We thought a Dictionary for commonly used Cleanroom words and phrases might be useful to people. The definitions below are approved by the IEST

If you have other word or phrases or would even like to expand upon a definition please send me an email at UK@DataCleanEurope.com

Cleanroom Dictionary

Cleanroom Definition: Cleanroom
Room in which the concentration of airborne particles is controlled, and which is constructed and used in a manner to minimise the introduction, generation, and retention of particles inside the room, and in which other relevant parameters e.g. temperature, humidity, and pressure are controlled, as necessary.

Cleanroom Definition: Clean Zone
Dedicated space in which the concentration of airborne particles is controlled, and which is constructed and used in a manner to minimise the introduction, generation, and retention of particles inside the room, and in which other relevant parameters e.g. temperature, humidity, and pressure are controlled, as necessary.

Cleanroom Definition: Work Zone
The volume within the cleanroom that is designated for clean work and which testing is required. The work zone volume if defined by an entrance plane and an exit plane normal to the airflow)where there is unidirectional airflow).

Cleanroom Definition: Temperature Control Zone
A cleanroom or portion thereof, in which temperature is uniquely controlled.

Cleanroom Definition: Installation
Cleanroom or one or more clean zones, together with all associated structures, air-treatment systems, services and utilities.

Cleanroom Definition: Cleanroom Classification
Level (or the process of specifying and determining the level) of airborne particulate cleanliness applicable to a cleanroom or clean zone, expressed in terms of an ISO class N, which represents maximum allowable concentrations (in particles per cubic meter of air) for considered sizes of particles

Cleanroom Definition: Particle
Solid or liquid object which, for purposes of classification of air cleanliness, falls within a cumulative distribution that is based upon a threshold (lower limit) size in the range from 0.1um to 5um

Cleanroom Definition: Particle Size
Diameter of a sphere that produces a response, by a given particle size instrument, that is equivalent to the response produced by the particle being measured.

Cleanroom Definition: Particle Concentration
Number of individual particles per unit volume of air

Cleanroom Definition: Particle Size Distribution
Cumulative Distribution of particle concentration as a function of particle size

Cleanroom Definition: Ultrafine Particle
Particle with an equivalent diameter less than 0.1um

Cleanroom Definition: Macroparticle
Particle with an equivalent diameter greater than 5um

Cleanroom Definition: U Descriptor
Measured or specified concentration of particles per cubic metre of air, including the ultrafine particles

Cleanroom Definition: M Descriptor
Measure or specified concentration of macroparticles per cubic meter of air, expressed in terms of the equivalent diameter that is characteristic of the measurement method used.

Cleanroom Definition: As-Built
Condition where the installation is complete with all services connected and functioning but with no production equipment, materials or personnel present.

Cleanroom Definition: At-Rest
Condition where the installation if complete with equipment installed and operating in a manner agreed upon by the customer and supplier, but with no personnel present.

Cleanroom Definition: Operational
Condition where the installation is functioning in the specified manner, with the specified number of personnel present and working in the manner agreed upon.

Cleanroom Definition: Discrete Particle Counter (DPC)
A light scattering instrument or other instrument with display or recording means to count and size discrete particles in air.

Cleanroom Definition: HEPA (High Efficiency Particulate Air) Filter
An extended-medium, dry-type filter in a rigid frame, having minimum particle-collection efficiency of 99.97% (i.e. a maximum particle penetration of 0.03%) for 0.3um particles of specified aerosol.

Cleanroom Definition: ULPA (Ultra-Low Penetration Air) Filter
An extended-medium, dry-type filter in a rigid frame, having minimum particle-collection efficiency of 99.999% for particles in the size range of 0.1um to 0.2um when tested in accordance with accepted test methods.

Cleanroom Definition: Calibrated Equipment
Test Equipment that has been calibrated in accordance with the equipment manufacturers recommendations or accepted industry practices.

Cleanroom Definition: Non-unidirectional airflow cleanroom
A cleanroom in which the filtered air entering the room or passing the through the work zone if characterised by non-uniform velocity or turbulent flow.

Such rooms exhibit non-uniform, random airflow patters throughout the enclosure.

Cleanroom Definition: Unidirectional Airflow
Airflow with a demonstrated deviation of not more that 14 degrees from straight line flow through the work zone.

Cleanroom Definition: Unidirection Airflow Cleanroom / Laminar airflow Cleanroom
A cleanroom in which the filtered air entering the room makes a single pass through the work area in a parallel-flow pattern, with a minimum of turbulent flow areas.

Unidirectional airflow rooms typically have coverage of 80% or more of the area of the ceiling (for vertical flow) or one wall (for horizontal flow) with the HEPA or ULPA filter medium or free-flow area.

