Silica sand filler type

The recovered glassfiber-resin powder was tested as a filler for polymer mortars[3]. The mortars were composed of filler, silica sand and binder, dried for one day, and cured at 70°C for 15 hrs. A glassfiber-resin powder and a calcium carbonate powder for comparison (each with an average size of 52 // m) were used as fillers. Bisphenol F type epoxy resin, poly methacrylic methyl (PMMA), and unsaturated polyester (UP) were used as binders. 

The common availability of silica is not the sole reason for its extensive use. Probably, it is the chemical inertness and durability of silica which determined its popularity. The fillers discussed here include not only natural minerals but also a variety of synthetic products. Natural products can be divided into crystalline and amorphous. Crystalline silica fillers include sands, ground silica (or silica flour), and a form of quartz - tripoli, whereas the amorphous types include diatomaceous earth. 

Acid-resisting Cement. The principal types are as follows 1. Silicate an inert filler bonded with silica gel that has been precipitated in situ from Na- or K- silicate in the presence of Na2SiFg, or from silicon ester. 2. Rubber Latex essentially cement sand mixes impregnated with rubber. 3. Synthetic Resin with an inert filler. 4. Sulphur Cements usually with sand as filler. 5. Bituminous Cements. ASTM specifications for these materials are listed in Vol 4-05 of the Annual Book of ASTM Standards, and number some 25, including specifications for mortars and grouts. 

---