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Description of key information

Key value for chemical safety assessment

Skin irritation / corrosion

Link to relevant study records
Reference
Endpoint:
skin irritation: in vivo
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: As this study was pre-GLP, detail in the report is lacking but the study was conducted in a state-of-the-art facility to the standards of the time.
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 404 (Acute Dermal Irritation / Corrosion)
Deviations:
not specified
GLP compliance:
no
Species:
guinea pig
Strain:
not specified
Type of coverage:
semiocclusive
Preparation of test site:
not specified
Vehicle:
not specified
Irritation parameter:
other:
Basis:
other:
Remarks on result:
other: Scoring was based on observation and not done with a numerical scale
Interpretation of results:
slightly irritating
Remarks:
Migrated information Criteria used for interpretation of results: not specified
Conclusions:
Methyl n-propyl ketone was considered to be a slight skin irritant.
Executive summary:

Methyl n-propyl ketone was applied to the skin of Guinea Pigs. The test article was considered to be a slight skin irritant.

Endpoint conclusion
Endpoint conclusion:
adverse effect observed (irritating)

Eye irritation

Link to relevant study records
Reference
Endpoint:
eye irritation: in vivo
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: The study was done in a GLP facility to OECD guidelines
Qualifier:
according to
Guideline:
EPA OTS 798.4500 (Acute Eye Irritation)
Deviations:
not applicable
GLP compliance:
yes
Species:
rabbit
Strain:
New Zealand White
Details on test animals or tissues and environmental conditions:
SPECIES: Rabbit
STRAIN/SOURCE: New Zealand White, HRP, Inc. (Denver, PA)
AGE ON RECEIPT: At least 16 weeks
NUMBER AND SEX: 6 females (nulliparous and non-pregnant)
WEIGHT: 2.47- 2.93 kg at receipt
IDENTIFICATION: Unique number written in one ear with an indelible marker and corresponding cage card
JUSTIFICATION OF USE: The rabbit is the recommended species for this test


The rabbits were held in quarantine for approximately 7 days after receipt. They were housed individually in stainless steel cages with screen-bottom floors. Environmental controls maintained temperatures of 60.8- 69.8°F, and humidity at 50± 10%. A 12-hour light:dark cycle was maintained. Air flow was regulated at 1 0 or more air changes per hour.




Vehicle:
unchanged (no vehicle)
Controls:
not required
Amount / concentration applied:
Each animal received 0.1 ml of the test substance, which was instilled into the conjunctival sac of the left eye. The lids were held closed for 1 second to prevent loss of the material. The other eye was untreated and served as a control.
Duration of treatment / exposure:
All treated eyes were examined for ocular irritation at 1, 24, 48, 72 and 96 hours and 7 days after
instillation.
Observation period (in vivo):
All treated eyes were examined for ocular irritation at 1, 24, 48, 72 and 96 hours and 7 days after
instillation.
Number of animals or in vitro replicates:
6 Female rabbits
Details on study design:
Six naive female rabbits, free of ocular irritation, were assigned to the study. Each animal received 0.1 ml of the test substance, which was instilled into the conjunctival sac of the left eye. The lids were held closed for 1 second to prevent loss of the material. The other eye was untreated
and served as a control. All treated eyes were examined for ocular irritation at 1, 24, 48, 72 and 96 hours and 7 days after instillation. Sodium fluorescein stain was used at all examinations except at one hour. Irritation was graded and scored by the Draize technique. A rating was assessed using the method of Draize, Woodard and Calvery and assigned a category as used by the EPA. Clinical observations recorded once daily included, but were not limited to:
A. Any response with respect to body position, activity, coordination, or gait.
B. Any unusual behavior such as head flicking, compulsive biting or licking, circling, etc.
C. The presence of: Convulsions or tremors, increased salivation, increased lacrimation, increased or decreased urination or defecation (including diarrhea), piloerection, mydriasis or miosis (enlarged or constricted pupils), unusual respiration (fast, slow, gasping, or retching), unusual vocalization.
On SO 9, all the animals on study were killed with an overdose of sodium pentobarbital and discarded.

All of the eyes exposed to Eastman MPK developed a mild corneal opacity within 1-96 hours after instillation. The opacities were never more severe than Grade 1, and generally covered 1/2- 3/4 of the corneal surface. Positive uptake of the sodium fluorescein did indicate sloughing of the corneal epithelium. Three of the six treated eyes also exhibited a positive iris score. Conjunctival irritation was most prominent at the 1, 24 and 48 hour examinations, and consisted of mild redness, chemosis and discharge. Recovery from the ocular effects was observed in all rabbits at 7 days. A maximum mean irritation index of 12.83/110, calculated at one hour, classifies Eastman MPK as mildly irritating. The presence of positive corneal and iris responses also classifies the material as a positive irritant. Since all effects had cleared in 7 days, the material is a Category Ill substance

SUMMARY OF OCULAR SCORING
Animal Number  Group-Sex 1Hr SD 1 SD 2 SD 3 SD 4 SD 7
               
H931 Group 1 - Female  6 12 0 0 0 0
H932  Group 1 - Female  6 7 2 0 0 0
H933  Group 1 - Female  10 22 2 0 0 0
H934  Group 1 - Female  18 4 2 5 0 0
H935  Group 1 - Female  25 2 7 0 0 0
H936  Group 1 - Female  12 2 2 0 10 0
Group 1 Mean Score 12.83 8.17 2.5 0.83 1.67 0
Interpretation of results:
irritating
Remarks:
Migrated information Criteria used for interpretation of results: US CPSC / US OSHA
Conclusions:
A maximum mean irritation index of 12.83/110, calculated at one hour, classifies Eastman MPK as
mildly irritating. The presence of positive corneal and iris responses also classifies the material as a
positive irritant. Since all effects had cleared in 7 days, the material is a Category Ill substance.
Executive summary:

Six female rabbits were exposed to 0.1 ml of Eastman MPK which was instilled into the conjunctival sac of one eye. Observations to detect ocular irritation were made at 1 , 24, 48, 72 and 96 hours and 7 days after exposure. The study ended on SD 9. The rabbits were killed with an overdose of sodium pentobarbital and discarded. Eastman MPK is a mildly irritating substance, based on a maximum mean irritation index of 12.83/11.0 , calculated at one hour after exposure. Positive corneal and iris responses were observed in 6/6 and 3/6 treated eyes, respectively. Conjunctivitis was also noted in 6/6 rabbit eyes. Recovery from the ocular effects was noted in all animals at 7 days. Eastman MPK is a positive irritant, and is a Category Ill substance

Endpoint conclusion
Endpoint conclusion:
adverse effect observed (irritating)

Respiratory irritation

Endpoint conclusion
Endpoint conclusion:
no study available

Additional information

Methyl n-Propyl Ketone was moderately irritating to the eyes of rabbits and slightly irritating to the skin of guinea pigs. The studies were done prior to GLP so the reports are lacking in documentation, but they were conducted in a high quality facility to the standards of the day.


Justification for selection of eye irritation endpoint:
The study was a modern, well documented study. Study .001 lacked documentation and detail to establish classification.

Effects on skin irritation/corrosion: slightly irritating

Effects on eye irritation: moderately irritating

Justification for classification or non-classification

Acute eye irritation testing supports a category 2 classification