What is a key property of food-grade lubricants?

A key property of food-grade lubricants is that they are non-toxic and safe for food contact. This means that these lubricants are specifically formulated to avoid harmful substances that could contaminate food during processing or packaging. This characteristic is essential because food-grade lubricants are used in environments where they may come into direct contact with food products, making safety a top priority.

In settings such as food processing plants, this property ensures compliance with strict health regulations and helps prevent any risk of foodborne illness from contaminants. By using lubricants that are approved for food contact, manufacturers can maintain product safety and consumer trust.

The other options do not fully encompass the fundamental requirement of food-grade lubricants; while temperature tolerance may be relevant in some cases, it is not a defining feature specific to food-grade lubricants. Low viscosity may be desirable in certain applications, but it isn't the only qualifier for food-grade status. Similarly, electrical conductivity is not a relevant property for lubricants used in food applications and could even be undesirable in many scenarios. Thus, the primary defining property for food-grade lubricants remains their non-toxic nature and safety for food contact.