Plain Bag - Low Breakdown Voltage
Propagating Brush Discharges
• To transport dry, flammable powders
• No flammable solvents or gases present around the bag
Do not use:
• When flammable solvents or gases are present around the bag
Type B FIBC are similar to Type A FIBC in that they are made from plain polypropylene or other non-conductive material. And like Type A bulk bags, Type B bulk bags do not have any mechanism for dissipating static electricity. The difference is that Type B bulk bags are made from materials that have a low breakdown voltage to prevent the occurrence of highly energetic, and dangerous propagating brush discharges (PBD).
There are two ways to achieve a low breakdown voltage in FIBC made from woven polypropylene. The first way is to use uncoated fabric. Although the polypropylene tapes have a high breakdown voltage, the air gaps in the weave of uncoated fabric has a low enough breakdown voltage to prevent PBD occurring. Clearly, Type B FIBC made from uncoated fabric cannot be used to package powders or other materials that produce fines that might leak through the uncoated fabric. The second way of achieving low breakdown voltage is to apply a very thin coating. However, because of the way coatings are applied to bulk bag fabrics, it is likely that holes and tears will occur in very thin coatings. Although a fabric with a very thin coating may have a low breakdown voltage, it is almost certainly incapable of providing the containment and protection required for packaging powders.
Although Type B FIBC can prevent PBD, they cannot be considered antistatic FIBC because they do not dissipate electrostatic charge and so normal brush discharges can still occur, which can ignite flammable solvent vapours. Antistatic bulk bags must have a consistent and reliable mechanism for dissipating static electricity. It is essential that only proven antistatic bulk bags with full static protection are used in any process that involves flammable solvents.
Contact Name: Timothy Zhao
Company Name: Lianyungang Yangyang Plastics Co., Ltd.
Tel: 86-138 1232 8772 or 86-518-82801858
Street Address: No.2 Technology
Road, Lianyun Economic And
Technological Development Zone,
Jiangsu, China 222042
Member name: dangkie
Member Since: 20 September 2010
Total Leads: 8 dangkie Import Export Business Leads
Business focus: Big Bag, Bulk Bag, FIBC
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