W A R N I N G S   A F F I X E D   T O L A B O R A T O R Y   D O O R S A T   T H E   M A S S A C H U S E T T S I N S T I T U T E   O F   T E C H N O L O G Y . - - - - [As a service to our readers, we will be gathering and reprinting notices posted on laboratory doors at the Massachusetts Institute of Technology. The following list of specific chemical hazards comes from the Staff and Student Chemical Safety Guidelines for polymer chemistry work at the MIT Media Laboratory's Holographic Imaging Laboratory. It appears below unaltered. (Note: if you have notices that you have found posted to doors at MIT, please email them to mcsweeneysmail@yahoo.com with "MIT Doors" in the Subject header.)] - - - - 2.4 Specific Chemical Hazard Below is a list of the chemicals used in polymer chemistry. Also listed are the associated hazards of each chemical. Oil     Silicone Oil - Do not inhale or swallow. Avoid contact with skin or eyes. Surfactants     Tween 20 - Do not inhale or swallow. Avoid contact with skin or eyes. Diacid Chlorides     Sebacoyl Chloride - A component of polymers. Corrosive -- causes burns. Irritating to eyes and respiratory system. Lachrymator. Moisture sensitive.     Adipoyl Chloride - A component of polymers. Corrosive -- causes burns. Irritating to eyes and respiratory system. Lachrymator. Reacts violently with water. Diamnines     Hexamethyldiamine - Polymer Building block. Corrosive -- causes burns. Harmful by inhalation, in contact with skin and if swallowed. Target organ: Liver. Buffers     Sodium Hydrogencarbonate - Moisture sensitive -- keep tightly closed. Avoid eye and skin contact.     Sodium Carbonate - Irritant. Causes severe irritation. Do not breathe dust. Solvents     Methanol - which should only be used under the fume hood. Avoid skin contact and vapors. Methanol is also very flammable keep away from open flame or high temperature.     Isopropanol - a concentrated rubbing alcohol is sometimes used in the lab. Avoid unprotected contact Isopropanol is also flammable. Other Chemicals     Cyclohexane - Highly flammable. Harmful by inhalation or if swallowed. Irritating to eyes and respiratory system and skin. Target Organs: Lungs and central nervous system.

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