{"id":3963,"date":"2023-07-03T07:00:40","date_gmt":"2023-07-03T00:00:40","guid":{"rendered":"https:\/\/acccorporate.com\/www\/?p=3963"},"modified":"2023-08-30T13:46:27","modified_gmt":"2023-08-30T06:46:27","slug":"cleanroom-classifications","status":"publish","type":"post","link":"https:\/\/acccorporate.com\/www\/en\/cleanroom-classifications\/","title":{"rendered":"Cleanroom classifications"},"content":{"rendered":"\n

Cleanroom classifications<\/h2>\n\n\n\n

Cleanrooms are classified according to the number and size of particles permitted per volume of air. Large numbers like “class 100” or “class 1000” refer to FED-STD-209E, and denote the number of particles of size 0.5 \u00b5m or larger permitted per cubic foot of air. The standard also allows interpolation, so it is possible to describe e.g. “class 2000”. Small numbers refer to ISO 14644-1 standards, which specify the decimal logarithm of the number of particles 0.1\u00a0\u00b5m or larger permitted per cubic metre of air. So, for example, an ISO class 5 cleanroom has at most 105 = 100,000 particles per m\u00b3. Both FS 209E and ISO 14644-1 assume log-log relationships between particle size and particle concentration. For that reason, there is no such thing as zero particle concentration. The table locations without entries are non-applicable combinations of particle sizes and cleanliness classes, and should not be read as zero. Because 1 m\u00b3 is approximately 35\u00a0ft\u00b3, the two standards are mostly equivalent when measuring 0.5\u00a0\u00b5m particles, although the testing standards differ. Ordinary room air is approximately class 1,000,000 or ISO 9.<\/p>\n\n\n\n

<\/p>\n\n\n\n

US FED STD 209E Cleanroom Standards<\/strong><\/em><\/p>\n\n\n\n

Class<\/th>maximum particles\/ft\u00b3<\/strong><\/td>ISO
equivalent<\/th><\/tr>
\u22650.1 \u00b5m<\/th>\u22650.2 \u00b5m<\/th>\u22650.3 \u00b5m<\/th>\u22650.5 \u00b5m<\/th>\u22655 \u00b5m<\/th><\/tr>
1<\/th>35<\/td>7<\/td>3<\/td>1<\/td> <\/td>ISO 3<\/td><\/tr>
10<\/th>350<\/td>75<\/td>30<\/td>10<\/td> <\/td>ISO 4<\/td><\/tr>
100<\/th> <\/td>750<\/td>300<\/td>100<\/td> <\/td>ISO 5<\/td><\/tr>
1,000<\/th> <\/td> <\/td> <\/td>1,000<\/td>7<\/td>ISO 6<\/td><\/tr>
10,000<\/th> <\/td> <\/td> <\/td>10,000<\/td>70<\/td>ISO 7<\/td><\/tr>
100,000<\/th> <\/td> <\/td> <\/td>100,000<\/td>700<\/td>ISO 8<\/td><\/tr><\/tbody><\/table>
\u00a0\u00a0\u00a0
US FED STD 209E was officially cancelled by the General Services Administration of the US Department of Commerce November 29, 2001,but is still widely used.<\/figcaption><\/figure>\n\n\n\n

\u00a0ISO 14644-1 cleanroom standards<\/strong><\/em><\/p>\n\n\n\n

Class<\/th>maximum particles\/m\u00b3<\/strong><\/td>FED STD 209E
equivalent<\/th><\/tr>
\u22650.1 \u00b5m<\/th>\u22650.2 \u00b5m<\/th>\u22650.3 \u00b5m<\/th>\u22650.5 \u00b5m<\/th>\u22651 \u00b5m<\/th>\u22655 \u00b5m<\/th><\/tr>
ISO 1<\/th>10<\/td>2<\/td> <\/td> <\/td> <\/td> <\/td><\/td><\/tr>
ISO 2<\/th>100<\/td>24<\/td>10<\/td>4<\/td> <\/td> <\/td><\/td><\/tr>
ISO 3<\/th>1,000<\/td>237<\/td>102<\/td>35<\/td>8<\/td> <\/td>Class 1<\/td><\/tr>
ISO 4<\/th>10,000<\/td>2,370<\/td>1,020<\/td>352<\/td>83<\/td> <\/td>Class 10<\/td><\/tr>
ISO 5<\/th>100,000<\/td>23,700<\/td>10,200<\/td>3,520<\/td>832<\/td>29<\/td>Class 100<\/td><\/tr>
ISO 6<\/th>1,000,000<\/td>237,000<\/td>102,000<\/td>35,200<\/td>8,320<\/td>293<\/td>Class 1000<\/td><\/tr>
ISO 7<\/th> <\/td> <\/td> <\/td>352,000<\/td>83,200<\/td>2,930<\/td>Class 10,000<\/td><\/tr>
ISO 8<\/th> <\/td> <\/td> <\/td>3,520,000<\/td>832,000<\/td>29,300<\/td>Class 100,000<\/td><\/tr>
ISO 9<\/th> <\/td> <\/td> <\/td>35,200,000<\/td>8,320,000<\/td>293,000<\/td>Room air<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

BS 5295 cleanroom standards<\/strong><\/em><\/p>\n\n\n\n

 <\/td>maximum particles\/m\u00b3<\/strong><\/td><\/tr>
Class<\/th>\u22650.5 \u00b5m<\/th>\u22651 \u00b5m<\/th>\u22655 \u00b5m<\/th>\u226510 \u00b5m<\/th>\u226525 \u00b5m<\/th><\/tr>
Class 1<\/th>3,000<\/td> <\/td>0<\/td>0<\/td>0<\/td><\/tr>
Class 2<\/th>300,000<\/td> <\/td>2,000<\/td>30<\/td> <\/td><\/tr>
Class 3<\/th> <\/td>1,000,000<\/td>20,000<\/td>4,000<\/td>300<\/td><\/tr>
Class 4<\/th> <\/td> <\/td>200,000<\/td>40,000<\/td>4,000<\/td><\/tr><\/tbody><\/table>

BS 5295\u00a0Class 1<\/em>\u00a0also requires that the greatest particle present in any sample does not exceed 5 \u03bcm.<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"

Cleanroom classifications Cleanrooms are classified according to the number and size of particles permitted per volume of air. Large numbers like “class 100” or “class 1000” refer to FED-STD-209E, and denote the number of particles of size 0.5 \u00b5m or larger permitted per cubic foot of air. The standard also allows interpolation, so it is […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[257],"tags":[],"class_list":["post-3963","post","type-post","status-publish","format-standard","hentry","category-news-en"],"_links":{"self":[{"href":"https:\/\/acccorporate.com\/www\/wp-json\/wp\/v2\/posts\/3963","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/acccorporate.com\/www\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/acccorporate.com\/www\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/acccorporate.com\/www\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/acccorporate.com\/www\/wp-json\/wp\/v2\/comments?post=3963"}],"version-history":[{"count":1,"href":"https:\/\/acccorporate.com\/www\/wp-json\/wp\/v2\/posts\/3963\/revisions"}],"predecessor-version":[{"id":3964,"href":"https:\/\/acccorporate.com\/www\/wp-json\/wp\/v2\/posts\/3963\/revisions\/3964"}],"wp:attachment":[{"href":"https:\/\/acccorporate.com\/www\/wp-json\/wp\/v2\/media?parent=3963"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/acccorporate.com\/www\/wp-json\/wp\/v2\/categories?post=3963"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/acccorporate.com\/www\/wp-json\/wp\/v2\/tags?post=3963"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}