Division 3.7.2.1 Hazard categories United Kingdom Original text. Later amendments are not shown. 3.7.2.1.1For the purpose of classification for reproductive toxicity, substances are allocated to one of two categories. Within each category, effects on sexual function and fertility, and on development, are considered separately. In addition, effects on lactation are allocated to a separate hazard category. ← Division 3.7.2 Division 3.7.2.1 Division 3.7.2.1.1 →