Document gDzngq068kNmKYYn7ogn6Gk9e

FILE NAME: Allied Signal Bendix (ASB) DATE: 1979 Mar 1 DOC#: ASB137 DOCUMENT DESCRIPTION: Memo RE 'Friction Materials Work Practices Guide1with Guide Attached General Bulletin Attachment D a ta To March 1, 1979 A ll Distributor and Rabuildar Customer Automotiv* Afterm arket 1094 0OA<|i ^cson, Tennen** 31301 Subjact " Friction Materials Work Practices Guide" In this era w e are eonsistantly striving to make the environm ent and in particular the work place, as free of products that might be harm ful to our health, as is humanly possible. One of the elements identified as a potentially harmful product is asbestos, commonly used in the composition of brake linings. A i manufacturer of brake lininos and eiac oads wa mek> cancoivtble effort Within the lim its of available technoloov. to keep the workplace for ourworker. asJTM flt asbestos emission IS possible- The responsibility does nm end here h n w M f n,.F customers and your customer should iso be fully aware of the necesaitv to inform m , ^ e r . af the necessary precautions when handling or workino w ith brake linino. diM nd . ,, h gi , , ^ The Friction M aterials Standards Institute, which is an association of the brake lining manufacturers, has published a Work Practices Guide. It is aimed at the brake shops and any other areas where me workers are engaged in handling, grinding, etc., brake linings, disc pads and clutch facings. The least amount of grinding you and your customers do. greatly helps reduce the amount of asbestos emissions in the environm ent W e believe m s a fine publication and it carries v h *l a a I m atter of fact- w a will ho incorporating it into our brake clinic arooram. A fter reviewing the enclosed copy, give consideration to distributing the booklets to your customers. Determine your requirements and tot us know your needs. These booklets cost ua approximately 10 cents each, however, we are happy to supply raasonsbit quantities w ithout ehargt. THE 8ENDIX CORPORATION AUTOMOTIVE AFTERMARKET let^ rN o.7 9 1 HWBUI0000164 October 1978 HWBUI0000165 USE DUST COLLECTION EQUIPMENT WHEN MACHINING IN T R O D U C T IO N Tne purpose of this booklet is to provide practical guidelines for brake and clutch service mechanics in the handling and process ing of asbestos c o n tain in g fric tio n m a te ria ls and in the m aintenance and repair of brake and clutch assemblies on which the m atenais are installed. Adherence to the recommended work practices will reduce employee exposure to airborne concentrations of asbestos dust and w ill assist em ployers in com plyin g w ith governm ent regulations. . This area is regulated by federal, state and local authorities We caution that you may not rely on strict adherence to the work practices recommended herein as assuring compliance with these regulations, because (a ) they are subject to amendment; (b) th e re a re on-going a d m in istra tive in te rp re ta tio n s of these regulations; and (c) particular field conditions may vary. You should direct all Questions relating to com pliance with regulations to the appropriate regulatory agencies. ASBESTOS AND FRICTION MATERIALS Most molded friction m aterials contain about 50% ashestnt . some woven materials over 90%. In molded m aterials resin binders prevent the release of asbestos fibers during normal handling. Woven friction materials, normally used only in con struction and industrial applications, must be handled with care to avoid Creating dust as the asbestos fibers are less firm ly bound into the product Potentially hazardous airborne concentrations of asbestos dust can be created bv im proper cleaning and handling of worn b rak. and d u tc h assemblies, uncontrolled machining operations a.m noor housekeeping Breathing excessive quantities of asbestos fiber can cause respiratory disease and cancer. Smoking greatly increases the risk of lung cancer among asbestos workers. Prevention of asbestos dust exposure is the only known method of elim inating asbestosrelated disease among those working with asbestos containing products. Proper work practices offer the best assurance of providing exposure safeguards for workers removing, installing and machinme asbestos containing friction m aterials. 