113 Каталог HOFFMANN GROUP 2020 Промышленные средства индивидуальной защиты Стр.113

Каталог HOFFMANN GROUP 2020 Средства индивидуальной защиты Стр. 113 0113 Lab2u

SGD Hoffmann Group 51 Pictograms: Silicone- free All-round sealing lip Configurable nose clip Adjustable headbands Re-usable Silicone-free An important fundamental condition for breathing by humans is that at least 17 % oxygen by volume is present in the air. Oxygen concentrations less than this lead quickly to loss of consciousness, followed by death. Even when there is sufficient oxygen and normal breathing conditions, the lungs can be damaged by many different substances: Aerosols Gases and vapours Dust is the collective term for finely divided solid fragments (particles) suspended in gases, especially in the air. Gases always fill the totality of the available space completely and uniformly. 111 Mists consist of finely distributed droplets of liquid in the air. Vapours are gaseous materials which however at 20 °C and 1 bar pressure are liquid or solid. Protection against particles =C Disposable respirators For short periods of use, or frequent interchange of personnel. Foldable Handy for carrying around due to flat foldable mask body. Breathing protection Pre-formed Easy to use due to pre-formed mask body. Protection against gases, vapours and particles Re-usable respirators For frequent use and for wearing for long periods. Half-face masks Sturdy mask body which covers the mouth and Full-face masks Respirator with additional face protection. Breathing support systems For wearing for long periods in demanding environments. Blower systems Filtering the ambient air without respiratory resistance (oxygen content > 17 %) Compressed air systems Clean air supply if there is lack of oxygen (oxygen content 17 %) \ Fittings: Without exhalation valve with exhalation valve Duration of wearing: 75 min 120 min Recovery time: 30 min 30 min Uses per shift: 5 3 Shifts per week: 4(2-0-2) 5 120 min 30 min 3 5 105 min 30 min 3 5 nose The correct filter class is determined by the concentration of particles present in the ambient air. The critical value for this is the relevant "maximum allowable dust concentration (MAC)". This is 1.25 mg/m3. If a specific allowable concentration is specified, a multiple of this allowable concentration should be used. If breathing protection is necessary against or gases or vapours, the use of a half-face or full-face mask with the appropriate gas filter may provide a solution. Gas filters are selected according to the relevant substance group, and are applied to the body of the mask. If simultaneous protection against gases, vapours and particles is required, a combination filter must be used. Depending on their absorption capacity, gas filters are divided into different classes. The higher the class, the higher the pollutant concentration for which a filter can be used. Filter class Pollutant limit value Overall leakage value FFP1 up to 4 times the permissible workplace concentration limit max. 22 % FFP2 up to 10 times the permissible workplace concentration limit max. 8 % FFP3 up to 30 times the permissible workplace concentration limit max. 2 % Gas filters Maximum workplace concentration limit Class 1 0.1 % by volume = 1000 ppm Class 2 0.5 % by volume = 5000 ppm Class 3 1.0 % by volume = 10000 ppm 113