The Science Of Static Protection in Bulk Bags: For 2018

By troy_lott Static Protection in Bulk Bags With 0 Comments

When handling sensitive bulk powders, or filling and discharging where flammable gases or vapors are present, static protection is essential to prevent a fire or catastrophic explosion. Electrostatic FIBCs offer static protection in the form of either a Type C or Type D bulk bag.

*Download the free updated FIBC Handling Guidelines, below.

Type C FIBC:

A Type C, or conductive bulk bag, is made from conductive fabric which, unlike standard polypropylene fabric, is woven with conductive threads or tapes. Conductive fabric can be unidirectional, where the conductive tapes are in a stripe pattern, or bidirectional, where the conductive tapes are in a grid pattern.

Construction of the Type C Super Sack® container, with the interconnection of grounding tabs and conductive fabric, allows for the continuous collection of charges both inside and outside the bag. Prior to filling or discharging, a grounding wire must be attached to the grounding tab on the Super Sack® container and a grounding terminal. Electrostatic charges are dissipated through the conductive fabric and discharged via the grounding tab to ground.

When grounded properly, the conductive bag prevents electrostatic discharge such as incendiary sparks, brush discharges, and propagating brush discharges. The bulk bag shall have a resistance to ground of less than 1.0 x 108 ohms. These FIBCs can be used in dust zones 21 and 22 and in gas zones 1 and 2 (explosion groups IIA/IIB), providing they are properly grounded.

The allowable liner options for use in Type C bags are types L1, L1C and L2. BAG Corp offers anti-static polyethylene liners that meet the FDA requirements for food grade packaging.

Type D FIBC:

A Type D FIBC, or a static dissipative bulk bag, is made from static protective fabric. Unlike standard woven polypropylene fabric, the static protective fabric is woven with static dissipative threads. Electrostatic protection is provided by safely dissipating charges through the fabric and directly into the atmosphere by a process called corona. Corona is one form of electrostatic discharge but is low energy and not incendiary to flammable or explosive atmospheres. Grounding of a Type D bulk bag is not necessary.

The allowable liner option for use in Type D bags is type L2. Antistatic liners may be used, but only after testing has been conducted to ensure safety. Have your specific product tested by a 3rd party lab to determine whether Type C or Type D bulk bags are right for you.

BAG Corp manufactures Type D Super Sack® containers using CROHMIQ® blue and CROHMIQ® white fabric. CROHMIQ® fabric has been used in packaging over 50 billion pounds of chemicals without any incident of fire or explosion. Type C or Type D Super Sack® containers, along with a diverse inventory of bulk bags, are available through our online store for immediate shipment from our warehouse. If you need assistance developing an inventory stocking strategy or require a custom bulk bag solution, you can speak directly to one of our expert product sales specialist for assistance.


To download your free .pdf copy of the updated FIBC Handling Guidelines, click here.

The newly released ‘Standard test methods for specific applications - Electrostatic classification of flexible intermediate bulk containers (FIBC)’, IEC 61340-4-4:2018 is now available to purchase online.

About BAG Corp:

BAG Corp is a bulk bag industry leader, innovating processes through experience. As a developer, manufacturer, supply chain and logistics provider, we move product around the world and meet customer inventory needs every day. BAG Corp services global brands, represented across a broad spectrum of industry verticals.