Bonding and grounding two non-conductive containers would seem unnecessary, since non-conductive materials are insulators and therefore cannot conduct current through them. However, static electrical charge can be generated when two dissimilar materials pass quickly by one another (i.e., liquids flowing through pipes, even air). OSHA recognizes that there are many factors that affect the size and strength of the static charge or potential that may develop (i.e., speed of transfer, humidity, container size, and others). OSHA is concerned that any static charge that develops between two containers be equalized, if not eliminated, so that no potential for a static discharge between the containers exists. Therefore, OSHA will permit the transfer of Class I liquids between plastic or other non-conductive containers under the following conditions: