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Conductive / Antistatic Bulk Bag

   Some bulk materials can create static electricity during filling and discharging which may cause an electrostatic discharge in the bag or on the surface. If there is flammable dust or gas in the atmosphere during the filling and discharging process, it may cause a serious fire or an explosion. To prevent such a danger, conductive (antistatic) FIBCs are the ideal packaging. Conductive bags are also called groundable bags. Dino Bags can provide you with 3 types of conductive bulk packaging products: Type B, C and D FIBCs. Every conductive bag produced at Dino Bags is 100 % checked and labeled for its conductivity. 
  The IEC standard covering the electrostatic classification of flexible intermediate bulk containers (FIBC) has just been updated.
The new standard is now available and links have been provided below to purchase edition 2.1 on the IEC Webstore. The biggest change from edition 2.0 is that the labeling requirements have been changed to improve clarity and ease of recognition by end users. Be sure your Type B, C and D labels are updated to comply with the new standard. 

IEC 61340-4-4 edition 2.1 (Released November 11, 2014)
Electrostatics – Part 4-4: Standard test methods for specific applications – Electrostatic classification of flexible intermediate bulk containers (FIBC)

Link to Purchase:  https://webstore.iec.ch/publication/5337
New Electrostatic Standard IEC 
www.labordata.com

Conductive Bulk Bags (Type-B Bulk Bag):

Type of FIBC that can hold (absorb) static electricity inside of the bag up to 6 KV. If static electricity discharges are higher then 6 kV, it overflows to the outside of the FIBC. Our Type B conductive FIBCs are made from special fabric. 
PS. Type A bulk bags - no special static protection mechanism. Should not normally be used where a flammable atmosphere is present.

Conductive / Groundable Bulk Bags (Type-C Bulk Bag):


type c antistatic bag  Type C bags are made entirely from conductive fabric or from a non-conductive fabric with interconnected conductive threads or filaments.
  FIBC Type C must be provided with a grounding point (grounding tab location at type-C bags) to which all conductive panels, threads or filaments are electrically bonded. The resistance to the grounding point from anywhere on a conductive fabric and from conductive threads or filaments must be less than 108 .
   The lift loops (Carbon tapes at type C bulk bags loops) of FIBC Type C must also contain conductive threads or filaments with a resistance to the grounding point of less than 108.


 

 

Static Dissipative / Conductive Bulk Bags (Type-D):

type d antistatic bag    Type D bulk bags are constructed from fabrics with static dissipative threads and/or properties to control discharge incendivity. Do not require grounding during use. The use of Type D bags are much more practical than the groundable bags and they avoid operator errors. The special construction of the Type D fabric eliminates the need of an earth connection during the filling and discharging of materials. type d antistatic bag design drawing 
    Crohmiq is the first true Type D fabric to appear in the market place since the early 1990s. The fabric was developed to cover a growing need for an ungrounded static protective solution for bulk packaging.   Due to its reputable safety record, as of today, over 500 leading companies worldwide prefer FIBCs manufactured from Crohmiq fabric for their static bulk bag packaging requirements. Today Crohmiq is the only Type D fabric in the market which complies with the IEC standards. 

 

Why type D?

    Unlike Type C FIBC's, Type D FIBC's do not require grounding. They can be used for the transportation of flammable powders, or when flammable solvents or gases are present around the FIBC. 
   Type D bags provides safety that is equal to a grounded Type C FIBC without the human error risk factor. Type D fabric permits the dissipation of the charges in to the atmosphere by corona discharge. A corona discharge is one form of an electrostatic discharge with a low energy, unlike sparks or brush discharges, it does not give way to ignition of flammable or explosive atmospheres.

Why Crohmiq Blue fabric?

    Only CROHMIQ's patented technology provides a level of safety equal to a properly grounded Type C FIBC, but without the risks of human error. For these reasons, leading global companies continue to switch from Type C FIBC to the optimum safety of CROHMIQ FIBC.
    CROHMIQ 's properties are permanent, therefore, its static dissipative performance does not decay with time nor wash off during wet reconditioning processes as many pseudo Type D FIBC's do.
    • CROHMIQ fabric is FDA compliant.
    • Internationally recognized as the leading Type D static protective FIBC fabric. 
    • It is the only Type D fabric that will comply with the IEC61340 - 4 - 4: 2005 standards. 
 

