When it comes to reviewing job bids for cleanrooms, comparing the proposals can be a lot of work. If you don’t have everyone on the same page as far as what you want, and if sketches aren’t consistent, it will be really tough to fairly evaluate all the bids. To ensure that you can make the best decision, here are several tips as to how navigate this process.
An accurate bid depends on a thorough specifications sheet. Your first step is to create one of these for all your bidding contractors to work from. It ensures that they know exactly what you need, and it helps you make an “apples to apples” comparison of their proposals. Here is what you need on this sheet:
Your room’s classification.
Temperature specs and tolerance.
Humidity specs and tolerance. Humidity control is the most expensive part of … Read More »
The individual classes of cleanrooms will dictate many specifics regarding the types of materials allowed in a controlled environment. For example, required garments and acceptable garment materials vary by class. The same is true for solvents. Then there are every day items that are generally prohibited in any cleanroom. Some of these items are available in a cleanroom-approved form. It is imperative that these approved items are used and never substituted with every day items. Here is a general breakdown of things you don’t want in your cleanroom and also which items can be found cleanroom-approved.
Food and drink
Regular writing utensils
Regular paper or notebooks
Books and bookbags
Greases, oils, lubricants
Any unapproved tape or adhesive
Open cell foam materials
Commercial vacuum cleaners (or other unapproved cleaning equipment)
As you can probably gather by reading the list, several of these … Read More »
Electronics manufacturers have a few things to consider when determining how to best clean electronics. These include the cleaning solvent, equipment, and whether to use a wet or dry process. Here is a short breakdown of these considerations.
The right cleaning agent depends on what you’re removing and what it’s stuck to. Doris Schulz of Controlled Environments describes in “Cleaning in Electronics Manufacturing” the kinds of cleaning agents used in this industry. “Cleaning agents currently used in electronics manufacturing include solvents, water-based media containing alkaline surfactants, and water-based tenside-free cleaning agents.”
She also explains that solvents contain modified alcohols, non-halogenated hydrocarbons, or hydrofluorethers (HFEs).
Monosolvent systems usually use an azeotrope or pure HFE to remove:
Residue of easy clean solvent
Other slight impurities
Cosolvent systems combine an HFE with a low-volatility organic solvent. Bisolvent systems are similar but the solvent and rinsing … Read More »
As anyone who does or will operate a cleanroom probably knows, that room and all of its pieces have to meet a specific set of class standards. Certification is a major part of compliance, and all cleanrooms need it done. What exactly does that mean, though?
Basically, cleanroom certification is a pass/fail test based on the standards set forth by The National Environmental Balancing Bureau (NEBB). The organization’s Procedural Standards for Certified Testing of Cleanrooms constitutes a “uniform and systematic set of criteria for the performance of cleanroom testing and certification.” A true cleanroom certification refers to the ISO 14644-1 classification test. Put most simply, its documents are concerned with airborne particle contamination within the cleanroom. Passing the test means that the airborne particles were within the set limit for the class.
NEBB’s manual contains the minimum requirements to follow for … Read More »