Anti-blocking Precipitated Silica | Film Opening Additive Anti-blocking silica is amorphous precipitated silicon dioxide, a premium additive for plastic films and opening masterbatch. It creates tiny micro bumps on film surface to separate stacked film layers, effectively preventing blocking during winding, storage and unwinding. Supplied by Shandong Zhonglian Chemical Co., Ltd., this grade balances excellent opening performance with low haze and high film clarity. Our silica meets global food-contact standards with ISO 22000, KOSHER, HALAL and REACH certifications. Particle size and oil absorption can be tailored for BOPP, PE, PP and PET films. Full TDS, MSDS, COA available for your formulation and registration. Key Benefits •Reliable anti-blocking effect without sacrificing film transparency •Low heavy metal, food contact compliant •Stable batch consistency for high-speed film production •Customizable particle size for thin / thick film grades •Bulk export packaging & flexible trade terms Spec Highlights SiO₂ ≥ 97.5% · D50: 3 – 7 μm · BET: 100 – 140 m²/g · DBP absorption: 80 – 120 cm³/100g · Whiteness L* ≥ 97.5 Packing: 10 / 15 / 20 kg waterproof kraft bags. Trade: FOB Qingdao, CIF, DDP. Application: BOPP, PE, PP, PET packaging film, anti-blocking masterbatch.