HCL

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## NATIONAL RESEARCH COUNCIL RECOMMENDATIONS CONCERNING CHEMICAL HYGIENE IN LABORATORIES Determine the physical and health hazards associated with chemicals before working with them. This determination may involve consulting literature references, laboratory chemical safety summaries (LCSSs), SDSs, or other reference materials. Consider how the chemicals will be processed and determine whether the changing states or forms will change the nature of the hazard. Review your plan, operating limits, chemical evaluations and detailed risk assessment with other chemists, especially those with experience with similar materials and protocols. Before working with chemicals, know your facility's policies and procedures for how to handle an accidental spill or fire. Emergency telephone numbers should be posted in a prominent area. Know the location of all safety equipment and the nearest fire alarm and telephone. ## 3. Adhere to the Hierarchy of Controls The hierarchy of controls prioritizes intervention strategies based on the premise that the best way to control a hazard is to systematically remove it from the workplace, rather than relying on employees to reduce their exposure. The types of measures that may be used to protect employees (listed from most effective to least effective) are: engineering controls, administrative controls, work practices, and PPE. Engineering controls, such as chemical hoods, physically separate the employee from the hazard. Administrative controls, such as employee scheduling, are established by management to help minimize the employees' exposure time to hazardous chemicals. Work practice controls are tasks that are performed in a designated way to minimize or eliminate hazards. Personal protective equipment and apparel are additional protection provided under special circumstances and when exposure is unavoidable. Face and eye protection is necessary to prevent ingestion and skin absorption of hazardous chemicals. At a minimum, safety glas…

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## NATIONAL RESEARCH COUNCIL RECOMMENDATIONS CONCERNING CHEMICAL HYGIENE IN LABORATORIES <!-- image --> - (e) The contents of all other chemical containers and transfer vessels, including, but not limited to, beakers, flasks, reaction vessels, and process equipment, should be properly identified. - (f) Chemical shipments should be dated upon receipt and stock rotated. - (g) Peroxide formers should be dated upon receipt, again dated upon opening, and stored away from heat and light with tightfitting, nonmetal lids. - (h) Open shelves used for chemical storage should be secured to the wall and contain 3/4-inch lips. Secondary containment devices should be used as necessary. - (i) Consult the SDS and keep incompatibles separate during transport, storage, use, and disposal. - (j) Oxidizers, reducing agents, and fuels should be stored separately to prevent contact in the event of an accident. - (k) Chemicals should not be stored in the chemical hood, on the floor, in areas of egress, on the benchtop, or in areas near heat or in direct sunlight. - (l) Laboratory-grade, flammable-rated refrigerators and freezers should be used to store sealed chemical containers of flammable liquids that require cool storage. Do not store food or beverages in the laboratory refrigerator. - (m) Highly hazardous chemicals should be stored in a well-ventilated and secure area designated for that purpose. - (n) Flammable chemicals should be stored in a spark-free environment and in approved flammable-liquid containers and storage cabinets. Grounding and bonding should be used to prevent static charge buildups when dispensing solvents. - (o) Chemical storage and handling rooms should be controlled-access areas. They should have proper ventilation, appropriate signage, diked floors, and fire suppression systems. ## Chemical Handling: - (a) As described above, a risk assessment should be conducted prior to beginning work with any hazardous chemical for the first time. - (b) All SDS and label …

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## SUBSTANCE SAFETY DATA SHEET &amp; TECHNICAL GUIDELINES FOR METHYLENE CHLORIDE ## 2. Eye Irritation Level: Kirk-Othmer reports that 'MC vapor is seriously damaging to the eyes.' Sax agrees with Kirk-Othmer's statement. The ACGIH Documentation of TLVs states that irritation of the eyes has been observed in workers exposed to concentrations up to 5000 ppm. ## 3. Evaluation of Warning Properties: Since a wide range of MC odor thresholds are reported (25-320 ppm), and human adaptation to the odor occurs, MC is considered to be a material with poor warning properties. ## III. Emergency First Aid Procedures In the event of emergency, institute first aid procedures and send for first aid or medical assistance. ## A. Eye and Skin Exposures: If there is a potential for liquid MC to come in contact with eye or skin, face shields and skin protective equipment must be provided and used. If liquid MC comes in contact with the eye, get medical attention. Contact lenses should not be worn when working with this chemical. ## B. Breathing: If a person breathes in large amounts of MC, move the exposed person to fresh air at once. If breathing has stopped, perform cardiopulmonary resuscitation. Keep the affected person warm and at rest. Get medical attention as soon as possible. ## C. Rescue: Move the affected person from the hazardous exposure immediately. If the exposed person has been overcome, notify someone else and put into effect the established emergency rescue procedures. Understand the facility's emergency rescue procedures and know the locations of rescue equipment before the need arises. Do not become a casualty yourself.

