Transparent filler masterbatch is an innovative functional filler developed for blown film plastic products. It is made of anhydrous sodium sulphate  as the main content, which has unique particle size distribution that contributes to its optical property. After special surface treatment, the sodium sulfate is mixed with carrier and additives as an optimized combination. The product has excellent compatibility, dispersion and light transmission in PE, PP and more polymer systems, and is a high-performance, low-cost, and green functional masterbatch.