Chemical PE Square Bottom Valve Bag

Engineered Chemical Resistance​

These bags make the most of polyethylene's natural ability to resist chemical reactions-especially high-density HDPE and specialized formulas. They can handle long-term contact with strong substances like 30% sulfuric acid, 40% caustic soda, and highly concentrated salt solutions. When tested by immersion according to ASTM D543 standards, they gain less than 0.5% in weight. For chemicals that tend to oxidize, such as hypochlorite solutions, we add a 5-10μm fluoropolymer coating. This coating makes them three times more effective at containing these substances compared to standard PE bags.​

Controlling static electricity is extremely important when handling powders. Our antistatic mixtures, which use either acetylene black or quaternary ammonium additives, keep surface resistivity between 10⁶-10¹¹Ω. This goes beyond the requirements set by ISO 61340-5-1 Type C. We also include grids of conductive fibers spaced 50mm apart. These grids allow static charges to drain away in less than two seconds, which helps prevent fires when packaging flammable powders like titanium dioxide or epoxy powders.​

Barrier Performance & Containment Assurance​

We use a coextruded layer of EVOH, which drastically reduces how much solvent can pass through the bags-less than 0.1g per square meter every 24 hours, according to ASTM E96 testing. This is especially useful for keeping volatile organic compounds from escaping, like those in paint thinners or products made with ethanol. The bags also block oxygen effectively, allowing less than 50cc to pass through per square meter every 24 hours (tested to ASTM D3985 standards). This protects light-sensitive peroxides while they're being stored. What's more, the valve design uses heat to create a tight seal, which means there's no risk of leaks-something that's often a problem with bags that are stitched closed.​

Structural Integrity for Industrial Handling​

Chemical PE square bottom valve bag are built to withstand the tough conditions of supply chains. The standard walls, which are 80-200μm thick, can support stacks of 25kg materials up to 8 pallets high. Our block-bottom fusion process creates seals 15-20mm wide at temperatures between 180-220°C. This results in a tear resistance of more than 30N, as measured by ASTM D1922. When it comes to drop tests, fewer than 5% of the bags fail when dropped from 1.5m with a 50kg load inside. We also use a cross-hatched "well" pattern for the seals at the bottom. This design can handle heavy, dense materials like bentonite without the bottom splitting open.​

While these bags do cost 15-20% more upfront than woven polypropylene bags, they last three to five times longer. They eliminate the losses that come from spills due to broken seams, and there's no need for extra sealing steps. For dangerous materials like nitrocellulose, we offer flame-retardant versions with a limiting oxygen index (LOI) of at least 27%. These come with static-dissipative valves and meet the packaging standards set by the IMDG Code.

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