MODEL Ais appropriate for most applications. All sacks are resistant against rot under sun. There are no strict rules during the production phase.
MODEL Breduces the static electrification during the agent transportation. USE IN DANGEROUS ENVIRONMENT IS UNAPPROPRIATE. If there is an explosion risk, then Model C or D must be used.
MODEL CConducts all static electricity instantly to the ground. This sack has a perquisite of soiling.
MODEL Dspreads the static electricity to the atmosphere in a controlled manner. This sach has no prequisite of soiling.