Guidance on Control Measures: Engineering Controls: NIOSH has determined that effective controls for employers in microwave popcorn packaging plants using FFCD include isolation of mixing processes (i.e. enclosures) and use of local and general exhaust ventilation to reduce inhalation exposure to FFCD (NIOSH, 2003). Such control measures may be able to be applied to other worksites using diacetyl and FFCD in processes similar to those in microwave popcorn packaging plants. Respiratory Protection: Because there is no established permissible exposure limit (PEL), NIOSH Recommended Exposure Limit (REL), or other recommended exposure limit for diacetyl or FFCD, determining appropriate respiratory protection will depend on the specific conditions under which these chemicals are used. Employers must consider the operations, environmental conditions, and other factors when selecting appropriate respirators (29 CFR 1910.134(d)). When an employer has completed a hazard evaluation and has determined that respiratory protection is required, a suitable respirator must be selected. Based on the NIOSH investigations of microwave popcorn plants, a NIOSH-certified air-purifying respirator equipped with organic vapor cartridges in combination with particulate filters would provide the minimum level of protection. Supplied air respirators can also be used in these facilities. Powered air-purifying respirators (PAPRs) (with organic vapor cartridges and particulate filters) are acceptable alternatives and may be easier for employees to wear in hot mixing rooms. Personal Protective Equipment: Gloves and aprons made from butyl rubber, TeflonTM, or TychemTM are effective in reducing skin contact with ketones to prevent skin irritation. Since diacetyl is a ketone and certain FFCD may contain more than one ketone, it is reasonable to assume that these materials may provide some protection from exposure via skin contact to diacetyl and FFCD. Chemical-resistant gloves or sleeves, or other appropriate protection for exposed skin must be used when handling liquid, paste, or powdered flavoring ingredients that could cause dermal injury (29 CFR 1910.138). Employers must also ensure that employees use chemical goggles or other appropriate eye protection when working with diacetyl and liquid FFCD when exposure to these chemicals is likely to cause injury to the eye (29 CFR 1910.133). Chemical manufacturers and importers of diacetyl and FFCD must indicate any specific applicable precautions for safe handling on the MSDS (29 CFR 1910.1200(g)(2)(viii)). Chemical manufacturers and importers must also determine generally applicable control measures such as appropriate engineering controls, work practices, or personal protective equipment, and include that information on the MSDS (29 CFR 1910.1200(g)(2)(ix)). Such information, for example, would indicate that areas where diacetyl and FFCD are present must be adequately ventilated. See more from topic source: https://www.osha.gov/html/a-z-index.html