Common Packaging Misconceptions

         On January 13, 2025, we conducted a special presentation on whether adding sodium sulfate filler to PE films and composite films could optimize costs. On January 9, sodium sulfate particles were immersed in water for testing, and the experiment has continued until now. Today, on March 10, let’s observe the changes.

         Some film blowing manufacturers aggressively add sodium sulfate (Na₂SO₄)-priced at just 3,000 RMB/ton - as filler to cut costs. While adding 15% sodium sulfate reduces material cost by 27%, and 20% delivers savings of 36%, the apparent per-kg price drop actually increases end-user costs.