Amorphous silica
Amorphous silica or non-crystalline, is usually prepared by vapor-phase hydrolysis, precipitation or other processes that ensure the absence of crystalline free silica. Three forms of synthetic amorphous silica are classified according to their method of preparation: silica gel (silica G), precipitated silica (silica P) and fumed silica (silica F). There are several naturally-occurring and synthetic amorphous silicas, namely diatomaceous earth, precipitated silica, silica gel, fumed silica and silica fume (thermally generated). In amorphous silica, X-rays are scattered randomly and no discrete reflections are seen. All types of amorphous silica can be converted to crystalline forms when heated to a sufficiently high temperature.
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The use of silica :
Tire & Rubber Goods (Manufactured Rubber Goods & Tire)
Polymer Performance (Organic Rubber For Footwear, Plastics and TPE, Polymer
for Membranes
Silicone Elastomers), Nutritions & Industrial (Specialties, Nutritions,
Industrial Specialties), Performance Silicas (Dentifrice).
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