How to Choose Custom Bulk Bags for Highly Corrosive Chemicals
2025-08-04 14:27
In the chemical and new energy sectors, bulk bags have long faced challenges of leakage from packaging containing strong acids, strong bases, and organic solvents. Traditional bulk bags suffer from caking and embrittlement caused by corrosion, resulting in significant annual losses for companies. To truly solve this problem, a comprehensive consideration of material properties, structural processes, and scenario adaptation is required.
Material properties determine the baseline of protection. Firstly, the base fabric is recommended to be a composite material of polypropylene (PP) and high-density polyethylene (HDPE). This type of material remains stable even in environments with 98% concentrated sulfuric acid or 50% liquid alkali, with tested anti-swelling properties more than three times that of ordinary base fabrics. Secondly, the inner protective layer can use a PE anti-leakage membrane with a thickness of over 0.15mm, effectively blocking highly permeable solvents such as dichloromethane, with volatile organic compound residues below the food-grade threshold of 0.01 ppm. The sewing process uses hot melt bonding to avoid corrosion risks from needle holes, and the bonded seam strength is recommended to be maintained above 2200N/5cm, which is 2.2 times the current national standard.
Structural processes play a role in ensuring safe transportation. The sling system must achieve a safety factor of 6:1, preferably using ring or cross structures to disperse the gravitational impact of corrosive materials. Key sealing points require special reinforcement: the discharge port is equipped with double flap valves, and the filling port uses a double insurance design of heat sealing plus mechanical binding to minimize the escape of corrosive dust. For common three-dimensional stacking scenarios in hazardous chemical warehouses, the bag bottom should use a dense weaving process to ensure no deformation under a three-layer pressure of 6 tons.
Scenario adaptation expands the application boundaries. When transporting special media such as hydrofluoric acid, a fluorinated inner lining can be added for enhanced protection; easily oxidized materials are suitable for aluminum foil composite layers to isolate air. For companies with high transportation environment requirements, smart bags equipped with RFID permeability monitoring chips can be selected to track the aging status of the bag in real time. In terms of environmental recycling, an all-PP single material structure is more conducive to the recycling of discarded bags.
Practical application verifies the value of selection. When a lithium battery company in East China transported raw materials containing 30% hydrofluoric acid, switching to bulk bags that met the above standards reduced the damage rate from 8% to less than 0.3%, increased the turnover of each bag to more than 6 times, and cut annual loss costs by over 2 million yuan. Such practices confirm the dual benefits of scientific selection on efficiency and cost.
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