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20 API RECOMMENDED PRACTICE 1646 <br /> In addition to commercial labels,many organizations use labels such as those shown below. <br /> Toward the top of the label will be the chemical trade name of the hazardous material.Each <br /> colored bar or small diamond represents a different class of hazard.The hazard classes found <br /> on labels include Health,Flammability,Reactivity,and in some cases,Special Hazards.Each <br /> hazard class uses a different color and a rating scale from 0—4,with 0 representing the least <br /> hazard and 4 representing the most severe hazard. Remember, the higher the number, the <br /> greater the hazard. <br /> White <br /> Special <br /> Health(Blue) Flammability(Red) Reactivity(Yellow) Special Hazards(White) <br /> 0=No unusual hazard 0=Not combustible 0=stable Not reactive when ■ • =Water Reactive <br /> mixed with water Y Y <br /> 1=May be irritating 1=Combustible if heated I=May react if heated or mixed OX =Oxidizer <br /> with water but not violently <br /> 2=May be harmful if inhaled or 2=Combustible liquid flash point 2=Unstable or may react vio- ��� =Radioactive <br /> absorbed of 100°to 200°F lently if mixed with water <br /> 3=May be harmful.Short expo- 3=Flammable liquid flash point 3=May be explosive if shocked, <br /> sure may cause serious injury below 100°F heated under confinement or <br /> despite prompt medical treat- mixed with water COR=Corrosive <br /> ment.Full protective equipment is <br /> requ red. <br /> 4=May be fatal on short expo- 4=Flammable gas or extremely 4=Explosive material at room <br /> sure.Specialized protective equip. flammable liquid temperature ACD=Acid <br /> ment required <br /> ALK=Alkali <br /> 6.6 REFERENCES <br /> OSHA <br /> 29 CFR 1910.1200; 1926.59 Hazard Communication <br /> This standard may be obtained from OSHA's website at http://www.osha.gov/index.httnl <br /> 7 Working at Heights <br /> Minimum Required Knowledge <br /> 7.1 WORKING-AT-HEIGHT EQUIPMENT SELECTION <br /> Depending on the work to be done,the following equipment may be used for operations where the bottoms of workers'feet will <br /> be at a height greater than 6 feet. <br /> • Scaffold or wheeled scaffold erected by a competent person. <br /> • Scissors lift. <br /> • Aerial lift,cherry picker or bucket truck. <br /> • Ladders may be used to access high work areas such as roofs,canopies,etc.,as long as it is within the height limits allow- <br /> able by OSHA. <br /> • Working from ladders where the bottoms of the workers' feet will be at a height greater than 6 feet is a customer specific <br /> requirement. <br />