A Clean- Room is an environment in which several parameters (like Contamination, Pressurization, Temperature & Humidity and Personnel Access) are controlled, monitored and maintained. Basically Clean- Room is an area in which the Quantity & Size of Air- borne particles are controlled in order to limit contamination.
– It is constructed & operated in a manner to control the Introduction, Generation & Retention of contaminates inside the space. Filtered air flows into the rooms through High Efficiency Particulate Air (HEPA) filters. Clean- Rooms are classified on the basis of; the amount of air- borne particles load in the room in any given time.
What is Contamination?
“Contamination is anything that can corrupt a process or render product purity by either touching or mixing with it”
A) Common Contaminants Include:
- Solids/ Liquids/ Gases.
- Organic & Non- Organic Matter.
- Air- borne & Surface Particles.
- Static Charges +/_.
B) What Causes Contamination?
- People are primary source of Contamination:
Skin flakes and oil.
2. Materials also generate Contamination:
C) How Clean- Room Contamination is measured?
Ans: It is measured by the amount of Air- Borne particles present within a cubic foot of air. Particles are measured in microns (μm). A micron is equal to 1/1,000,000 of a meter or about .00004 inches.
|Relative Size of a Micron|
|Strand of human hair||50-70 microns|
|Dust with Mite Feces||10 microns|
|Pollen||30 – 50 microns|
Important Point: Clean- Rooms are classified by the amount of micron size particles in one cubic foot of air.
Clean- Rooms are classified under the ISO Standard 14644:
– The classification is based upon the amount and size of air- borne particles in a Clean- Room in any given time.
– The ISO Standard covers 9 classes of Clean- Rooms with Class-1 being the Cleanest and Class 9 being the least clean
– ISO 5 Clean- Rooms are much cleaner than ISO 7 Clean- Rooms and more precautions to be taken to limit contamination.
– In 2001, ISO 14644-1 replaced Federal Standard 209 E as the basis for Clean- Room Classification; where Federal Standard 209 E measured 0.5 μm particles and larger. ISO 14644-1 takes into account even smaller air particles- providing a more precise basis of measurement.
– ISO 14644-1 classifies a Clean- Room based on the amount of particles ranging from 0.1 μm to over 5 μm per cubic meter (m3) of air.
ISO 14644-1 Clean- Room Standards
|CLASS||Maximum Particles/ m3|
|≥ 0.1 μm||≥ 0.2 μm||≥ 0.3 μm||≥ 0.5 μm||≥ 1 μm||≥ 5 μm|
|ISO 6||1.0 x 106||237,000||102,000||35,200||8,320||293|
|ISO 7||1.0 x 107||2.37 x 106||1,020,000||352, 000||83, 200||2,930|
|ISO 8||1.0 x 108||2.37 x 107||1.02 x 107||3,520,000||832, 000||29, 300|
|ISO 9||1.0 x 109||2.37 x 108||1.02 x 108||35,200,000||8,320,000||293,000|
– For Instance, Nano- Technology & precision micro- electronics industries often require tight control of the amount & size of air- particles in the air as well as:
- Electrical Conductivity.
- Electromagnetic Interference.
- Cleanliness of Interior Component and more…
Conversely, an enclosure to house a co-ordinate measuring machine may only require slightly cleaner air than that of an average room, as well as temperature and humidity control.
– Therefore, different classes of Clean- Rooms exist to donate how “clean” an environment has to be.
– Many “Clean- Rooms” do not need to meet any standards, but exist to improve product yield, protective sensitive equipment or control pressure.
– If individual require an ISO 3 Clean- Room or just need to control an environment, PortaFab can help to accomplish an individual’s goal.
– PortaFab offers 3 distinct modules Clean- Rooms systems:
- Clean Line.
- Fab Line.
- Pharma System.
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