- We are leading manufacturer and exporter of BMC 500 LTR Bulk Milk Chiller. we are Cooling & Maintaining Milk Quality At 4&d°C. The most important part of a collecting centre of milk is the bulk milk cooler (BMC). When the milk is extracted, it is at around 37°C. If the milk continues to remain at room temperature after extraction, bacterial growth will affect the quality of the milk. The BMC is meant to cool the milk to 4°C in a prescribed time. The BMC is available in different shapes and sizes which depending on the amount of milk to be cooled and the system of cooling.