PQ’s silica products consist of silica gels and precipitated silicas that are used in a wide range of applications. The Catalysts Group supplies silicas used in catalyst and antiblocking applications; these grades are covered below. For information on PQ's silica products used in foods & beverages, surface coatings, oil processing, fillers/carriers, and personal care, please go to the Performance Chemicals
Silica gels and precipitated silicas are a form of silicon dioxide, the same compound that occurs in nature as sand. However, sand is a crystalline, non-porous form of silicon dioxide, whereas silica gels and precipitated silicas are amorphous (non-crystalline) and highly porous. By carefully controlling surface area, pore volume, particle size distribution, impurities, coatings, and other key characteristics, we can make a range of products optimized for different end uses.
Since 1976, PQ has been producing silica gel supports and catalysts used in the manufacture of polymers, particularly high-density polyethylene (HDPE). Chief among these catalysts are chrome-on-silica products in both granular and microspherical morphologies, sometimes modified with aluminum or titanium to influence polymerization characteristics and final polymer properties.
silicas are used in antiblocking applications to prevent the tendency of opposite faces of polyolefin and polyester films to adhere to one another, such as during winding operations.