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Methylene Chloride (MC) PowerPoint PPT Presentation


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Methylene Chloride (MC). Familiarization with MC. MC is used as a solvent, especially where quick evaporation is needed Methylene chloride dissolves oils, fats, waxes, resins, rubber. 1a. Familiarization with MC. Methylene chloride is used: in paint strippers as an ingredient in adhesives

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Methylene Chloride (MC)

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Methylene chloride mc l.jpg

Methylene Chloride(MC)


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Familiarization with MC

  • MC is used as a solvent, especially where quick evaporation is needed

  • Methylene chloride dissolves oils, fats, waxes, resins, rubber

1a


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Familiarization with MC

  • Methylene chloride is used:

    • in paint strippers

    • as an ingredient in adhesives

    • as a degreasing agent

    • in propellant mixtures for aerosols

    • as an extracting agent in the pharmaceutical industry

    • as a blowing agent in polyurethane foam manufacture

1b


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Training requirements

  • How to detect the chemical’s presence or release

  • The physical and health hazards of the chemical

2a


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Training requirements

  • Safe work practices

  • Emergency procedures

  • Personal protective equipment

2b


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Training requirements

  • The hazard communication program

  • Chemical labeling

  • How to use MSDSs

2c


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Training requirements

  • Training is required under OSHA’s Hazard Communication standard

  • Training on MC is required before, or at the time of initial assignment to a job involving potential exposure to MC

2d


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Training requirements

  • Hazard communication training must include the hazards of:

    • cancer

    • cardiac effects

    • central nervous system effects

    • liver effects

    • skin and eye irritation

2e


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Training requirements

  • In addition to HazCom training, you need to know:

    • the requirements of the MC standard

    • the information that is available for MC

    • how to access or obtain copies of the standard and its appendices

2f


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Training requirements

  • When exposures may be above the action level (12.5 ppm as an 8-hour TWA), you need to know:

    • quantity

    • location

    • manner of use

    • release

    • storage locations

2g


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Training requirements

  • Specific operations in our workplace that could result in exposure to MC

2h


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Training requirements

  • Employees who are exposed above the action level or the STEL (125 ppm for any 15-minute sampling period) may need to be re-trained

  • Changes in the workplace can also trigger re-training

2i


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Physical hazards

  • Methylene chloride:

    • is a clear colorless liquid with a chloroform-like odor

    • is only slightly soluble in water and mixes completely with most solvents

    • evaporates very quickly

    • vapors are heavier than air

3a


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Physical hazards

  • MC forms flammable vapor/air mixtures at temperatures at or above 212 degrees F

  • When MC is involved in a fire, it decomposes into highly toxic and irritating chemicals

3b


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Physical hazards

  • Fires and explosions may result if MC comes into contact with strong oxidizers, caustics, and chemically active metals

  • Heat and moisture contribute to the instability of MC

3c


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Health hazards

  • The primary route of entry for MC is inhalation of its vapors

  • MC can also be ingested or absorbed by the skin

  • Direct contact with the liquid is irritating to the eyes/skin

4a


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Health hazards

  • Health hazards can be either acute (short-term) or chronic (long-term)

  • The effects of long-term overexposure to MC may include cancer

4b


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Health hazards

  • There is evidence that MC can have adverse effects on the heart, central nervous system, and liver

4c


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Material Safety Data Sheets

  • The Hazard Communication standard requires MSDSs for products that contain hazardous materials

5a


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Material Safety Data Sheets

  • When the product contains MC, make sure you are familiar with its health hazards in regards to:

    • cancer

    • cardiac effects

    • central nervous system effects

    • liver effects

    • skin and eye irritation

5b


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Material Safety Data Sheets

  • MSDSs provide other useful information about how to handle the product and protect yourself from its hazards

5c


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Labeling

  • All containers of MC must have legible labels that include the hazards

  • Labels must comply with the Hazard Communication standard

6a


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Labeling

  • The label’s legend can be similar to the following:

6b


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Exposure limits

  • Exposures to airborne MC must be at safe levels

  • An employee’s exposure is determined without the use of a respirator

  • Exposures are given in parts per million (ppm)

7a


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Exposure limits

  • OSHA has set safe exposure limits as follows:

    • 25 ppm as an 8-hour Time Weighted Average Permissible Exposure Limit (TWA PEL)

    • 125 ppm as a 15-minute Short Term Exposure Limit (STEL)

7b


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Exposure limits

  • The action level is 12.5 ppm as an 8-hour TWA

7c


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Monitoring

  • When MC is present in the workplace, the employer must determine each employee’s exposure

  • One or more samples can be used to represent the exposures of several employees

8a


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Monitoring

  • The employer has to conduct initial monitoring unless:

