Types & Uses
Of Antistatic & Conductive FIBCs
Some Facts About Conductive Bags
The FIBCs known as “Type C Bags” have interwoven conductive threads which are all reliably interconnected and MUST BE GROUNDED. Dangerous static charge is safely dissipated to ground. Type C bags do not cause any discharges. But the most important condition is a reliable connection to ground during lling and emptying operations. To prevent grounding errors, Type C bags are additionally equipped with conductive loops in order to achieve contact to the hoist system, providing it has a path to ground. If this FIBC remains ungrounded and grounded objects are approaching, spark discharges will occur which can ignite gases, vapours and dusts.
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Causes of electrostatic charging
Electrostatic charging is generated when separating a non-conductive material from another one (either non- conductive or conductive) which were in close contact with one another. When lling or discharging an FIBC, an electrostatic charge accumulates to the top of the lled material and also on the inner walls of the FIBC. These charges are built up by virtue of the resistance of the materials.
The amount of charge of a product depends on the:
- Electrical resistance of materials,
- Triboelectric properties of both materials,
- Separation speed,
- Electrical properties of product feeding systems.
Causes of electrostatic charging
Electrostatic charges are not dangerous by themselves but they may be dangerous when there is a risk of gas discharge. Different types of gas discharges are as follows:
Brush discharges: In general they are capable of igniting gases and vapours but not dusts,
Corona discharges: In general they are not capable of igniting combustible atmospheres,
Spark discharges: In general they are capable of igniting gases and vapours but not dusts,
Propagating brush discharges: They are so strong that they are capable of igniting not only gases and vapours but also dusts could be ignited.
During the lling process the strongest electrostatic charge occurrence is to be expected. Transporting itself does not increase static electricity.
During the emptying process, static charging must again be taken into account.
The table below will help you to identify the style of bag required depending on the sensitivity to ignition of the products being packaged and the surrounding atmospheric conditions. The sensitivity to ignition of the product being packaged is de ned by its minimum ignition energy properties, or MIE. The surroundings are classi ed in increasing sensitivity to ignition by electrostatic discharges as non- ammable, explosive dust atmosphere and explosive gas or vapours.
Hazard Zone Where Type A, Type B, Type C and Type D Bulk Bags Can Be Used
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