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<!-- image --> ## SUBSTANCE SAFETY DATA SHEET &amp; TECHNICAL GUIDELINES FOR METHYLENE CHLORIDE ## IV. Respirators, Protective Clothing, and Eye Protection ## A. Respirators: Good industrial hygiene practices recommend that engineering controls be used to reduce environmental concentrations to the permissible exposure level. However, there are some exceptions where respirators may be used to control exposure. Respirators may be used when engineering and work practice controls are not feasible, when such controls are in the process of being installed, or when these controls fail and need to be supplemented. Respirators may also be used for operations which require entry into tanks or closed vessels, and in emergency situations. If the use of respirators is necessary, the only respirators permitted are those that have been approved by the Mine Safety and Health Administration (MSHA) or the National Institute for Occupational Safety and Health (NIOSH). Supplied-air respirators are required because air-purifying respirators do not provide adequate respiratory protection against MC. In addition to respirator selection, a complete written respiratory protection program should be instituted which includes regular training, maintenance, inspection, cleaning, and evaluation. If you can smell MC while wearing a respirator, proceed immediately to fresh air. If you experience difficulty in breathing while wearing a respirator, tell your employer. ## B. Protective Clothing: Employees must be provided with and required to use impervious clothing, gloves, face shields (eight-inch minimum), and other appropriate protective clothing necessary to prevent repeated or prolonged skin contact with liquid MC or contact with vessels containing liquid MC. Any clothing which becomes wet with liquid MC should be removed immediately and not reworn until the employer has ensured that the protective clothing is fit for reuse. Contaminated protective clothing should be placed in a …

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opened, or another equally effective means is used to prevent employees from accessing the spinning rotor. tout aussi efficace permet de prévenir l'accès des sala -riés aux rotors qui tournent. 2022-79 ## General 2022-79 ## Safety procedures - hazardous operations 2022-79 342.7 With respect to hazardous operations, an em -ployer shall ensure that - (a) written safe work procedures for hazardous op -erations, including spill response, are established, - (b) employees are adequately instructed and trained in the safe work procedures for hazardous operations, and - (c) employees follow the safe work procedures for hazardous operations. 2022-79 ## Fire protection 2022-79 342.71 An employer shall ensure that suitable fire ex -tinguishers are accessible at all times in a laboratory where flammable substances are used or stored. 2022-79 ## Movement of containers 2022-79 342.72 An employer shall ensure that a container of hazardous substances that is moved within a laboratory is moved in a manner that does not damage the con -tainer. 2022-79; 2024-38 ## Personal protection 2022-79 342.8 With respect to the protection of employees, an employer shall ensure that 2022-79 ## Généralités 2022-79 ## Procédures de sécurité - opérations dangereuses 2022-79 342.7 En ce qui à trait aux opérations dangereuses, l'employeur s'assure de ce qui suit : - a) il établit des procédures écrites de travail sécuri -taire pour les opérations dangereuses, y compris les déversements; - b) les salariés reçoivent une formation adéquate sur ces procédures; - c) les salariés suivent ces procédures. 2022-79 ## Protection contre l'incendie 2022-79 342.71 L'employeur s'assure que des extincteurs d'in -cendie convenables sont disponibles en tout temps dans tout laboratoire où des substances inflammables sont utilisées ou entreposées. 2022-79 ## Déplacement de récipients 2022-79 342.72 L'employeur s'assure que le dépla…