3-902) merely listed MEKP as a substance for which rulemaking should be delayed; however, the MVMA provided no details in support of this comment. In this tutorial, we will show you two recommended techniques for measuring and mixing epoxy resins by weight or volume. 1% … 3 … Catalyst Concentration & Equivalent Measure Chart Catalyst Concentration Chart (volume of catalyst to be used with Resins & Gel Coat - MEKP - Percent by Weight) Cubic Centimeters & Ounces Resin Volume 1/2% 3/4% 1% 1-1/2% 2% CC Oz. In response to Mr. Schumacher and the National Marine Manufacturers Association (Exs. will cover 160 Sq. At the third site, a total of 20 short-term samples were taken over a three-day period to determine airborne MEKP exposures during the construction of fibrous glass reinforced products utilizing the styrenemodified polyester resin sprayup process and a MEKP catalyst; eight of these short-term samples exceeded the 1.5-mg/m3 (0.2-ppm) level (NIOSH Health Hazard Evaluation Determination Report No. 86 and 155; Tr. Available in 8 lb size by phone order only: (888) 827-7330 Mon-Fri 9 am to 5 pm (PST). OSHA believes this is a reasonable costing methodology because multiple chemicals are used at most processes. 8-47, 8-86, 3-902, 144, 155, 181, and 3-1172; Tr. OSHA also conducted two site visits to MEKP-using facilities in connection with the present rulemaking (Exs. 3-1172, Attachment; Exs. seq. OSHA comments from the January 19, 1989 Final Rule on Air Contaminants Project extracted from 54FR2332 et. This rule was remanded by the U.S. tsp. The Centers for Disease Control and Prevention (CDC) cannot attest to the accuracy of a non-federal website. Therefore, to reduce the significant risk of irritation to workers who are exposed to MEKP at higher levels, OSHA is establishing a 0.7 ppm ceiling PEL for MEKP. Specific gravity MEK peroxide of Catalysts to be Used with Polyester Resins MEKP - Number of oz. OSHA received several comments on the proposed PEL for MEKP (Exs. 1-783). In a series of experiments conducted in rats, mice, and rabbits to determine the toxicity of MEKP by various routes of exposure, these investigators found that inhalation exposure for four hours to a concentration of 200 ppm was fatal to 50 percent of rats, and a four-hour exposure to 170 ppm was fatal to 50 percent of mice. by titration or any method. The Motor Vehicle Manufacturers Association (MVMA) (Ex. 8-47) has carefully reviewed the health effects information and the limits proposed for MEKP by OSHA. Measuring accurately and mixing thoroughly is essential to making sure your epoxy resin cures properly.There are 3 simple steps when m Epoxy resin comes in two parts: a resin and a hardener. In the final rule, OSHA has determined that the data available at the present time indicate that 0.7 ppm (approximately 5 mg/m3) is an appropriate level at which to establish a PEL, and the final rule establishes this limit. Monday, 16 November 2020 . The New Jersey Department of Health (Ex. 136B). per Volume). The direct application of MEKP to closely shaved rabbit skin caused no immediate discomfort but did cause a severe delayed reaction, consisting of erythema, edema, and vesiculation within two or three days; of the four organic peroxides tested (di-t-butyl peroxide, t-butyl hydroperoxide, cumene hydroperoxide, and methyl ethyl ketone peroxide), MEKP exhibited the greatest toxicity. Fluid Ounce. Dispensers are advised for accuracy. Sax and Lewis (1989, p. 2312) report that MEKP is an experimental tumorigen and note that systemic effects in humans resulting from oral exposure include changes in the structure or function of the esophagus, nausea or vomiting, and other gastrointestinal effects. In addition, this commenter stated that information is lacking as to what concentrations of MEKP currently exist in the workplace, how to measure MEKP in the occupational environment, and the feasibility of engineering controls to regulate exposures to MEKP (Ex. ), (Last column is the number of square feet a given volume will cover at a thickness of 10 Mil (.010") wet. Tbsp. HE 78-003-555). Methyl Ethyl Ketone Peroxide (MEKP) is the chemical hardener used with polyester resin. 14.8.50. A study by Moskowitz and Grabois (1950, as cited in ACGIH 1986/Ex. The maximal nonirritating strength of MEKP applied dermally was 0.6 percent. 1-783). Catalyst agents are usually sold with the hardener but can be purchased separately as well. 1-3, p. 396), this study demonstrated that MEKP was “20- to 50-fold more acutely toxic than di-t-butyl peroxide by all routes tested.” The consequences of exposure to this substance ranged from skin and eye irritation to gross hemorrhage of the lung and liver and kidney damage; OSHA notes that these effects were observed even after short-term exposures. C.C. OSHA believes that the higher reading at the second facility is accounted for by the high rate of production at that site; controlling exposures at a high-volume facility requires the implementation of additional controls to compensate for the increase in production. NIOSH (Ex. 3-1172, Attachment; Exs. Ounces (Volume 11-265/266). 1-783) was a thorough and comprehensive bioassay involving three species (mice, rats, and rabbits) and five routes of exposure (inhalation, intraperitoneal, oral, dermal, and eye contact). CC Oz. ft. @ 10 mils. The Floyd and Stokinger study (1958/Ex. In the low-production facility, all MEKP sampling results for gel-coat and lamination workers were below 1.5-mg/m3 for MEKP (Ex. Resins MEKP - Number of cc per Volume), Catalyst Concentration by 192.300.0013.0208.208. Use approximately 1/2 oz per quart of resin. CDC is not responsible for Section 508 compliance (accessibility) on other federal or private website. Active oxygen content. One plant was a high-volume facility that produced approximately 24 boats per day, while the other plant produced only two to three boats per day. Mr. Schumacher (Ex. Cubic Inch(es) Gallon(s) Cup(s) Sq. Click here for TAP MEKP Liquid Catalyst label. OSHA does not agree with Mr. Schumacher on either point. Mixing the resin and hardener together prompts a chemical reaction between the two, transforming them from a liquid into a solid. 1 Tbs = 3. Given that MEKP is reported by Floyd and Stokinger to be more irritating than benzoyl peroxide and that irritation can result from even very brief exposures to excessive concentrations of MEKP, OSHA also concludes that a ceiling limit for MEKP is necessary and appropriate. Drop MEKP. 8-47, Table N1) concurred with this limit. Measurement. Accordingly, OSHA has concluded that, at this time, the available data support establishing a PEL for MEKP that is at least equivalent to that for benzoyl peroxide (i.e., 5 mg/m3, which is approximately equivalent to 0.7 ppm for MEKP). Home > Forum > Testing & measuring > Active oxygen content. Inhalation of MEKP vapors produced petechial and gross hemorrhages of the lungs in rats after four-hour exposures; liver and kidney damage was also observed (Floyd and Stokinger 1958/Ex. CC Oz. How to determine active oxygen content in Organic peroxide liquid sample. Ft. @ 10 Mil. Centers for Disease Control and Prevention. The Agency proposed a PEL of 0.2 ppm (1.5 mg/m 3) as a ceiling for this substance to protect workers against the significant risk of eye and skin irritation, as well as kidney and liver damage; this limit is consistent with that of the ACGIH.
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