What is CROHMIQ® brand fabric?How are Type D FIBC tested?Why is CROHMIQ unique?What testing has been done on CROHMIQ?What is a Type C FIBC?Can CROHMIQ FIBC be reused?What is a Type D FIBC?How do you evaluate Type D FIBC?Why is a Type D FIBC preferable to a Type C FIBC?Where are CROHMIQ FIBC purchased?How are static hazards identified?Myths & Misconceptions Explained...What are CENELEC and the IEC?

What is CROHMIQ® brand fabric?

CROHMIQ fabric is a patented, woven polypropylene static protective Type D fabric used in the manufacture of ungrounded bulk bags or FIBC (Flexible Intermediate Bulk Container) for use in flammable gas, vapor and dust atmospheres. FIBC constructed of CROHMIQ fabric provide static protection by dissipating the static charge buildup on the FIBC and by limiting the energy of discharges to prevent an ignition of the flammable environment.

CROHMIQ static protective FIBC are used by Fortune 500 companies and others in a wide range of applications where flammable gas or vapor such as ethylene, toluene or methane or flammable dust such as corn starch, resins, and fertilizers are present.

CROHMIQ FIBC have an outstanding safety record with over 25 million FIBC used since 1995.

Return to Top

Why is CROHMIQ unique?

Special patented static dissipative yarns in the fabric dissipate the static charge by corona discharge.

The use of CROHMIQ static protective FIBC eliminates the need for operators to ground the FIBC prior to filling or emptying. The static dissipative performance is provided by the fabric and does not require special FIBC construction methods. The static dissipative property does not deteriorate over the life of the FIBC and maintains its protective properties through multiple refurbishment cycles.

Return to Top

What is a Type C FIBC?

Type C FIBC use a conductive surface or network to conduct the static charge from the surface of the FIBC to a ground. These FIBC provide safe and effective static protection only if they are well constructed and properly grounded. All conductive elements within the Type C FIBC must be interconnected to the grounding tab which in turn must be grounded during filling and emptying of the FIBC.

Return to Top

What is a Type D FIBC?

Type D FIBC do not require grounding to provide safe, effective protection from hazardous static discharges. The fabric has antistatic properties that dissipate the static charges safely to prevent small sparks and potentially explosive discharges. CROHMIQ's design engineers invented Type D technology and was awarded its first patent in 1995. CENELEC created the Type D FIBC classification after the introduction of the revolutionary CROHMIQ technology.

Return to Top

Why is a Type D FIBC preferable to a Type C FIBC?

According to industry experts, a leading cause of industrial accidents involving FIBC is a Type C FIBC with a broken or missing ground connection (see Britton's article). Isolated Type C FIBC is extremely dangerous because they can produce energetic sparks that can easily ignite flammable gas and vapor and most flammable dust atmospheres. The proper grounding of Type C FIBC is prone to human error. FIBC made of CROHMIQ static protective Type D FIBC fabric have no special construction requirements and do not require grounding.

Return to Top

How are static hazards identified?

The potential static hazards at the locations where FIBC are filled and emptied are dependent on the type and form of the product conveyed, the material handling system during filling or emptying, the flammable environment, and the safety procedures in use. Just as FIBC have a 5:1 or 6:1 safe working load, the FIBC should have a level of safety on static protection. An evaluation of the materials used, machinery, and processes is required to determine the static discharge hazard.

Return to Top

What are CENELEC and the IEC?

CENELEC, the European Committee for Electrotechnical Standardization, was created in 1973 and is a non-profit technical organization composed of the National Electrotechnical Committees of 23 European countries.

The IEC (International Electrotechnical Commission) was founded in 1906 in St. Louis, Missouri, and is presently comprised of 40 countries including the U.S.A. Its stated purpose is to establish standards for a wide variety of electrical products to encourage international trade.

Return to Top

How are Type D FIBC tested?

Charging rate (current), Minimum Ignition Energy (MIE) of the flammable material, and relative humidity are the critical test parameters to establish performance.

The test method closely simulates industrial handling of powders using a test apparatus that fills and empties a FIBC with polypropylene pellets under controlled environmental conditions. A flammable gas probe is used to measure the ignition hazard of the static discharges from the FIBC using gas mixtures of defined MIE. This method is incorporated in the International test standard IEC-61340-4-4.

Return to Top

What testing has been done on CROHMIQ?

CROHMIQ FIBC have been successfully tested using the method described in IEC 61340-4-4 since 1995 by leading test laboratories, customers, and even competitors under a wide variety of test conditions. TEXENE maintains a state of the art testing facility as part of its ongoing commitment to safety, research, and new product development.

Return to Top

Can CROHMIQ FIBC be reused?

CROHMIQ static protective FIBC have been refurbished with wet and dry cleaning processes and reused by customers. A properly designed program for refurbishment including safety testing may allow multiple reuses of a CROHMIQ FIBC.

Return to Top

How do you evaluate Type D FIBC?

When purchasing Type D FIBC for your application, it is important to understand the nature of the static hazard and the level of safety required to protect your employees and customers. The FIBC is just one element of an electrostatically safe and effective material handling system. Look carefully at the test method, the MIE, and the charging rates used, to determine safe performance level.

Return to Top

Where are CROHMIQ FIBC purchased?

TEXENE is proud to offer CROHMIQ fabric to a global network of FIBC Suppliers. These leading FIBC manufacturers will design, produce, and deliver FIBC made of CROHMIQ static protective Type D FIBC fabric to your specifications anywhere in the world. CROHMIQ fabric is available in two colors, CROHMIQ blue™ and CROHMIQ white™. Contact our Sales & Service staff for more information or to locate.

Return to Top

TEXENE LLC, Textile Technologies of the 21st Century
Textile Technologies of the 21st Century

TEXENE LLC is a leading manufacturer of technical textiles focused on delivering precision engineered, safety performance products worldwide.


In the early 1990's, Dr Laurence G. Britton, a highly respected process safety engineer with Union Carbide Corp. (later Dow Corp.), conducted a study of fire and explosion incidents that occurred when FIBC were ...

Following three fatal dust explosions in 2003 alone, the US Chemical Safety & Hazard Investigation Board (CSB) launched a wide ranging study of industrial dust explosions.  This first issue of our Electrostatic Safety ...

The second issue of our Electrostatic Safety Review outlines the development of conductive Type C FIBC and the later development of CROHMIQ, the world's first truly effective Type D FIBC fabric, which provides ...

The third issue in our series of Electrostatic Safety Reviews describes the rigorous testing that is demanded by national and international standards such (IEC, CENELEC, NFPA, etc.) in order to prove the safety of ...

Companies that handle combustible powders in bulk bags, or empty products from bulk bags in environments where flammable solvents may be present rely on safe antistatic FIBC to prevent fires and explosions. Proving safety ...