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Comparison table of cleanliness requirements of various industries
Industries Applicable field Cleanliness (Class)
Optical industry Optical lens, scale engraving, Medical camera, Lens bonding process, Camera assembly, 100100~100,000
Precision Machinery Industry Optical lens, scale engraving, Medical camera, Lens bonding process, Camera assembly, Micro-scaled imaging, Lens grinding process, Coating, Film manufacturing and drying. Electrical contacts, Mini-bearings, Precision induction devices, Electronic clock components, Precision components, Instruments, Bearings, Clocks & Watches assembly and inspection. 100100~100,000
Electronic & Electric industry Crystallization & Refining of the semiconductor industry, Etching process, Position adjustment, Surface treatment, Metal evaporation, Integrated circuit, Picture tube, Video recorder, Computer tape, Computer manufacturing, Relay. 100100~100,000
Printing industry Precision platemaking, Electronic platemaking 10~100100~100,000
Mushroom cultivation Cultivation of Shiitake fungus, Mushrooms, Agaric. 10,000
Breeding Prevention of Mold/Fungus contamination. 10,000
Meat processing industry Milk products manufacturing, Fish cakes, Ham, Mushroom manufacturing, Beverage bottling and capping. 10,000
Hospital & Medical Sterile operating room, Sterile room, Storage of surgical instruments, Premature infant care, General operating room, Intensive care ward, Pharmacy room, Postoperative Intensive Care Unit/Anesthesia Recovery Room 100~100,000
Clinical Examination Cultivation of bacteria, mold/fungus, tissue, etc. 10~100100~100,000
Pharmaceutical Antibiotic, Injection and its sealing bottle, Serum fabricate, Medicine tableting, Blood dispensing, Injection syringe, Bandage, Cosmetics manufacturing. 1001,000~100,000
The clean room has certain specifications for the maximum allowable amount of fine dust particles in a certain space according to different grades. The most commonly used specifications in international standards are Fed-Std-209E
U.S. Federal Standards - 209E Clean room specifications
Grade limit  
Grade name 0.1μm
Volume unit
0.2μm
Volume unit
0.3μm
Volume unit
0.5μm
Volume unit
5μm
Volume unit
SI Imperial m3 ft3 m3 ft3 m3 ft3 m3 ft3 m3 ft3
M1 350 9.91 75.7 2.14 30.9 0.876 10.0 0.283 - -
M1.5 1 1,240 35.0 265 7.50 106 3.00 35.3 1.00 - -
M2 3,500 99.1 757 21.4 309 8.75 100 2.83 - -
M2.5 10 12,400 350 2,650 75.0 1,060 30.0 353 10.0 - -
M3 35,000 991 7,570 214 3,090 87.5 1,000 28.3 - -
M3.5 100 26,500 750 10,600 300 3,530 100 - -
M4 75,700 2,140 30,900 875 10,000 283 - -
M4.5 1000 35,300 1,000 247 7.00
M5 100,000 2,830 618 17.5
M5.5 10000 353,000 10,000 2,470 70
M6 1,000,000 28,300 6,180 175
M6.5 100000 3,530,000 100,000 24,700 700
M7 10,000,000 283,000 61,800 1,750
U.S. Federal Standards - 209D Clean room specifications
Series Particle size Number of particles Pressure Temperature °C Humidity % Wind speed and air exchange rate Particles
um Particles/ft3 mmAg Range Recommended value Error value Max Lowest Error value times/hr lux
1 ≧ 0.5 ≦ 1 >1.3 19.4

~25
22.2 ±2.8


special

needs


±1.4
45 30 ±10


special

needs


±5
Layer flow
0.35~0.55m/s
1,080~1,620
≧ 5.0 0
10 ≧ 0.5 ≦ 10
≧ 5.0 0
100 ≧ 0.5 ≦ 100
≧ 5.0 ≦ 1
1,000 ≧ 0.5 ≦ 1,000 Turbulence
≧20 次/hr
≧ 5.0 ≦ 10
10,000 ≧ 0.5 ≦ 10,000
≧ 5.0 ≦ 65
100,000 ≧ 0.5 ≦ 100,000
≧ 5.0 ≦ 700