    • there is objective evidence that airborne concentrations of MC will not reach the action level or STEL

8b


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Monitoring

  • The employer has to conduct initial monitoring unless:

    • employees are exposed to MC less than 30 days per year

    • adequate monitoring results were obtained in the year before the MC rule was effective (within 12 months prior to April 10, 1997)

8c


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Monitoring

  • Periodic air monitoring must be conducted, depending on the results of the initial monitoring

  • Monitoring may need to be done as frequently as every three months

8d


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Monitoring

  • Employees or their representatives have the right to observe any exposure monitoring

  • Anyone who is an observer must wear all necessary PPE and protective equipment

8e


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Monitoring

  • Observers must follow all safety rules and procedures for the area

  • Employees must be informed of the monitoring results within 15 working days after the employer receives them

8f


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Monitoring

  • The written notification of the results must include corrective actions being taken to reduce any exposures to below the 8-hour TWA PEL or STEL

8g


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Medical screening/surveillance

  • Guidelines for the medical screening and surveillance program are in Appendix B of the standard

  • Initial screening is provided before initial assignment

9a


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Medical screening/surveillance

  • Screening is conducted at no cost to the employee, without loss of pay, and at a reasonable time and place

9b


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Medical screening/surveillance

  • Medical screening and surveillance will be provided for a worker whose exposure to MC is:

    • at or above the action level on 30 or more days per year

    • above the 8-hour TWA PEL or STEL for 10 days or more per year

9c


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Medical screening/surveillance

  • Medical screening & surveillance will be provided for a worker whose exposure to MC is:

    • above the 8-hour TWA PEL or STEL for any period of time if the employee has been identified as being at risk from cardiac disease or any other serious MC related health condition

9d


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Medical screening/surveillance

  • Medical screening & surveillance will be provided for a worker whose exposure to MC is due to an emergency involving MC

9e


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Medical screening/surveillance

  • Continuing medical screening and surveillance is provided as follows:

    • Employees 45 or older will receive annual periodic medical surveillance

    • Employees under 45 will receive periodic medical surveillance every 36 months

9f


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Medical screening/surveillance

  • A medical examination and appropriate tests are provided upon termination of employment if six months or more have elapsed since the last physical examination

9g


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Medical screening/surveillance

  • A medical screening includes a baseline health questionnaire that emphasizes:

    • Neurological symptoms

    • Skin conditions

    • History of hematologic or liver diseases

    • Signs or symptoms of congestive heart disease

9h


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Medical screening/surveillance

  • A medical screening includes a baseline health questionnaire that emphasizes:

    • Risk factors for heart disease

    • MC exposure

    • Work practices used

    • PPE

9i


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Medical screening/surveillance

  • The physician issues a written medical opinion no more than 30 days after the examination

  • The written opinion is provided to both the employer and the employee

9j


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Medical screening/surveillance

The information in the written opinion is limited to:

  • Occupationally pertinent results

9k


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Medical screening/surveillance

  • A medical opinion concerning whether exposure to MC may contribute to or aggravate the employee’s existing cardiac, hepatic, neurological, or dermal disease

9l


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Medical screening/surveillance

  • A medical opinion as to whether the employee has any other medical condition(s) that would place the employee’s health at increased risk from exposure to MC

  • Recommended limitations on the employee’s exposure to MC

9m


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Medical screening/surveillance

  • A statement that the employee has been informed of the health risks associated with MC exposure

  • A statement that the employee has been informed of the results of the medical evaluation

9n


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Temporary medical removal protection benefits

  • In some situations, physicians can recommend that an employee be removed from exposure to MC

10a


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Temporary medical removal protection benefits

  • When exposure to MC is determined to aggravate an employee’s existing condition, medical removal protection benefits are in order

10b


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Temporary medical removal protection benefits

  • The employer can either:

    • transfer the employee to comparable work where MC exposure is below the action level; or

    • remove the employee from MC exposure

10c


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Temporary medical removal protection benefits

  • Temporary medical removal protection benefits include maintaining the earnings, seniority, and other employment rights and benefits

10d


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Temporary medical removal protection benefits

  • If the employee is not exposed above the 8-hour TWA PEL, specific medical evidence must be cited before the employer is required to provide temporary medical removal protection benefits

10e


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Temporary medical removal protection benefits

  • The employer can stop providing medical removal protection benefits at the earliest of the following:

10f


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Temporary medical removal protection benefits

  • Six months

  • Upon receipt of a medical determination that the employee’s exposure will no longer aggravate the medical condition

  • Upon receipt of a medical determination concluding that the employee can never return to MC exposure

10g


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Engineering controls

  • Examples of engineering controls include:

    • dilution ventilation

    • local exhaust ventilation

    • enclosure of the operation

11a


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Engineering controls

  • Engineering controls and work practices must reduce employee exposure to or below the 8-hour TWA PEL and STEL

