Saline soluble inorganic fibres

  • US 5,994,247 A
  • Filed: 07/23/1997
  • Issued: 11/30/1999
  • Est. Priority Date: 01/17/1992
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of insulating an article comprising:

  • (A) disposing on, in, near, or around the article thermal insulation which is a refractory insulating material having a maximum service temperature greater than 900°

    C. and comprising vitreous fibers having a composition comprising SiO2, CaO, MgO, and optionally Al2 O3, wherein;

    (a) SiO2 is present in an amount less than or equal to 71.24 percent by weight and (1) greater than 58% by weight SiO2, if the amount of MgO in the composition is in the range 0 through 10 percent by weight;

    or (2) greater than the sum of (58+0.5(weight percent of MgO--10)) percent by weight SiO2, if the amount of MgO in the composition is greater than 10 percent by weight;

    (b) greater than 0 and less than or equal to 42 percent by weight CaO;

    (c) greater than 0 and less than or equal to 31.33 percent by weight MgO; and

    (d) 0 to less than 3.97 percent by weight Al2 O3 ;

    wherein;

    the refractory insulation material has a maximum service temperature greater than 900°

    C.;

    the refractory insulation material has a shrinkage of less than 3.5 percent when exposed to a temperature of 1000°

    C. for 24 hours, and has a shrinkage of less than 3.5 percent when exposed to a temperature of 800°

    C. for 24 hours; and

    wherein the refractory insulation material is essentially free of alkali metal oxide and boron oxide fluxing components; and

    (B) exposing said insulated article to a temperature above around 900°

    C. for 24 hours.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×