Transparent filler masterbatch is an innovative functional filler developed for blown film plastic products. It is made of anhydrous sodium sulphate  as the main ingredient, 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 is compatible with polyolefins. It has excellent dispersion, and light transmission in polyolefins. It is a high-performance, low-cool, and green functional masterbatch.