Document JrOJJojvyq95GnvkmjVQGZ03a

HEDMAN .V. ! H 5 LI M i T D r r mci ; .o TlMMIN'j. CM'AniO, C^^*'OA <4** 7K 9 April 9, 1975 '.'D TO: 'v. A J ilCT : The New Jersey Zinc Co., Pirwenr. hales Division IIC~ and o c h c r n she sc os- rep 1 nee ::.fn r s Li eh reference to enquiries you received from Severn 1 of your cuscor-ors ns to how iu.i: compares with certain mineral fillers containing noi^.u-ljcstos fibres with regard to health hazards, we provide the following data for your inform.it ion: Ti.o enclosed copy of an nrricle by Mearl F. .Stanton, M.U., of the-National Cancer itute. Public Health Service, U.S. Department of Health, Hduc.it ion and t.Vif.irc, was referred to by a Senior Inspector of il.M. factory Inspectorate, U.K. Dep-,rtncnc of Hiaployment Cequivalcnt to OSIiA) . It was given to understand tliac Dr. Stanton's findings arc considered to be of validity by British government occupational health authorities. Dr. Stanton's paper can be summarized as follows: (1) Durable fibres cause cancer simply because they- arc fibres and irrespective of their paysiochcmical characteriseics. (2) Asbestos causes cancer not because it is asbestos but because of the structural characteristics,. (3) 'Hie most convincing evidence of a structural relationship to carcinogenicity is time fine, long fibres of any durable materials completely unrelated.to asbestos arc similarly carcinogcnic . (4) Any durable fibres narrower than 3 microns in diamerer* and longer than 20 Microns are far more carcinogenic than fibres shorter than 20 microns with diameters wider or narrower than 3 microns. Dr. Stanton's finding which appear to receive international acceptance, may eventual ly be reflected in new occupational health standards which include all durable fibres of certain sires, and not only asbestos fibres. Currently calcium silicate fibres arc commercially used as filler in order to avoid OSIIA asbestos regulations. Tn the light of Dr. Stanton's text, however, users of calcium silicate fibres are exposed to a definite health risk, as the table below clearly shows: i Material: II tirade:______________ Percent fibrous CALCIUM SILICATE FILLERS P-4 P-1 C-l_ i.-i* -! _ Tub" Tub- Tut" "idll" 11 Ml SERPENTINE COMPOUND lii'r M ' longer than 20 microns 3 it 30 0.093 longer than S microns 54 66 76 80 S7 | I 1.7 Average fibre Length (microns) S.S S .9 13 16 .22 jl 2.52 Ii ( i: Hires having an average length of igss than 5 microns are not considered pathogenic .) Average Diameter: Less than 3 microns for all above Materials. L. The above values for the calcium silicate fillers arc based on technical data sheets * published by a major-producer. The values for IICF arc based on results of cicccronwicroscopic average determinations of chrysotilc and fibre length distribution of HCF at 4000X magnifBcation carried out by-the Ontario Research Foundation. h'o feel these figures speak for themselves and, if Dr. Stanton's findings aro valid, indicate the relative environmental safoty of HCF. FOS-00-0000001332 HEDMAN MINES LIMITED P.o. BOX 380 TIMMINS. ONTARIO. CANADA PAN 7 E7 March 4, 197S Gentlemen: . RE: Composition of Hodman Cationic Fibro As requested, the following with tho attached Material Safety Data Sheet will certify tho composition of our material. Hodman Cationic Fibre (HCF) . tICF is a natural minoral mixture, consisting predominantly (ovor 80%] of Heardito, and possibly Antigorite. Approximately 14 porcent by weight or volume consists of tho ninoral Chrysotile, All throo minerals belong to the Serpentine family, and havo tho chemical formula of Hydrous Magnesium Silicatos. The Lieardito and Antigorite particles aro flaky, platy, or amorph, and not fibrous, .'