Document bd96LKwbxOENpXk1geO08Ywo

E. H. BERG - MARSHALL LAB. R. W. LAURRELL - MARSHALL LAB. P. M. GAVIN - FLINT D. M. MARSH - EXP. STATION CCs G. I. Mulholland P. T. Johnson Wilmington, Delaware April 13, 1972 The MPCA Task Force on heavy metals held its organizational meeting in Cleveland on April 11, 1972. Representatives of the major paint manufacturers were present; Richard A* Moore of Sherwin-Williams is chairman of the Task Porce, NPCA intends to engage an independent laboratory to in vestigate the toxicity of metals used in paints, A three-phase program is contemplated: 1. Literature survey 2. investigate the solubility of heavy metals and their compounds {listed in attached) in synthetic and, later, natural gastric juice 3. Feeding studies as indicated by 1 and 2 The Task Force listed all heavy metals, and their compounds, believed to be of importance to the paint industry. Metals were divided Into three categories depending upon importance and likely relative toxicity as indicated in the attached. The proposed study may be limited to Group I only depending on preliminary consultations and projected costs. Please review the attached list to determine whether all compounds of importance to the F. & F. Department are included and that percentages are appropriate. your comments and/or changes to these lists by May 1 would be most appreciated. EES/bn Attach. B. E. SWAIN, JR. N38349 I. Metals whose compounds are most needed by the paint industry and whose toxicity may be suspect and for which research data is needed . Metal Compounds in Paints Max. Ex- pected %* 1. Cobalt 2. Barium Co-Ni-Ti Pigments Metallo-organic soaps Barium sulfate Barium borate 20 1 30 15 3. Lead Lead chromates Lead carbonates Lead silicates Lead oxides (Pb30^) (PbO) Lead metal Lead silicochromates 25 60 15 50 50 25 25 4. Mercury Mercury-cadmium lithopone 0.5 5. Copper Copper oxide Copper metal Metallo-organic soaps ordriers Chlorinated copper thallocyanate 25' 40 5 5 6. Antimony Antimony oxide Antimony titanates Nickel antimony titanates 10 15 15 7. Nickel Nickel titanate 15 8. Chromium Chromium oxide Lead chromates Zinc chromates 15 25 25 9. Cadmium Cadmium lithopones Cadmium selenide Cadmium-barium soaps 15 3 *% by weight of non-volatiles N38349.01 DUP050049714 II. Metals whose compounds are of equal importance but are believed to be less suspect for toxicity ____________ Metal Compounds in Paints Max. Ex- pected %* 1. Titanium Titanium dioxide Nickel titanate Nickel tungsten titanate Nickel antimony titanate Organic titanate . 50 15 2. Calcium Calcium carbonate Calcium oxide Calcium organic soaps and driers 70 trace 2 3. Magnesium Magnesium silicate Magnesium aluminum silicate Magnesium oxide 50 20 1 4. Aluminum Aluminum silicates Aluminum stearates Aluminum hydrate & oxide lakes Aluminum metal powder 50 10 5 25 ' 5. Zinc zinc oxide Zinc chromate Zinc metailo-brganic soaps Zinc powder Zinc lithopones 25 25 1 80 50 6. Molybdenum Lead molybdate Zinc molybdate 15 20 7. Lithium Lithium hydroxide Lithium traces from alcoholysis Lithium naphthenate 2 2 2 8. Boron Barium metaborate Other borates Boron trifluoride 15 15 1 9. Manganese Manganese dioxide Metallo-organic soaps 2 1 10. Zirconium Zirconium oxide Naphthenates, soaps traces 2 *% by weight of non-volatiles DUP050049715 .Ill, Metals whose compounds are of lesser importance to the paint industry (may he able to do without) Metal 1. Arsenic 2. Selenium 3. Tin 4. Strontium Compounds in Paints In cadmium lithopones Organo-tin compounds Strontium chromate Max.Ex- pected %* 25 1 25 *% by weight of non-volatiles DUP050049716