Chemwatch : 34-9443 Version No : 4.1.1.1
Page 5 of 12 Fido ' s Fre-Itch Rinse Concentrate For Dogs , Cats , Puppies , Kittens And Cage Birds
Issue Date : 02 / 13 / 2014 Print Date : 06 / 27 / 2016
Process controls which involve changing the way a job activity or process is done to reduce the risk . Enclosure and / or isolation of emission source which keeps a selected hazard " physically " away from the worker and ventilation that strategically " adds " and " removes " air in the work environment . Ventilation can remove or dilute an air contaminant if designed properly . The design of a ventilation system must match the particular process and chemical or contaminant in use . Employers may need to use multiple types of controls to prevent employee overexposure .
General exhaust is adequate under normal operating conditions . Local exhaust ventilation may be required in specific circumstances . If risk of overexposure exists , wear approved respirator . Correct fit is essential to obtain adequate protection . Provide adequate ventilation in warehouse or closed storage areas . Air contaminants generated in the workplace possess varying " escape " velocities which , in turn , determine the " capture velocities " of fresh circulating air required to effectively remove the contaminant .
Type of Contaminant : Air Speed :
solvent , vapours , degreasing etc ., evaporating from tank ( in still air ).
aerosols , fumes from pouring operations , intermittent container filling , low speed conveyer transfers , welding , spray drift , plating acid fumes , pickling ( released at low velocity into zone of active generation )
direct spray , spray painting in shallow booths , drum filling , conveyer loading , crusher dusts , gas discharge ( active generation into zone of rapid air motion )
grinding , abrasive blasting , tumbling , high speed wheel generated dusts ( released at high initial velocity into zone of very high rapid air motion ).
0.25-0.5 m / s ( 50-100 f / min )
0.5-1 m / s ( 100-200 f / min .)
1-2.5 m / s ( 200-500 f / min .)
2.5-10 m / s ( 500-2000 f / min .)
Within each range the appropriate value depends on :
Lower end of the range
Upper end of the range 1 : Room air currents minimal or favourable to capture 1 : Disturbing room air currents 2 : Contaminants of low toxicity or of nuisance value only . 2 : Contaminants of high toxicity 3 : Intermittent , low production . 3 : High production , heavy use 4 : Large hood or large air mass in motion 4 : Small hood-local control only
Simple theory shows that air velocity falls rapidly with distance away from the opening of a simple extraction pipe . Velocity generally decreases with the square of distance from the extraction point ( in simple cases ). Therefore the air speed at the extraction point should be adjusted , accordingly , after reference to distance from the contaminating source . The air velocity at the extraction fan , for example , should be a minimum of 1-2 m / s ( 200-400 f / min ) for extraction of solvents generated in a tank 2 meters distant from the extraction point . Other mechanical considerations , producing performance deficits within the extraction apparatus , make it essential that theoretical air velocities are multiplied by factors of 10 or more when extraction systems are installed or used .
Personal protection
Eye and face protection
Skin protection
Hands / feet protection
Safety glasses with side shields . Chemical goggles . Contact lenses may pose a special hazard ; soft contact lenses may absorb and concentrate irritants . A written policy document , describing the wearing of lenses or restrictions on use , should be created for each workplace or task . This should include a review of lens absorption and adsorption for the class of chemicals in use and an account of injury experience . Medical and first-aid personnel should be trained in their removal and suitable equipment should be readily available . In the event of chemical exposure , begin eye irrigation immediately and remove contact lens as soon as practicable . Lens should be removed at the first signs of eye redness or irritation - lens should be removed in a clean environment only after workers have washed hands thoroughly . [ CDC NIOSH Current Intelligence Bulletin 59 ], [ AS / NZS 1336 or national equivalent ]
See Hand protection below
The selection of suitable gloves does not only depend on the material , but also on further marks of quality which vary from manufacturer to manufacturer . Where the chemical is a preparation of several substances , the resistance of the glove material can not be calculated in advance and has therefore to be checked prior to the application . The exact break through time for substances has to be obtained from the manufacturer of the protective gloves and . has to be observed when making a final choice . Suitability and durability of glove type is dependent on usage . Important factors in the selection of gloves include : frequency and duration of contact , chemical resistance of glove material , glove thickness and dexterity
Select gloves tested to a relevant standard ( e . g . Europe EN 374 , US F739 , AS / NZS 2161.1 or national equivalent ). When prolonged or frequently repeated contact may occur , a glove with a protection class of 5 or higher ( breakthrough time greater than 240 minutes according to EN 374 , AS / NZS 2161.10.1 or national equivalent ) is recommended . When only brief contact is expected , a glove with a protection class of 3 or higher ( breakthrough time greater than 60