Nanolab Safety Notes

If area is exposed to HF or BOE, take off clothes, wash exposed area for at least 5 minutes and notify lab management. Then use a special calcium gluconate cream. Wear gloves when applying the gel to avoid transfer of HF. Concentrated solutions of HF cause immediate pain.

HF etches glass, so it should not be kept in a glass bottle.

Don’t add water to an acid or base. Instead add a base or acid to water. When you add water to acid, the reaction is exothermic, meaning heat is released. The water evaporates and can splash acid onto you. For this reason always pour acid in water for dilutions. Do not add water to sulfuric acid, always add acid to water slowly.

Don’t mix solvents and acids. Always work with acids or solvents in an exhausted hood.

Pyrophoric – chemicals that spontaneously ignite in air. React spontaneously when exposed to oxygen. Silane is a pyrophoric gas.

Flash point – minimum temperature of a liquid at which it gives off sufficient vapor to form an ignitable mixture with air. Liquids with a flash point near room temperature can be ignited very easily.

Exothermic – a reaction in which heat is produced

Acute exposure -short term exposure (like from a chemical spill)

Chronic exposure – long term exposure (result of carelessness, ignorance or accident).

Acute and Chronic exposure have nothing to do with the severity of the exposure.

Local exposure – exposure limited to a small area of skin or mucous membrane

Systemic exposure – exposure of the whole body of system through adsorption, ingestion, or inhalation.

Threshold Limit Value (TLV) – average level to which you can be exposed 8 hours a day, 5 days a week  forever without adverse health effects.

IDLH – Immediately dangerous to Life and Health – the level represents the maximum value for which a 30 minute exposure will result in no irreversible or escape impairing effects.

STEL – short term exposure limits – maximum concentration to which you can be exposed for 15 minutes, up to 4 times a day without adverse effects.

Carcinogen – a substance producing or inciting cancerous growth

Mutagen – capable of inducing mutations

Teratogen – a substance causing damage to a fetus

Acetone – flammable solvent with a low flash point.

Spilled solvents should be contained immediately with spill control pillows.

In the case of an HF burn, medical attention is needed (including deep injections to neutralize the acid). Make sure medical personnel know it is an HF burn.

If you can smell resist in the resist room, something is wrong. Always wear the proper protective equipment and work in a well ventilated area at all times when dealing with photoresists.

If the toxic gas alarm sounds, evacuate the building via the nearest emergency exit

Do not loiter near the Toxic Gas Bunker even when there is no emergency

Do not attempt to enter the toxic gas room.

The following must be worn in the cleanroom at all times: hairnet or bouffant cap, eyeglasses, safety glasses, or goggles, face mask, gloves, cleanroom gown or jumpsuit, show covers or cleanroom boots.

When working with chemicals in the cleanroom, you have to wear a chemical apron or smock(supplied by nanolab), chemical visor or face shield(supplied by nanolab), and chemical resistant gloves (supplied by user).

No food or drink in nanolab, no pencils, wood, cardboard, or any other material that will continuously shed particles.

MSDS – Materials Safety Data Sheet

Chlorine – has a choking odor, causes severe tissue damage in lungs.

Anhydrous ammonia – high concentrations can be suffocating.

Liquid Nitrogen – more people die of asphyxiation by nitrogen than by any of the other toxic gases.

Phosphine – pulmonary irritant and poison.

Acetone – very flammable solvent with low flash point. Spilled solvents should be contained immediately with spill control pillows.

Piranha etch – heated mixture of hydrogen peroxide and sulfuric acid. When disposing of piranha (or any hydrogen peroxide solution), use a waste bottle with a vented cap, since the waste continues to react and decompose for a long time. Allow piranha solutions to cool to room temperature before pouring into a waste container.

Chlorinated Solvents – can cause cancer or organ damage. They should not be mixed with normal solvents in waste bottles. They do not rinse well from bottles and glassware, so to properly remove the solvent residue from the containers, the container should be thoroughly rinsed with Isopropanol.

Glycol Ethers – can cause birth defects, infertility.

When disposing of peroxide solutions – use a waste bottle with a vented cap, since waste continues to react for a long period of time.

If after using the nanolab you experience unexplained health effects such as difficulty breathing, asthma, rashes, or other symptoms that cannot be explained, you should notify the nanolab staff. If symptoms are severe, you should immediately seek medical attention, and inform the medical personnel which chemicals and processes you may have been exposed to.

Open containers or containers with unattached lids may not be carried around the lab, even if they only contain water.

When pouring wet chemicals in a fume hood, always wear a face shield, chemical apron, thick chemical resistant gloves.

If a solution is to be heated, only use a glass container. If using a HF acid containing solution, only use a plastic or Teflon container.

Everything, even water must be labeled.

Label using cleanroom tape.

Every label must have:Full Chemical Name and Concentration, Username, Date, Time Started, Time of Anticipated finish, Phone number if you are going to leave the cleanroom.

Only glass containers should be used on hotplates. HF acid solutions are never to be heated on hotplates.

Storing chemicals -  label with chemical name, professor, date chemical was brought into lab.

For a minor spill you should: wear an apron, visor and chemical gloves, turn off any hotplate or heat source, neutralize the spill if it contains acids or bases, contain the spill and soak up with spill pillows or wipes, place an appropriately filled out chemical waste label on the bag, place contaminated materials into a chemical waste bag and seal the bag, treat the chemical waste bag as hazardous waste and store on the appropriate shelf in the chemical waste cabinets, notify staff of the spill.

For a major spill, call for evacuation of the lab, call EH&S and wait outside lab entrance to tell emergency responders of the location and type of spill.

In the case of a fire or toxic gas alarm, take 10 seconds to secure tool you’re working on, walk to nearest exit, and meet at front of building away from toxic gas bunker.

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