Tag Archives: Particle Contamination

Human-Generated Particle Contamination

particle contamination

CLEANROOM PERSONNEL Cleanroom garments cannot contain all human detritus Particles (µm) travel up through the garments toward the head Particles (µm) fall down the legs during activity Gowning SOPs and continuous training is crucial  

How Small is a Micron?*

how_small-is-a-micron

HEPA VS. ULPA IN A CLEANROOM 1. This large circle represents the cross section of a human hair, with an average visible diameter of 75μm. 2. This smaller circle, still visible to the human eye, represents a 50μm diameter particle. 3. This represents a 0.3μm diameter particle. HEPA filters remove over 99.97% 4. This represents [Read More…]

Cleanroom Socks vs Regular Socks

Cleanroom vs Avg socks

Cleanroom Socks: 22 Particles/Sock Off-The-Shelf Socks: 44,000 Particles/Sock   BCR® Cleanroom Socks provide the operator a superior cool and soft feeling for extended wear. Because of the enhanced wicking function, contact discomfort associated with wearing regular cotton or polyester socks is greatly diminished. The odor caused by foot perspiration is reduced as well as sock [Read More…]

Cleanroom Paper vs. Standard Copy Paper

cleanroom paper BCR bond

  BCR® Bond 850 100% wood pulp, synthetic latex binder Helmke Drum (particles/ft3) : 68 Na+ : 100ppm K+ : 1.7ppm Ca++ : 0.56ppm Mg++ : 0.13ppm Cl : 44ppm Standard Copy Paper 100 % wood pulp Helmke Drum (particles/ ft3) : 7200 Na+ : 1500ppm K+ : 12ppm Ca++ : 180ppm Mg++ : 61ppm Cl : 2000ppm   68ppm Vs. 7200ppm! IEST – [Read More…]

Can I Use a Cotton Swab in a Cleanroom?

no cotton swabs

Faced with the problem of removing small bits of contamination in the cleanroom, you would probably have to invent the swab if it didn’t already exist.  You would soon find that this little “wiper on a stick” would also prove invaluable in cleaning delicate mechanisms, in precision surface cleaning and in removing residues in hard-to-reach [Read More…]

Sources of Cleanroom Contamination

sources-of-contamination

SOURCES OF CLEANROOM CONTAMINATION What Are The Most Common Sources Of Contamination In A Cleanroom? People & Personnel Objects Fluids Tools Equipment Processes What Are The Most Common Types Of Cleanroom Contamination? Skin Particles Fibers Dust Grease Bacteria Viruses Metals Fungi NVRS (Non-volatile Residues) Ions Films DID YOU KNOW? Using Cheap Or Substandard Cleanroom Wipes [Read More…]

Particles on Surfaces: Part 8 – How Clean is Clean For Microelectronic Companies?

particles_on_surfaces_part_8

Let’s focus on one of the most challenging cleaning requirements for the pharmaceutical industry – cleaning equipment used to manufacture injectable materials – so called “parenteral drugs”. These materials must be made in environments that are absolutely clean and sterile, because there is no opportunity for the drugs to be sterilized after packaging – i.e. [Read More…]

Particles on Surfaces: Part 7 – How Clean is Clean For Pharmaceutical Companies?

Let’s focus on one of the most challenging cleaning requirements for the pharmaceutical industry – cleaning equipment used to manufacture injectable materials – so called “parenteral drugs”. These materials must be made in environments that are absolutely clean and sterile, because there is no opportunity for the drugs to be sterilized after packaging – i.e. [Read More…]

Particles on Surfaces: Part 6 – How Clean is Clean?

particles_on_surfaces_part_6

The surfaces have been wiped and the obvious question is:  How clean are they? Start with what you see. Do the surfaces look visibly clean?  If not, the wiping activity is not yet done. Wipe to the absence of visible soil on both the surface and the wiper. Keep wiping until the last wiper shows [Read More…]

Particles on Surfaces: Part 2 – The Ties That Bind

In Particles on Surfaces – Part 1, witness wafer and settling plate data showed that particles and bacteria (i.e. viable particles) will settle on cleanroom surfaces. From this we can infer that particles do NOT behave as hard microscopic billiard balls, striking surfaces and rebounding into the air. Rather, through inelastic collisions with the surface, they [Read More…]

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