how to measure mekp

Published by on November 13, 2020

As discussed in Section VII of the preamble, OSHA’s entire costing methodology is based on a process approach that assumes multiple chemical exposures and the use of a system of engineering controls designed to control the exposures of all employees involved in the process. OSHA comments from the January 19, 1989 Final Rule on Air Contaminants Project extracted from 54FR2332 et. For example Methyl ethyl ketone peroxide? For example, the Floyd and Stokinger study reports that MEKP is “20- to 50-fold more acutely toxic than di-t-butyl peroxide by all routes tested”; however, there is no PEL or TLV for d-t-butyl peroxide for OSHA to use as a basis for the PEL. The health effects data for MEKP in animals rely primarily on a study conducted in 1958 by Floyd and Stokinger (Ex. 86 and 155; Tr. ), (Last column is the number of square feet a given volume will cover at a thickness of 10 Mil (.010") wet. Both of the plants visited produced fiberglass boats, and personal samples were taken at both facilities for workers involved in gel-coat and lamination operations. In response to Mr. Schumacher and the National Marine Manufacturers Association (Exs. The same study notes that MEKP is significantly more toxic than benzoyl peroxide (TLV-TWA of 5 mg/m3) and resembles hydrogen peroxide in toxicity (TLV-TWA of 1.5 mg/m3) but provides no data to suggest how this “extra” toxicity might translate into a PEL. 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. Home > Forum > Testing & measuring > Active oxygen content. of Catalysts to be Used with Polyester Resins MEKP - Number of oz. 8-47, 8-86, 3-902, 144, 155, 181, and 3-1172; Tr. 136A and 136B). 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. Ft. @ 10 Mil. 8-86, 155, 3-1172, and 181; Tr. 1-783) demonstrated that MEKP is significantly more toxic than benzoyl peroxide (TLV-TWA of 5 mg/m3) and resembles hydrogen peroxide (TLV-TWA of 1.4 mg/m3) in terms of its potential to cause irritation on an acute basis. Methyl Ethyl Ketone Peroxide (MEKP) is the chemical hardener used with polyester resin. tsp. OSHA did not formerly have a limit for methyl ethyl ketone peroxide (MEKP). Measurement. According to the ACGIH (1986/Ex. 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. OSHA received several comments on the proposed PEL for MEKP (Exs. 1% … 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. 192.300.0013.0208.208. 1 tsp = 1.33. Centers for Disease Control and Prevention. 3-1172, Attachment; Exs. NIOSH concurs that a ceiling limit is appropriate for MEKP to protect against this substance’s severe irritant effects (see Table N1 of Ex. 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. Measures Chart (Example - 1 Gallon = 231 Cubic Inches and C.C. per Volume). New email subscribers will receive a 10% off Promo Code! will cover 160 Sq. 136B). 1-783). For example, in the sector of interest to Mr. Schumacher (SIC 37, Transportation Equipment), and particularly in boat-building, styrene, fiberglass, and MEKP are all used. 14.8.50. 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. In regard to sampling and analytical methods for MEKP, OSHA notes that NIOSH has published a sampling and analytical method (PECA or 3508) for this substance and that OSHA has developed an in-house method that is available from the Agency on request; OSHA used this method without difficulty on the two site visits to MEKP-using facilities conducted for this rulemaking. 1-3, p. 54) showed that exposure to 12.2 mg/m3 benzoyl peroxide caused “pronounced irritation of the nose and throat” in workers; because MEKP is significantly more irritant than benzoyl peroxide, MEKP concentrations considerably below the 12 mg/m3 level can be expected to cause irritation as well. CC Oz. You will be subject to the destination website's privacy policy when you follow the link. Fluid Ounce. Use approximately 1/2 oz per quart of resin. HE 78-003-555). 8-86 and 155). 4.72.167. Tbsp. OSHA does not agree with Mr. Schumacher on either point. ), This website uses cookies to ensure you receive the best experience. 8-47, Table N1) concurred with this limit. Linking to a non-federal website does not constitute an endorsement by CDC or any of its employees of the sponsors or the information and products presented on the website. 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). MEKP is sold commercially as a colorless liquid mixture consisting of approximately 60 percent MEKP and 40 percent diluent; the diluent is added to reduce MEKP’s sensitivity to shock. 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). 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. 155) was also of the opinion that OSHA had failed, in either the proposal or its supporting documents, to take into account the fact that a facility having multiple exposures would have to design its engineering controls to handle multiple chemicals; in the opinion of Mr. Schumacher, to control for multiple chemicals in a facility would be more expensive than controlling for a single substance. 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. In this tutorial, we will show you two recommended techniques for measuring and mixing epoxy resins by weight or volume. 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. HE 79-132-673; HE 76-000-066; and HE 78-003-555). 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. NIOSH (Ex. Learn More, 385 Carr DriveBrookville, OH 45309Phone: 800-838-8984Fax: 937-833-6555, Join our email list and get exclusive sales, by titration or any method. 1. 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. Specific gravity  MEK peroxide expert articles and tips, and new product offers. At two of the three sites surveyed, all personal and area MEKP air samples were below 1.5-mg/m3. Drop MEKP. The Motor Vehicle Manufacturers Association (MVMA) (Ex. OSHA also conducted two site visits to MEKP-using facilities in connection with the present rulemaking (Exs. The Floyd and Stokinger study (1958/Ex. 8-47). 1-783). Catalyst Chart Volume of Catalyst to Be Used with Polyester Resins Methyl Ethyl Ketone Peroxide-Percent by Weight 1% 1.25% 1.5% 1.75% Resin(1) Volume Drop cc oz Drop cc oz Drop cc oz Drop cc oz 4 ounce 32 1-1/4 1/32 40 1-1/2 3/64 48 1-3/4 1/16 56 2 1/16+

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