Z 91

SECTION 2: Hazards identification

HAZARDOUS DECOMPOSITION PRODUCTS: Welding fumes and gases cannot be classified simply. The composition and quantity of both are dependent upon the metal being welded, the process, procedure and electrodes used. Other conditions which also influence the composition and quantity of the fumes and gases to which workers may be exposed include: coatings on the metal being welded (such as paint, plating or galvanizing); the number of welders and the volume of the worker area, the quality and amount of ventilation, the position of the welder’s head with respect to the fume plume, as well as the presence of contaminants in the atmosphere (such as chlorinated hydrocarbon vapors from cleaning and degreasing activities). When the electrode is consumed, the fume and gas decomposition products generated are different in percent and form from the ingredients listed in Section ll. Decomposition products of normal operation include those originating from the volatilization, reaction, or oxidation of the materials shown in Section ll, plus those from the base metal and coating, etc, as noted above. Reasonably expected fume constituents of this product would include: Primarily iron oxide and fluorides; secondarily complex oxides of manganese, potassium, silicon and sodium. Maximum fume exposure guideline for this product (based on manganese content) is 4.0 milligrams per cubic meter. Gaseous reaction products may include carbon monoxide and carbon dioxide. Ozone and nitrogen oxides may be formed by the radiation from the arc. Determine the composition and quantity of fumes and gases to which workers are exposed by taking an air sample from inside the welder’s helmet if worn or in the worker’s breathing zone. Improve ventilation if exposures are not below limits. See ANSI/AWS F1.1.F1.2.F1.3.F1.4 and F1.5 available from the AMERICAN Welding Society, 550 N.W. Lejeune Road, Miami, FL 33126. 1 3+8. COMPOSITION INFORMATION ON INGREDIENTS & EXPOSURE CONTROL This section covers the materials from which this product is manufactured. The fumes and gases produced during welding with normal use of this product are covered by Section 5 see it for industrial hygiene information. CAS Number shown is representative for the ingredients listed. All ingredients listed may not be present in all sizes. The term ‘hazardous’ in Hazardous Materials’ should be interpreted as a term required and defined in the Hazards Communication Standard and does not necessarily imply the existence of any hazard. INGREDIENTS: CAS No. WT. TLV PEL % mg/m3 Calcium carbonate 1317-65-3 15 10 15(dust) 5(respirable fraction) Iron 7439-89-6 10 5(respirable fraction) 10 Lithium fluoride 7789-24-4 5 2.5(as F) Titanium dioxide 13463-67-7 <5 10 15(dust) Manganese 7439-96-5 1.0 0.1 5 ceiling Silicate binder 1344-09-8 <5 none Nickel 7440-02-0 <1 1.5 1 Silicon 7440-21-3 1 10(dust) 5(respirable fraction) 3(inhalable fraction) 15(dust) Molybdenum 7439-98-7 <2 3(respirable fraction) None 10(inhalable fraction) none 0.5(resperiable fraction) 5(soluble) Chromium 7440-47-3 <5 0.5(metal) 1(metal) Cr(IV) ,inorganic, 0.05(dust) 0.005(dust) Water insoluble (as Cr) Cr(IV) ,inorganic, 0.01(dust) 0.005(dust) Water soluble (as Cr) Aluminum oxide 1344-28-1 <0.5 10 5(respirable fraction) 15(dust) Lithium 7439-93-2 <0.5 0.025 Niobium 7440-03-1 <0.5 none None Vanadium 7440-62-2 <0.5 none Carbon steel core wire 7439-89-6 55 5(resperible fraction) 10(fume) 2