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Pressed parts based on pyrogenically produced silicon dioxide, method of their production and their use

  • US 5,086,031 A
  • Filed: 04/10/1990
  • Issued: 02/04/1992
  • Est. Priority Date: 04/17/1989
  • Status: Expired due to Fees
First Claim
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1. Shaped articles comprising phyrogenically produced silicon dioxide, said shaped articles having the following physicochemical characteristic data:

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    space="preserve" listing-type="tabular">______________________________________ Outer diameter 2 to 15 mm BET surface 50 to 400 m.sup.2 /g Pore volume 0.6 to 1.3 ml/g Breaking 50-150 N strength Pore distribution no pores <

    5 [nm] diameter, only meso and macropores Composition >

    99% by weight SiO.sub.2 Abrasion <

    1.0% Bulk weight 400-500 g/l ______________________________________

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