.'either ninoral is classified as an asbestos mineral. Chrysotile, tho only fibrous sorpentino variety, is on asbestos mineral, however only tho fibros longer than 5 microns are "asbestos fibros" and subject to* OSHA and other asbestos health regulations. Tho averago fibre length of the chrysotile portion of HCF is 2.52 microns. (Medical roports, incl. Dr. Gross', as per attached, are unanimous in stating that asbestos fibres with an average fibre length below 5 microns are not pathogenic and incapablo - of causing cancor or fibrosis.} Only 1.7% of all particles in HCF are asbestos fibres. s Tho foregoing was conflrmod by a sorios of electron microscopic tests on samples of HCF by tho Ontario Resoarch Foundation during 1974. ORF's findings ore avorago values dotorainod at 4000X magnification. (ORF is an independent, non-profit Research Institute co-sponsored by tho Ontario government. It has developed tho world's mast sophisticated and reliable techniques to determine asbestos concentrations in water, air and solids, and is therefore under contract to various govomment agoncles, including EPA in U.S.A.) In summary, we certify that HCF is not raw asbestos, but a serpentino compound consist ing predominantly of non-asbostos minoraIs and non-asbestiform particles.^ Tito minor chrysotile portion consists of very short fibros of an avorago length which is woll within the category considered as safe, HCP is dovoid of free sllicf, the cause of silicosis. FOS-00-000000 1333 Enel. 2201 `^uioctvfc^l No#nc ,-cl Addreti Hedman Mines Limited P.0. Box S90 SECTION 1 mf^ency 7l?phon No, (70S) 264-0S93 City, Slot., A Zip Cod. TIMMINS, Ontario, Canada Pan 7E7 ^.coi Norn, ond Synonym, Hydrous Haenesium Silicate cpvucoi fomtiy Serpentine (Mixture) Trod. Nom. Hedman Cationic Fibre f* orrnula MgT(Si?0<;)(0H)4 Poinit, Prcicrvoltvi# 6, Solvent! SECTION II - HAZARDOUS INGREDIENTS % rev (Unit,) Alloy! &\4ttalllc Cootlr^i Bote Metal % |'dy4l Alloy, hide u'"' it frW k Metallic Coaling, l-iller Meiot ptu, _n^i>` Cootinq or Core Flux v\Cf? Other, 1 (\l - Hoxardou, Mixture, of Other Liquid,, Solid,, or Gote, Chrysotile Asbestos Fibres (longer than S microns) (Average Determination at 4000X Magnification) ! SECTION III - PHYSICAL DATA Jmg PomiI (f, J por Pietiurc (mm Hg.) pot Oentily (Air.)) Ivbilily n Woler N/a .! tl It . Specific Percent Volatile By Volume ftl) tvoporotion Kate (............. -1) N/a N/a peaionce and Odor Odorless % 1.7 1.87 nk Point (Method Utcd) i'nuiiking Me3ig vciol fitu fighting Procedure, SECTION IV - FIRE ANO EXPLOSION HAZARD DATA tf/a (NON-FLAMMABLE) N/a Flonunoble Limit, N/a L<Jt, _ N/a N/a "DTT 'vivol fire and Expiation N/a (NON-FLAFWABLE) lecti ol Co*'ov*t l rv litlvlgliort SECTION V - HEALTH HAZARO OATA -ii do t imit Value See OSHA Regulations 1910.93 N/a _____ _______________________________________________________________________ N/a_____________________________ _________________;_________________________________________ Prolonged continuous exposure to dust nay cause impairment to the respiratory systetR. ___________________[_________ __________________________________ . p0S_ao-aa1334 2202 Ere lnl*o la l In jest *on to o *' (y UnslobU Stable ncompaiobilily (Msicnois lo avoid) lota'dous Decomposition Pioducts SECTION Yl - REACTIVITY OATA s</a Conaiitons lo ovoid N/a . N/a ntordovi 'olyrncf itolion N/a May occur Will not occur Condition* lo ovoid SECTION VII - SPILL OR LEAK PROCEDURES Steps to be token in cote moleriol it released or s_p_il_le_d___,_,_________,________._._.