cover over your other leg before completely entering the “clean” side.
  10. Eye Protection – Put on goggles if your cleanroom requires eye protection.
  11. Cleanroom Gloves – If the second set of gloves are required, put on over the first set of gloves or remove first set and then put on cleanroom gloves. Make sure gloves cover the cuff of the sleeve.

Clean room gloves are worn for one of two reasons: to protect the wearer from exposure to dangerous or irritative substances, and/or to protect cleanroom products from contaminants introduced through operators, equipment, or airborne particles.

Pharmaceutical manufacturers will generally require sterile gloves with clean room designated packaging. Clean room glove packaging features a polyethylene, easy open packaging which is washed with deionized water, assembled, and then packaged for delivery inside a cleanroom.