Cleanroom Definition: Uniform Airflow
A unidirectional airflow pattern in which the point-to-point readings are within a relative standard deviation of 15% of the average airflow velocity for the total area of the unidirectional flow work zone.

Cleanroom Definition: Cleaning Agent
Any liquid that has the ability to aid in the removal of surface contamination, is compatible with the product and process, and does not contribute substantially to the contamination of the cleanroom.

Cleanroom Definition: Contamination
Act or result of the deposition of contaminant on a surface

Cleanroom Definition: Contaminant
Any unwanted substance present in or on a material or any surface within a clean zone

Cleanroom Definition: Controlled Environment
An environment in which parameters such as temperature, pressure, humidity, and contamination levels, are controlled with specified limits.

Cleanroom Definition: Housekeeping
Maintenance or cleaning performed to preserve the specified cleanliness of a cleanroom.

Cleanroom Definition: Particle Burden
Number of Particles in the relevant size range per unit area

Cleanroom Definition: Primary Surface
Surface that is in direct contact with the product

Cleanroom Definition: Secondary Surface
Surface that is not in contact with the product but indirectly affects the product.

Cleanroom Definition: Residue
Any substance left on a surface after cleaning

Cleanroom Definition: Surface contamination
Any unwanted substance present in or on a surface

Cleanroom Definition: Viable Particle
Particle capable of living or growing.

Cleanroom Definition: Building Shoes
A dedicated pair of shoes worn by cleanroom personnel within the defined area of the change room, cleanroom, and peripheral support areas to limit the tracking in of external contamination on street shoes.

Cleanroom Definition: Building Suit / Comfort Suit
An undergarment made of 100% polyester or other synthetic fabrics, normally similar to a two-piece jogging suit with either a pullover or zip-up top. It is worn over personal underwear and under the cleanroom garment.

Cleanroom Definition: Change Room
A facility contiguous to the cleanroom to provide for the control of the passage of personnel: donning, doffing, and storage of apparel; and storage of related supplies.

Cleanroom Definition: Doffing / De-gowning
The act of removing cleanroom garments in a controlled manner to prevent damage and unnecessary contamination of the garments

Cleanroom Definition: Donning / Gowning
The procedures followed while putting on the garment system in a precise, prescribed order and manner to avoid compromising the cleanliness and functionality of the contamination controlling protective garment system

Cleanroom Definition: Donning Gloves
An extra pair of gloves worn to protect the gowning system components from coming into direct contact with the hand to prevent the transfer of skin oil and flakes. May be worn over work gloves during gowning or used alone for gowning and replaced by work gloves after the gowning procedure.

Cleanroom Definition: Cleanroom Garments
Specially designed items of clothing that are worn to prevent or reduce the dispersion of contaminants that may be shed or released by personnel. Examples of such apparel include coveralls, footwear, shoe covers, gloves and head covers.

Cleanroom Definition: Garment System
The entire set of clothing and consumable items used to enclose the wearer and contain sources of human contamination. These items include beard covers, bouffant (hair nets), face masks, hoods, garments (including coveralls, shirts, pants, frocks or smocks), cleanroom shoes, safety shoes, shoe covers, cleanroom boots or (booties), glove liners and gloves.

Cleanroom Definition: Pre-Gowning
The required procedures between entering the building and entering the change room to begin the gowning procedure

Cleanroom Definition: Garment Processing
Procedures performed to meet cleanliness and usability specification for apparel and accessories for use in a controlled environment.

Cleanroom Definition: Mechanical Shoe Cleaner
An electrically operated device that contains rotating or oscillating brushes and a vacuum collection system. When a shoe or boot is placed into the device and slowly moved back and forth, the brushes help to remove dust and dirt from the tops, bottoms and sides of the shoe, while the vacuum system collects and contains the dirt.

Cleanroom Definition: Shoe Cover
A disposable or reusable cover worn over street shoes within defined boundaries of the change room, cleanroom and support areas to minimise the transfer of contamination from street shoes.

Cleanroom Definition: Tack Mat / Tacky Mat / Contamination Control Mat
A disposable or washable floor mat with a sticky surface, which when stepped upon, removes particles from the portion of the shoe or boot sole with which it comes in contact. Ideal size should allow both shoes come into full contact with the mat at least twice.

Cleanroom Definition: Wipe Down Station
A facility provided in a change room for the cleaning of materials that are going to be brought into the cleanroom.

Cleanroom Definition: Electrostatic Discharge (ESD)
The transfer or electrostatic charge between two bodies that have different electrostatic potentials.

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This entry was posted on Sunday, April 15th, 2007 at 3:33 am and is filed under Cleanroom, Cleanroom Dictionary. You can follow any responses to this entry through the RSS 2.0 feed. Responses are currently closed, but you can trackback from your own site.