At SNF, we define the Primary Hazards for each of the liquid chemicals or chemical mixtures that is handled at the wet benches. Although virtually all the chemicals at SNF pose a health risk due to inhalation, according to standard laboratory practice all direct chemicals handling must take place in properly exhausted areas. So, the Primary Hazards are the concerns (other than inhalation, which is a given) that the wet bench user must be aware of when handling these chemicals. Handling risks include contact with skin, mixing with other chemicals, contact with combustibles like cleanroom wipes, etc. -- in general, things that should be avoided at all costs, but may happen when, for example, a beaker is tipped over.

The Primary Hazards as described here should noted on the "In-use Hazardous Materials" blue card which is required for any container (other than designated hot pots or tanks.) The Hazard classes are as follows:

1= Corrosive
2= Flammable
3=Oxidizer
4=Air/Water Reactive
5=Toxic
6=Non-hazardous

1. "Corrosive" is used to describe acids and bases; direct contact with skins will usually results in burns. Never mix with flammables.
2. "Flammable" generally covers most all solvents. These should never be mixed with corrosives or oxidizers.
3. "Oxidizer" generally covers chemicals which have oxygen as an elemental component; thus, they sustain fires by providing a nice, ready supply of oxygen. Never mix with flammables.
4. "Air/Water Reactive" generally means that heat is generated when this chemical is mixed with air and/or water. Corrosive/oxidizing acids are included in this hazard class.
5. "Toxic" indicates that even low levels of direct exposure pose a health risk.
6. "Non-hazardous" is generally used to refer only to water.