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MATERIAL SAFETY DATA SHEET Product Name: Base Seal® (Component `A', Isocyanate) MSDS-AOO4 affected zone until fire is out. Immediately withdraw all personnel from area in case of rising sound from venting safety device or discoloration of the container. Move container from fire area if this is possible without hazard. Protective Equipment for Wear positive-pressure Self-Contained Breathing Apparatus, "SCBA" Fire Fighters: and protective fire fighting clothing (includes fire fighting helmet, coat, pants, boots, and gloves). Avoid contact with this material during fire fighting operations. If contact is likely, change to full chemical resistant clothing with SCBA. This will not provide sufficient fire protection; consider fighting fire from a remote location. For protective equipment in post-fire or non-fire clean-up situations, refer to the relevant sections. Products of Combustion: Carbon Monoxide, Carbon Dioxide, Nitrous Oxide and HCN. Protective Clothing (Fire): Splash goggles. Full suit. Boots. Gloves. Self-Contained Breathing Apparatus, "SCBA", should be used to avoid inhalation of the product. Special Remarks on Fire Reacts slowly with water to produce carbon dioxide which may rupture Hazards: closed containers. This reaction accelerates at higher temperatures. Section 6: Accidental Release Measures SEE MATERIAL SAFETY DATA SHEET Section 8. Exposure controls, personal protection Small Spill and Leak: Clean-up should only be performed by trained personnel. People dealing with major spillages should wear full protective clothing including appropriate respiratory protection. Evacuate the area. Prevent further leakage, spillage or entry into drains. Large Spill and Leak: Contain and absorb large spillages onto an inert, non-flammable adsorbent carrier(such as earth or sand). Shovel into open-top drums or plastic bags for further decontamination, if necessary. Wash the spillage area clean with liquid decontaminant. Test atmosphere for MDI. Neutralize small spillages with decontaminant. Remove and properly dispose of residues. (See Section 13 for disposal considerations). Notify applicable government authorities if release is reportable. The CERCLA RQ for 4,4-MDI is 5,000 lbs. (see CERCLA in Section 15). Decontaminant: Preparation of Decontamination Solution: Prepare a decontamination solution of 0.2—0.5% liquid detergent and 3-8%concentrated ammonium hydroxide in water (5-10% sodium bicarbonate may be substituted for the ammonium hydroxide). Follow the precautions on the supplier's material safety data sheets when preparing and using solution. Use of Decontamination Solution: Allow deactivated material to stand for at least 30 minutes before shoveling into drums. Do not tighten the bungs. Mixing with wet earth is also effective, but slower. Section 7: Handling and Storage Handling: Avoid contact with the product or reaction mixture. Use only with adequate ventilation to ensure that the occupational exposure limit is not exceeded. The efficiency of the ventilation system must be Page 3 of 9 (A)