How to Determine Cleanroom Classifications

A cleanroom is a controlled environment where the concentration of airborne particles is kept within specified limits according to the classification of the cleanroom. Contaminants are produced through the manufacture or other process performed there, and they are brought into the cleanroom by people and the equipment they use.

This is why using the appropriate equipment such as the cleanroom notebooks from Scientific Notebook Company is so important to maintaining the environment. Since it is impossible to prevent the release or introduction of airborne particles into the room, the air system must continually remove them according to the standards required for the classification.

Laboratory notebooks for cleanrooms

The classification of a cleanroom depends on a number of factors, including the type of industry in which it falls. Other questions that must be answered are what are the sources of contamination, the size of particles that need to be filtered out, and the amount of air needed in circulation to remove the contamination.

To control the contamination in the room, air flow rates, direction, temperature, pressure, humidity, and specialized filtering must all be considered in the air flow system and kept under control at all times.

The Significance of Particle Size on Classification

Different types of particles vary in size. To determine the classification, the engineer must determine if a specific size of particle, various sizes, or a specified range of particle sizes need to be filtered out. The standard classification for cleanrooms is assigned based on the number and size of airborne particles for every cubic meter of air in the room. The ISO cleanroom standards according to ISO 14644-1 are depicted in the table below.

CLASS                                                    MAXIMUM PARTICLES/M³                                                                 US FED STD EQUIV

≥0.1 µm

≥0.2 µm

≥0.3 µm

≥0.5 µm

≥1 µm

≥5 µm

ISO 1

10

2.37

1.02

0.35

0.083

0.0029

ISO 2

100

23.7

10.2

3.5

0.83

0.029

ISO 3

1,000

237

102

35

8.3

0.29

Class 1
ISO 4

10,000

2,370

1,020

352

83

2.9

Class 10
ISO 5

100,000

23,700

10,200

3,520

832

29

Class 100
ISO 6

1.0×106

237,000

102,000

35,200

8,320

293

Class 1,000
ISO 7

1.0×107

2.37×106

1,020,000

352,000

83.200

2,930

Class 10,000
ISO 8

1.0×108

2.37×107

1.02×107

3,520,000

832,000

29,300

Class 100,000
ISO 9

1.0×109

2.37×108

1.02×108

35,200,000

8,320,000

293,000

Room Air

Cleanroom Criteria

Cleanroom Criteria

A lot of standards are determined according to the cleanroom classification. The light fixture type, filter coverage percent, filter efficiency, types of wall system, flooring base and cover, and type of ceiling are determined according to the classification.

There are additional specifications that must be followed for any cleanroom in order to maintain the cleanliness of the environment. Clean room lab notebooks and other paper products, along with wipers, pencils, and other commodities must be screened. If specific cleanroom notebooks are introduced to the cleanroom, they should be removed from the wrapping inside the room and remain in the environment throughout their use.

Cosmetics may be banned from the cleanroom to prevent particles of sodium, silicon, or other particles from forming. Cleaning products and procedures should also be followed, specifically for Class 10,000 cleanrooms. Once the classification of the cleanroom is determined, the requirements should be followed to the letter to ensure optimal cleanliness and a controlled environment.

To learn more about our clean room paper products, call us at 800-537-3028 and make sure you maintain the appropriate environment in your cleanroom.