What are food preservatives? Md. Saifur Rahman The chemical substances which when used in limited amounts can be preserved for a long time through the processing of food substances are called food preservatives.You may likeDo I need car insurance?What is car insurance?How could I get cheaper car insurance?What is auto insurance?Why Adulterant food is the barrier to sound health?What are the producers?What are food preservatives?What is food chain?What is tertiary consumer?