Safe use of different FIBC types
Product inside FIBC Atmosphere surrounding FIBC
Non-flammable Explosive dust Explosive gas or vapor
Non-flammable   MIE > 100mJ A   B   C   D B   C   D C   D
MIE 3 mJ to 100mJ B   C   D B   C   D C   D
MIE < 3mJ C   D C   D C   D
USING FIBCs WITH INSIDE LINERS 

Selecting and using a suitable type of FIBC and liner combination is one of the important steps to prevent the risk of fire and explosion hazards. There are 3 different types of liners that are permitted to be used in a particular type of FIBC depending on the electrostatic properties of the liner material. Depending on the liner type, the following physical and electrostatic properties may need to be determined ensure the suitable type of liners:

Type L1 Liner (Conductive)

Type L1 Liner should meet the following criteria:

   •  Made from materials with Surface Resistivity on at least one surface = 1.0x10Ohm per Square.
   •  If the material is multi-layered, or if the material has outer surface with Surface Resistivity >1.0x1012 Ohm per Square, Breakdown Voltage through the material shall be < 4KV
   •  If the material is multi-layered, or if the material has inner surface with Surface Resistivity >1.0x1012 Ohm per Square, Breakdown Voltage through the material shall be < 4KV and Thickness shall be <700 micrometer

Type L2 Liner (semi-conductive/static dissipative)

Type L2 Liner should meet the following criteria:

    •  Made from materials with Surface Resistivity on at least one surface between 1.0x109and 1.0x1012 Ohm per Square.
    •  If the material is multi-layered, or if the material has outer surface with Surface Resistivity >1.0x1012 Ohm per Square, Breakdown Voltage  through the material shall be < 4KV
    •  If the material is multi-layered, or if the material has inner surface with Surface Resistivity >1.0x1012 Ohm per Square, Breakdown Voltage  through the material shall be < 4KV and Thickness shall be <700 micrometer
    •  Liner testing results must be reported for BOTH sides of the liner and show highest and lowest results (to determine if it is L1 or L2 liner)

Type L3 Liner (Insulating)

Type L3 Liner should meet the following criteria:

    •  Made from materials with Surface Resistivity greater than 1.0x1012 Ohm per Square,
    •  Breakdown Voltage through the material shall be less than 4KV

Type of Inner Liner

DESCRIPTION

Type of FIBC

Type L1

Inner liners made from materials with surface resistivity on at least one surface less than or equal to 107 â„¦ Breakdown voltage less than 4 kV

Type C FIBC

 

Type L2

Inner liners made from materials with surface resistivity on at least one surface between 109 â„¦ and 1012 â„¦ Breakdown voltage less than 4 kV

Type B, C or D FIBC

 

Type L3

Inner liners made from materials with surface resistivity of greater than 1012 â„¦ Breakdown voltage less than 4 kV

Type B FIBC

 

Selection Criteria (per IEC 61340-4-4 Ed. 2.0) for Bulk Bag and Liner Combination


There are additional requirements (Ref: IEC 61340-4-4 Ed 2.0: Sec 6 - 9) for labelling and testing a particular type of bulk bag. It is recommended that a thorough risk assessment be conducted before using a bulk bag in potentially hazardous environments. Selecting and using a suitable type of bulk bag and Liner combination is one of the important steps to prevent the risk of fire and explosion.

Please ask our sales specialist which conductive / antistatic bulk bag is ideal for your needs. 

Warning:  If the surface of the Type D FIBC is contaminated or coated by any conductive material (such as water, oil etc) then spark discharges may occur. 
Therefore:  Precautions should be taken in order to prevent the surface contamination.   No conductive object (such as metal items and tools) should be placed on the FIBC.   All conductors in the presence of flammable or explosive atmospheres should be grounded. 
FIBC: Flexible Intermediate Bulk Containers: this is technical and international name of bulk bags

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