Registration Dossier

Administrative data

Description of key information

Irritating to the skin.
Not irritating to the eyes.

Key value for chemical safety assessment

Additional information

There are no skin and eye irritation data available on isoheptane. However, there are reliable data available for another category member. Thus, read-across was conducted based on a category-approach.

In a primary skin irritation study (Chevron Phillips Chemicals, 1982), iso-octane was applied to the intact skin of rabbits for 24 hours. At 72 hours post application, very slight erythema (grade 1) were observed in 3 of 6 rabbits. No other dermal effects were noted in the study. Based on persistent irritation at premature study termination (reversibility was not seen 72 hours after application), iso-octane was considered to be skin irritating.

The eye irritation potential of iso-octane was determined by instillation of 0.1 mL of the test material into the conjunctival sac of rabbits with subsequent washing (Chevron Phillips Chemicals, 1982). Conjunctival redness (grade 2) was noted in 4 of 6 rabbits at 1 hour post instillation and persisted in one rabbit to 24 hours. The redness reversed by 48 hours. No corneal opacity, iritis, conjunctival chemosis, or discharge was noted in any of the 6 rabbits.

In another primary eye irritation study of Chevron Phillips Chemicals (1982), the treated eyes of all animals remained unwashed. Conjunctival redness (grade 2) was noted in 3 of 6 rabbits at 1 hour post instillation and persisted in two rabbits to 24 hours. All redness reversed by 48 hours. No corneal opacity, iritis, conjunctival chemosis, or discharge was noted in any of the 6 rabbits.

Justification for classification or non-classification

According to Annex 1 to Directive 67/548/EEC, iso-heptane is classified as skin irritant.

DSD: R38

CLP: Skin Irritation Category 2

 

Based on read-across from a structurally related substance within a category approach, the available data on the eye irritating potential of isoheptane are conclusive but not sufficient for classification.