1. If the particle size of the animal by-products to be rendered is more than 150 millimetres, the animal by-products shall be reduced in size using equipment specified in the licence, set so that the particle size after reduction is no greater than 150 millimetres or such smaller size as the licence shall specify. The effectiveness of the equipment shall be checked daily and its condition recorded. If checks disclose the existence of particles larger than is permitted in the licence, the process shall be stopped and repairs made before the process is resumed.
2. After reduction the animal by-products shall be heated to a core temperature greater than 100°C for at least 125 minutes, a core temperature greater than 110°C for at least 120 minutes and a core temperature greater than 120°C for at least 50 minutes.
3. The rendering shall be carried out in a batch system.
4. The animal by-products may be cooked such that the time-temperature requirements are achieved at the same time.