Clean Room Environment Control

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A clean room is a basically a room where the amount of particles is controlled. A class 100 clean room has no more than 100 particles in any given cubic foot of air. That’s the standard used by hard disk manufacturers themselves.

If the hard disk needs to be opened up, one has to do it within a clean room. The gap between the Read-Write head and the data platter is just a few microns. Any dust particles that get into the gap will induce “crashing” of the Read-Write head onto the data platter (where your magnetic data bits are stored) resulting in total and permanent loss of data.

What makes cleanroom environment fail?

* Facilities

Walls, floors and ceilings

Paint and coatings

Construction material (sheet rock, saw dust etc.)

Air conditioning debris

Room air and vapors

Spills and leaks

* People

Skin flakes and oil

Cosmetics and perfume

Spittle

Clothing debris (lint, fibers etc.)

Hair

* Tool Generated

Friction and wear particles

Lubricants and emissions

Vibrations

Brooms, mops and dusters

* Fluids

Particulates floating in air

Bacteria, organics and moisture

Floor finishes or coatings

Cleaning chemicals

Plasticizers (outgasses)

Deionized water

* Product generated

Silicon chips

Quartz flakes

Cleanroom debris

Aluminum particles

Cleanroom Control Regulations for reference

1.  All personal items such as keys, watches, rings, matches, lighters and cigarettes should be stored in the personal locker outside the gowning room.

2.  Valuable personal Items such as wallets may be permitted in the cleanroom provided they are NEVER removed from beneath the cleanroom garments.

3.  NO eating, smoking or gum chewing allowed inside the cleanroom.

4.  Only garments approved for the cleanroom should be worn when entering.

5.  NO cosmetics shall be worn in the cleanrooms. This includes: rouge, lipstick, eye shadow, eyebrow pencil, mascara, eye liner, false eye lashes, fingernail polish, hair spray, mousse, or the heavy use of aerosols, after shaves and perfumes.

6.  Only approved cleanroom paper shall be allowed in the cleanroom.

7.  Approved ball point pens shall be the only writing tool used.

8.  Use of paper or fabric towels are prohibited. Use of hand dryers equipped with HEPA filters are suggested.

9.  Gloves or finger cots should not be allowed to touch any item or surface that has not been thoroughly cleaned.

10. Only approved gloves, finger cots (powder-free), pliers, tweezers should be used to handle product. Finger prints can be a major source of contamination on some products.

11. Solvent contact with the bare skin should be avoided. They can remove skin oils and increase skin flaking.

12. Approved skin lotions or lanolin based soaps are sometimes allowed. These can reduce skin flaking.

13. All tools, containers and fixtures used in the cleaning process should be cleaned to the same degree as the cleanroom surfaces. All of these items are a source of contamination.

14. NO tool should be allowed to rest on the surface of a bench or table. It should be place on a cleanroom wiper.

15. Only cleanroom approved wipers are allowed to be used. The wipers must be approved for the Class of cleanroom being cleaned.

16. ALL equipment, materials and containers introduced into a sterile facility must be subjected to stringent sterilization prior to entrance.

17.NO ONE who is physically ill, especially with respiratory or stomach disorders, may enter a sterile room. This is a good practice in any cleanroom environment.

Personal Actions Typically Prohibited in Cleanrooms

1. Fast motions such as running, walking fast or horseplay.

2. Sitting or leaning on equipment or work surfaces.

3. Writing on equipment or garments.

4. Removal of items from beneath the cleanroom garments.

5. Wearing the cleanroom garment outside the cleanroom.

6. Wearing torn or soiled garments.

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