Alkali- and heat-resistant inorganic fiber
AssigneeNitto Boseki Co., Ltd.
InventorsOsamu Yamamoto, Keishin Takehara, Yutaka Yasiro
Life of this patent
Estimating the term…
Abstract
The inorganic fiber of this invention comprising as major constituents ______________________________________ % by weight ______________________________________ SiO.sub.2 40-50 CaO 0-10 MgO 15-25 Fe.sub.2 O.sub.3 + FeO 0-10 Al.sub.2 O.sub.3 5-15 MnO 2-15 ______________________________________ (provided that the total amount of CaO, Fe.sub.2 O.sub.3, FeO and MnO is about 20% by weight) is excellent in alkali- and heat-resistances and is useful as a replacement of asbestos in asbestos-cement boards. Titanium oxide (TiO.sub.2) is contained in natural rocks or slags to be used for the meltable material as an impurity in the amount of about 2% by weight.
Claims2
An alkali- and heat-resistant inorganic fiber consisting essentially of
- ______________________________________ % by weight ______________________________________ SiO.sub.2 40-50 CaO 0-10 MgO 15-25 Fe.sub.2 O.sub.3 + FeO 0-10 Al.sub.2 O.sub.3 5-15 MnO 2-15 ______________________________________
- provided that the total amount of CaO, Fe.sub.2 O.sub.3, FeO and MnO is about 20% by weight and having an optional fiber-forming temperature of about 1410.degree.-1460.degree. C.
An alkali- and heat-resistant inorganic fiber consisting essentially of:
- ______________________________________ % by weight ______________________________________ SiO.sub.2 40-50 CaO 0-10 MgO 15-25 Fe.sub.2 O.sub.3 + FeO 0-10 Al.sub.2 O.sub.3 5-15 MnO 2-15 ______________________________________
- provided that the total amount of CaO, Fe.sub.2 O.sub.3, FeO and MnO is about 20% by weight and having a melt viscosity at 1500.degree. C. of about 3.2 poises or less.
Dependencies are inferred from the claim text.