Metal conveyor belts easily meet sanitation requirements: A recall is an enormous headache for those in the food manufacturing industry. Not only can it be extremely expensive, it can also do irreparable damage to a manufacturer's reputation. Metal belts are capable of withstanding the extremely high temperatures and pressure required for sanitation. An additional benefit to metal belts is that they are nonporous. Plastic belts are easily chipped and scratched which can become ideal locations for hazardous chemicals or bacteria.