Chemwatch : 4883-44 Version No : 4.1.1.1
Page 6 of 10 Nature ' s Answer Pernaease Powder
Issue Date : 12 / 22 / 2014 Print Date : 06 / 27 / 2016
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 4-10 m / s ( 800-2000 f / min ) for extraction of crusher dusts generated 2 metres 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
Body protection
Other protection
Thermal hazards
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 minutes according to EN 374 , AS / NZS 2161.10.1 or national equivalent ) is recommended . Some glove polymer types are less affected by movement and this should be taken into account when considering gloves for long-term use . Contaminated gloves should be replaced . Gloves must only be worn on clean hands . After using gloves , hands should be washed and dried thoroughly . Application of a non-perfumed moisturiser is recommended . Experience indicates that the following polymers are suitable as glove materials for protection against undissolved , dry solids , where abrasive particles are not present . polychloroprene . nitrile rubber . butyl rubber . fluorocaoutchouc . polyvinyl chloride . Gloves should be examined for wear and / or degradation constantly .
See Other protection below
Overalls . P . V . C . apron . Barrier cream . Skin cleansing cream . Eye wash unit .
Not Available
Respiratory protection
Particulate . ( AS / NZS 1716 & 1715 , EN 143:000 & 149:001 , ANSI Z88 or national equivalent )
Required Minimum Protection Factor Half-Face Respirator Full-Face Respirator Powered Air Respirator