3 DO NOT USE AN AIR HOSE FOR CLEANING H W B U I0 0 0 0168 SUMMARY OF OSHA ASBESTOS STANDARD EFFECTIVE JULY 1 ,1 9 7 6 U nder the current standard, it is the employer's responsibility to assure that exposure of employees does not exceed the following perm issible exposure levels. a. Eight-hour tim e-w eighted average: Two fibers, longer than five m icrom eters, per cubic centim eter. ' b. Ceiling (Peak) concentrations: Ten fibers, longer than five m icrom eters, per cubic centim eter. Engineering controls such as isolation, enclosure, exhaustventilation and dust collection are the preferred methods for m eeting the prescribed exposure lim its. All external surfaces must be m ain tained free of asbestos fiber accum ulation. Respiratory protection is required whenever airborne fiber con centrations exceed either the perm issible tim e weighted average level or the perm issible ceiling concentration. Protective clothing is required whenever airborne fib er concentrations exceed the perm issible ceiling level. Caution signs, change rooms and employee notification are required where asbestos fiber concen trations exceed perm issible exposure lim its. The standard re quires that all workplaces where asbestos fibers may be released shall be m onitored to determ ine exposure levels, and regular m onitoring is required where exposure levels are expected to exceed perm issible lim its. Employers m ust m aintain records of m onitoring required by the standard. They must also provide or m ake available m edical exam inations for employees exposed to airborne concentrations of asbestos fibers. 5 HWBUI0000169 USE VACUUM OR WET METHODS FOR CLEANING 6 HWBUI0000170 HANDLING NEW FRICTION MATERIALS Handling new disc brake assemblies, lined brake shoes, clutch facings and brake blocks purchased in individual boxed sets is unlikely to create significant airborne concentrations of asbestos dust. If the parts are purchased in bulk quantities, abrasion during shipm ent may result in the accum ulation of dust in shipping containers. Oust should be removed by vacuuming or cleanins with a dam p d o th . * Whenever possible, purchase friction materials preground and ready for installation. This may keep dust levels below OSHA maximums and elim inate the need for respiratory protection, restricted areas, regular monitoring, special clothing, change rooms and employee notification. REMOVING WORN FRICTION MATERIALS Asbestos fibers in disc brake linings, drum brake linings, blocks and dry clutch facings are locked into the product with resin binders which prevent the release of asbestos fiber during normal installation. Heat and abrasion during normal use mav generate dust containing asbestos. Some dust will accum ulate in brake and clutch assemblies. When removing worn friction materials, remove the accumulated dust in th e assem b lies w ith an in d u stria l vacuum clean er equipped with a high efficiency filter system. If such equipment is not available, dust can be removed with a dam p doth. Do nnt us compressed air or dry brushing for cleaning. Use a NlQSH approved respirator when removing worn friction m aterials, or cleaning brake or dutch assemblies. M A C H IN IN G FRICTION MATERIALS There is an increasing trend for manufacturers and rebuilders to provide brake lining and clutch facings pre-drilled and pre-ground in final assembly form. In the case of truck brake blocks, various oversize thicknesses are available. However, there are some instances where field machining is necessary. This is particularly true for construction and industrial equipm ent applications which may require m achining of blocks, slab stock or roll lining. Oust generation can be m inim ized or elim inated during arcing of brake blocks by lathe turning at low speed rather than grinding. Whenever possible friction materials should be cut to length with a shear rather than a saw or abrasive cut-off wheel. 