______________.___, Va.cuum, -clean ..spillage. 'Votie Oispovol Mcthoa ___________________ is necessary wet down spillage. Store waste in closed containers. Repair br SECTION VIII - SPECIAL PROTECTION INFORMATION' ctpiroiory Protection ( Specify ryPe) Q$HA 191Q . 12/7/71. jf applicable. - -- - ^ " - * - ^ -1 r l ' - Vent ilgiion Local Cxhowst Spcciol Mechonicol (General) Other ?<oicctv Glove* Other Protective Equipment Eye Protection Precootio*H to be tokenin handling and storing SECTION IX - SPECIAL PRECAUTIONS Avoid creating excessive dust. Other Prccouliont Store in closed containers. Maintain good housekeeping practices. ^r00'No label is required where asbestos fibres have been modified by a .bonding.------agent, coating, binder or other material so that during any fpreFCeablg.ilS.gj-----------------------------handling, storage, disposal, processing or transportation, no airborne concentvntioi of asbestos fibres in excess of the exposure limits prescribed will be released. (OSHA Regulations 1910.93) cK-aa/ WI.U * Fos-ca-GaGGa1335 2203 DATA SUMMARY TABLE Samples Taken At v Preparation Table (fl?) 3 Air Volume Sampled.ft. Filter ueight gain. mg. Particulate Loading.mg/ft . 3 6rains/ft . Asbestiform type found. Fibre length range, pm. Mean fibre length, pm* Asbestos Concentration, fibres/cc.___ _ 364.1 620 1.15 0.018 Chrysotile 0.1 - 3.0. 0.74 6.28 Number of fibres of length, greater than 4 pm. 0 Blow-Off Area (fll) 248.4 90 0.36 0.006 Chrysotile 0.1 - 1.0 0.36 5.41 0 FOS--00--000000!23b 2204 TABULATION uF RAW SIZING DATA: CHRYSOTILE SAMPLE; FRED HOPTON SAMPLE #2 15/3/74 Preparation Table DATE; t 4/05/74 IZE FIBRE NUMBER TEGORY LENGTH,UM COUNTED 1 0.040 0 2 0.057 0 3 0.080 0 4 0.113 2 5 0. 1 60 I 6 0.226 4 7 0.320 5 8 0.453 5 9 0.640 8 1 0 0.905 3 11 1.280 7 12 1.810 2 13 2.560 1 14 3.620 ' 0 WIDTH CATEGORIES INTO WHICH FIBRES WPRE CLASSIFIED, MICROMETRES 0.040 0 040 0.057 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0. 040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0. 040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.057 0. 340 0.040 - FOS-0C-000000i337 2205 ASDEST F i oilE LENGTH DISTRIBUTE. DATE: 14/05/74 n 3RE LENGTH, MICRCME TRES 40+ SAMPLE : FRED HOPTON SAMPLE /2 15/3/74 Preparation Table Type of asbestiform - chrysotile HUMBER OF FIBRES SIZED = 38 20+ I 0+ 8+ 6+ 4+ 2+ 1+ 0.8+ 0.6 + 0.4 + 0.2+ 0.1 + .08 + .06 + .04 + X 4 X X X X X X X X .02+ .01 + ++ 0.5 I + 2 +*+ + + + + + + + + + + + + 5 10 20 30 40 50 60 70 80. 90 95 98 99 .5 CUMULATIVE PERCENTAGE `MASS ................................ * Fos-00-ac0cooi33a 2206 iijuts lui ' UJ<. LUUiv 1 I'lLIb Ig TABULATION OF RAW SIZING DATA: CHRYSOTILE SAMPLE: FRED HOPTON SAMPLE /I 15/3/74 Blow-Off Area DATE; 14/05/74 ZE FIORE NUMBER egory LENGTH,UM COUNTED 1 0.040 0 2 0.05T 0 3 0.080 0 4 0.113 1 5 0. 1 60 3 6 0.226 6 7 0.320 2 8 0.453 4 9 0.640 2 10 0.905 2 1J 1.280 0 WIDTH CATEGORIES INTO WHICH FIORES WERE CLASSIFIED, MICROMETRES 0.040 0.040 0.057 0.040 0.040 0.040 0.057 0.040 0.040 0.040 0.040 0.057 0.040 0.057 0.040 0.040 0.040 0.040 0.043 0. FQS-C0-C000001239 2207 fibre length, micrometres 40 + SAMPLE : FRED HOPTOR SAMPLE /l 15/3/74 Blow-Off Area TYPE OF AS FJES TI FORM - CHRYSOTILE NUMBER OF FIORES SIZED : 20 20+ I 0+ 846+ 4+ 2+ 1+ 0.84- 0.6+ 0.4 + -T 0.24- 0.1 + . 084- X .06 + .04 + .02+ X X X X X X .014+ 4- 0.5 I + + 4* 4- +++-+ + + + + 4-+-t 2 % 10 20 30 40 50 60 70 80 90 95 98 99 .5 * CUMULATIVE PERCENTAGE ./IASS LESS THAN STATED LENGTH (LOG. PKOnAUU.ITY SCALE) FOS-00-00000013+0 2208 T^WT- T