Chemical local exhaust

Drug room Oust from small drugs (complex organic compounds) Substitution Master batches FYeweighed, sealed bags Dust-suppressed chemicals Local exhaust ventilation Care in handling... 

It is good practice to keep concentrations of airborne nickel in any chemical form as low as possible and certainly below the relevant standard. Local exhaust ventilation is the preferred method, particularly for powders, but personal respirator protection may be employed where necessary. In the United States, the Occupational Safety and Health Administration (OSHA) personal exposure limit (PEL) for all forms of nickel except nickel carbonyl is 1 mg/m. The ACGIH TLVs are respectively 1 mg/m for Ni metal, insoluble compounds, and fume and dust from nickel sulfide roasting, and 0.1 mg/m for soluble nickel compounds. The ACGIH is considering whether to lower the TLVs for all forms of nickel to 0.05 mg/m, based on nonmalignant respiratory effects in experimental animals. 

Various mixtures of wet chemical acid solutions are used in plastic baths in locally exhausted etch stations. The primary acids in use are sulfuric hydrofluoric, hydrochloric and phosphoric. As in silicon processing, hydrogen peroxide used with sulfuric acid and ammonium hydroxide (NH OH) provides a caustic etch. 

It is good practice to keep concentrations of airborne nickel in any chemical form as low as possible and certainly below the relevant standard. Local exhaust ventilation is the preferred method, particularly for powders, but personal respirator protection may be employed. 

Vent into local exhaust devices any apparatus that may discharge toxic vapors, fumes, mists, dusts, or gases. Never release toxic chemicals into cold rooms or warm rooms that have recirculating atmospheres. 

PERSONAL PROTECTION Wear impervious protective clothing, including boots, chemical-resistant gloves, lab coat, apron or coveralls use chemical safety goggles enclose operations and use local exhaust ventilation at site of chemical release wear self-contained breathing apparatus maintain eyewash baths and safety showers in work area remove all sources of ignition. 

PERSONAL PROTECTION wear full protective clothing and chemical resistant gloves wear splash-proof safety goggles, in combination with breathing protection use a closed system of local exhaust ventilation at site of chemical release use explosion-proof electrical equipment and lighting for extra personal protection, a filter respirator for organic vapors of low boiling compounds is recommended. 

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