A static protective FIBC is a bag that incorporates design features to protect against the hazards created by static electricity. An evaluation of the materials used, machinery, and the process is required to determine the static discharge hazard and the level of static protection required.

A static dissipative FIBC is a type of static protective bulk bag made from fabric that allows static electricity to discharge safely. Static electricity may be dissipated to ground via conduction through a grounding cable or may be dissipated into the atmosphere via a process called air ionization or corona, without the need for grounding.

The term “antistatic FIBC” is sometimes used as a synonym for static protective FIBC. It is also used to describe FIBCs that offer some protection against static electrical hazards, but do not incorporate the charge dissipation mechanisms found in bulk bags that offer full static protection.

IMPORTANT NOTE!   Always ensure that the FIBCs are tested and labeled in accordance with IEC 61340-4-4 Ed. 3.0 and that the type of static protective FIBC being used is appropriate for the flammable or explosive environment.

There are primarily three types of bags for controlling the static charge associated with some processes:

Type B
A type “B” bag is constructed from insulating fabric with a breakdown voltage of less than 6 kV.  This provision prevents the risk of energetic sparks and propagating brush discharges which can ignite dust-air mixtures and flammable gases and solvent vapors.  Type “B” bags may be used in the presence of the combustible dusts with MIE greater than 3mJ, but only in the absence of flammable vapors of gases. Type “B” bags are sometimes called antistatic bags, but it should be noted that type “B” bags only provide limited protection against static electricity and they do not provide any mechanism for dissipating static charge.

  • Used safely to transport dry, combustible powders (MIE > 3 mJ)
  • There are to be no flammable solvents or gases present around the bag
  • DO NOT USE to transport flammable products (MIE < 3 mJ)

Type C
A type “C” bag is constructed from fabrics having inter-connected conductive threads and designed to prevent the occurrence of incendiary sparks, brush discharges, and propagating brush discharges.  The bag must be electrically grounded during filling and emptying.

  • Used safely to transport flammable powders
  • Used safely when flammable solvents or gases are present around the bag
  • DO NOT USE when the ground connection is not present or has become damaged

Type D
A type “D” bag is constructed from static protective fabric that includes interwoven static dissipative threads and designed to prevent the occurrence of incendiary sparks, brush discharges, and propagating brush discharges.  Type D FIBC’s do not require grounding.

  • Used safely to transport flammable powders
  • Used safely when flammable solvents or gases are present around the bag
  • DO NOT USE when the surface is contaminated or coated with conductive products such as water or grease.

IMPORTANT NOTE!  Type A FIBC’s are made from fabric or plastic sheet without any measures against the buildup of static electricity.

Always check with your FIBC manufacturer that your static protective FIBC is fitted with the correct anti-static liner before handling.  The chart below is only a general guideline.  Always reference the current IEC standard for all of the requirements.

Inner liners and FIBC: combinations that are permissible and not permissible in hazardous explosive atmospheres

FIBC

 

  INNER LINER  
Type L1 Type L2 Type L3
TYPE B Not Permissible Permissible Permissible
TYPE C Permissible Permissible Not Permissible
TYPE D Not Permissible Permissible

Not Permissible

Important!  Always reference the ISO standard for the current requirements.