Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Combined Repeated Dose Toxicity Study with Reproduction/Developmental Toxicity Screening Test with 1,6-Hexamethylene Diisocyanate in the Sprague-Dawley Rat, with Cover Letter dated 06/21/1999.
CORP Author Chemical Manufacturers Association, Washington, DC.; Bayer Corp., Pittsburgh, PA.; Environmental Protection Agency, Washington, DC. Office of Toxic Substances.
Year Published 1999
Stock Number OTS0573912
Additional Subjects Toxicology ; Health effects ; 1 ; 6-hexamethylene diisocyanate ; Reproduction ; Fertility effects ; Teratogenicity ; Mammals ; Rats ; Inhalation ; Neurotoxicity ; CAS No 822-06-0
Library Call Number Additional Info Location Last
NTIS  OTS0573912 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 09/09/2010
Collation 831p
A combined reproductive/developm ental/neurotoxicity study was conducted with 1,6-Hexamethylene diisocyanate (HDI) in the Sprague-Dawley rat. Specifically, 120 rats (15 sex/dose group) were exposed, via whole-body exposure, to either 0, 0.005, 0.050, or 0.300 ppm HDI for 6 hours/day during a 14-day premating phase, up to a 14-day mating phase, and a 21-day gestation phase. Following the gestation phase the dams were transferred to nesting cages and permitted to deliver. The dams and their litters were maintained for a 4-day lactation phase during which exposure to HDI was discontinued. Neurotoxicity evaluations were conducted on 10 animals/sex/dose group prior to exposure and following the premating phase. Prior to termination, neurotoxicity evaluations were conducted on the 10 males/group which had previously been tested, and those females which had been previously tested and had delivered pups (10/control, 8/level 1, 9/Ievel II, and 8/level III). The neurotoxicity examinations included a functional observation battery as well as the assessment of motor and locomotor activity. Body weight and clinical observations were recorded throughout the study. Following the mating phase (males) and on lactation day 4 (females and pups) the animals were sacrificed and a gross necropsy was performed. Tissues retained for microscopic examination from all adult animals included thereproductive organs, nasal turbinates (multiple sections), trachea, larynx, and lung. In those animals that underwent the final neurotoxicity testing, blood was taken for hematology and clinical chemistry evaluation and additional tissues were retained for microscopic examination, including the brain, spinal cord, stomach, small and large intestines, liver, kidneys, adrenals, spleen, heart, thymus, urinary bladder, lymph nodes, peripheral nerve, and a section ofbone marrow. With the exception of the tissues from the respiratory tract, for which all females from all dose groups were examined, the remaining tissues were initially examined in the control and high-dose groups. In addition to the endpoints noted above, the animals were evaluated for the effect of the test compound on mating, fertility, gestation length, litter size, pup sex ratio, and pup viability.