7 DO NOT SWEEP IN WORK AREA - USE VACUUM METHOD DUST COLLECTION METHODS When asbestos-containing friction materials are machined i > grooved. M o r beveled, the dust created contain asbestos fibers which may become airborne unies adquat ni i controls y e employed. The preferred method for minimizing i t rborne dust from machining operation is local exhaust venm. Hon.A c a l exhaust ventilation system consists of dust collection hoods or enclosures connected by duct work or piping to a dust collection filter end a suction source. The two operations that offer the greatest potential far g e n e r a l Of excessive amounts of airborne asbestos fiber are arc grinding and beveling of lined brake shoes and linings or brake block Grinding machines used for these operations m ust be p ro vid e With exhaust ventilation to maintain worker exposures within perm issible levels. If a central exhaust system is not available. NIOSH (National Institute for Occupational Safety and Health) has stated that, at a m im inum . the dust bag of the arcing machine shall be removed and replaced with the hose from a high efficiency industrial vacuum. For large volume machining operations that operate on a con tinuous basis, the preferred-dust collection device is a fabric filter or baghouse. with a heavy-duty exhaust fan as the suction source. The dust collector must meet the air-cleaning requirements of the Federal Environmental Protection Agency Emission Standard for Asbestos. Approval must be obtained from EPA for installation and operation of each system. OTHER METHODS OF M IN IM IZ IN G DUST EXPOSURE Whenever possible machining and repair operations should ba isolated from other work areas in a restricted area to prevent unnecessary exposure of other workers. Entrances to restricted areas shall be posted with asbestos exposure warning signs as follows: Asbestos Dust Hazard Avoid Breathing Dust Wear Assigned Protective Equipment Do Not Remain In Area Unless Your Work Requires It Breathing Asbestos Dust May Be Hazardous To Your Health HWBUI0000173 WEAR AN APPROVED RESPIRATOR IF UNABLE TO AVOID DUST HWBUI0000174 t Good housekeeping is essential in a workplace where asbestos containing m aterials are handled. Industrial vacuum cleaners equipped with m ultiple stage high efficiency filters should be used for removing accumulations of asbestos dust and waste. Never use compressed air or dry sweeping for cleaning. Watar or Other dust suppressants should be aoolid if brooms are UMd. Good personal hygiene practices are im portant in m inim izing asbestos dust exposure. Do not smoke. Wash before eating Shower after wprk Change tP work clothes upon arrival at work and Change from work clothes at conclusion of work. Work clothing should not b taken homg. Laundering of asbestos contam inatedClothing shall be done so as to prevent the release of airham* asbestos fibers in excess of the exposure lim its DISPOSALOF FRICTION MATERIALDUST AND WASTE Dispose of vacuum cleaner waste and asbestos containing cleaning m aterials in plastic bags or other sealed containers, with the following warning label printed on the container: Caution Contains Asbestos Fibers Avoid Creating Dust Breathing Asbestos Dust May Cause Serious Bodily Harm Use a N IO SH approved resp ira to r when servicing vacuum cleaners, dust collectors, or handling any asbestos-containing waste materials. Asbestos-containing waste m aterials must be collected, process ed. packaged, transported and deposited in such fashion that no visible emissions are generated to the atmosphere. All wastes m ust be disposed of at sites o perated in accordance with applicable laws and regulations. 11 HWBUI0000175 SOURCES OF ADDITIONAL INFORMATION Standard for Capoeure to Aabaatos OuaT (Coda of Fadaral Regulations. Titla 29. 1910.100l)-OSHA National Citow orw SUndards for Hazardous A ir Pollutants-A sbestos and Mu i m j * (Coda of Fadaral Regulations Titla 40. Chapter 1. Subchapter C. Part 61. Subearts A. 8>--EPA -Fundam entals Governing the Oasign and Operation of Local ANSI Z9 2 1971 ($7.00) and ` Praetaeas lo r Rasprratory Protection. ANSI Z86.21969 ($5.50)--ANSI In d u s tria l Ventilation M anuar ($6.00)--ACG1H For other information, a user may contact the m anufacturer supplying h is fnction m aterials, the Asbestos inform ation Association or the Fnction Matanais Stand* ares institute. AC6IH , Am erican Conference of Governmental industrial Hygienists Com m ittee on industrial ventilation P 0 . Bos 16153 Lansing. M l 48901 ANSI American National Standards institute 1430 Broadway N e fork. NY 10018 AIA Asbestos Information Association 1 7 4 5 Jefferson Davis Highway Arlington. VA 2 2 2 0 2 EPA Environmental Protection Agency Public inform ation Center 4 0 1 M Street SW Washington. OC 20460 FMSI Fnction Matenats Standards Institute East 210 Route 4 Paramus. NJ 07652 OSHA Occupational Safety and Health Adm inistration Office of Information Washington. OC 20210 October 1978