11b


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Engineering controls

  • When this is not feasible, engineering controls and work practices should reduce exposures to the lowest achievable levels

11c


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Work practice controls

  • Work practices are used with engineering controls to reduce exposures to or below the 8-hour TWA PEL and STEL

12a


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Work practice controls

  • Never eat, drink, or smoke where MC is used, stored, or handled. Also, do not keep food, beverages, or smoking materials in these areas

12b


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Work practice controls

  • Keep containers tightly closed

  • Protect containers from damage

  • Store containers in a cool, dry, and well-ventilated area

12c


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Work practice controls

  • Store containers away from direct sunlight, heat sources, and acute fire hazards

  • Avoid contact with strong oxidizers, caustics, and chemically active metals

12d


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Work practice controls

  • Dispose of waste materials promptly and properly

  • A schedule of job rotation cannot be used as a work practice to limit or reduce exposure

12e


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Respiratory protection

  • Respirators must be used:

    • while an employee’s exposure exceeds the 8-hour TWA PEL or STEL

    • while feasible engineering and work-practice controls are being installed or implemented

13a


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Respiratory protection

  • Respirators must be used:

    • when feasible engineering and work practice controls are not sufficient to reduce exposures to or below the 8-hour TWA PEL or STEL

    • during work operations where engineering and work practice controls are infeasible

    • during emergencies

13b


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Respiratory protection

  • If the right type of respirator is not being used, employees are not being adequately protected

  • In most cases, the standard requires that atmosphere-supplying respirators be used

13c


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Respiratory protection

  • The only time that the use of a negative-pressure air-purifying respirator is allowed is during an emergency escape

  • The odor of MC is not a reliable warning of respirator malfunction for respirator wearers

13d


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Respiratory protection

  • Respirator use must follow requirements in OSHA’s standard on Respiratory Protection

13e


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Personal protective equipment

  • When protective equipment is required, it must be worn

  • PPE must be provided at no cost to the employee

14a


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Personal protective equipment

  • Appropriate PPE includes, but is not limited to:

    • impervious chemical resistant clothing

    • gloves that are resistant to MC

    • splash-proof safety goggles

    • face shields (8-inch minimum)

14b


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Personal protective equipment

  • Any protective clothing that becomes wet with liquid MC should be removed immediately and not reworn until the employer has ensured that it is fit for reuse

14c


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First Aid

  • In the event of an emergency, institute first aid procedures and get appropriate medical assistance

  • For eye contact, flush with large amounts of clean water, and get medical attention immediately

15a


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First Aid

  • For skin contact, remove all contaminated clothing and flush the affected area with large amounts of clean water

  • For inhalation of large amounts of MC vapor, move the person to fresh air immediately

15b


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First Aid

  • Get medical attention as soon as possible

  • Keep the affected person warm and at rest

15c


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First Aid

  • If breathing has stopped, perform rescue breathing/cardiopulmonary resuscitation

15d


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Leaks and spills

  • In areas where spills may occur, make provisions to contain any spills, and to safely dispose of any MC-contaminated waste materials

  • Incidental leaks must be repaired

16a


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Leaks and spills

  • Incidental spills must be cleaned up by employees who are trained in cleanup, and who are using appropriate PPE

16b


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Leaks and spills

  • If MC has spilled or leaked:

    • remove all ignition sources

    • ventilate the area of the spill or leak

    • either collect the material for reclamation or absorb it in vermiculite, dry sand, earth, or a similar material

16c


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Leaks and spills

  • Dispose of contaminated material properly

  • Response to emergency releases of MC is covered by HAZWOPER

16d


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Regulated areas

  • A regulated area is one where airborne concentrations of MC exceed or can reasonably be expected to exceed either the:

    • 8-hour TWA PEL (25 ppm); or

    • STEL (125 ppm)

17a


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Regulated areas

  • The regulated area is marked to establish its boundaries

  • Only authorized persons may have access to regulated areas

17b


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Regulated areas

  • While in a regulated area, workers are not to do any non-work activities that could increase their dermal or oral MC exposure

  • Each person who enters a regulated area must be supplied with a respirator

17c


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Regulated areas

  • The respirator must be used whenever the MC exposures are likely to exceed the 8-hour TWA PEL or STEL

17d


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Marking regulated areas

  • Regulated areas are marked in any manner that adequately establishes and alerts employees to the boundaries

  • Movable signs, temporary barriers, or a system of warning lights can be used

18a


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Marking regulated areas

  • A sample sign legend could look like:

18b


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Standard availability

  • Any employees with jobs that involve the potential for exposure to MC need to know how they can access or obtain a copy of the standard and its appendices

19a


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