This copper alloy contains 1.5 mass% to 2.7 mass% Fe, 0.008 mass% to 0.15 mass% P, and 0.01 mass% to 0.5 mass% Zn, with the remainder being Cu and unavoidable impurities.

Of the total of (A)‑(E) (100 mass%), (A) is 10‑50 mass%, (B) is 5‑35 mass%, (C) is 15‑75 mass%, (D) is 1‑12 mass%, and (E) is 0.1‑5 mass%.

The alloy contains from 10.5 mass% to 16.0 mass% Li and from 0.50 mass% to 1.50 mass% Al with the remainder comprising Mg.

Said modifier also contains the following ingredients: 27-66 mass % SiO2, 4-23 mass % Al2O3, 4-19 mass % SO3, 3-17 mass % CaO, 7-14 mass % of other oxides and 3-16 % mass % of ignition loss.

The contents of metal, oxygen and nitrogen in WC are ≤ 0.1 mass%, ≤ 0.5 mass% and ≤ 0.5 mass%, respectively.

The unavoidable impurities are O: not more than 0.15% by mass, N: not more than 0.1% by mass, C: not more than 0.1% by mass, Al: not more than 0.05% by mass, and Si: not more than 0.1% by mass.

The iron powder comprises 99.7 mass% or more of iron, 0.002 mass% or less of carbon, 0.001 mass% or less of nitrogen, and between 0.01 mass% and 0.04 mass% of oxygen in the form of oxide particles.

sheep's or lamb's wool, not carded or combed

Suitable graphite content of the fiberglass material is about 0.25 wt% to about 0.50 wt%, or about 0.25 wt% to about 1.0 wt%, or about 0.8 wt% of dry weight of the glass fibers.

The alloy further contains, with respect to the main component, 0.01-0.3 mass % Mn, 0.0001-0.01 mass % Al, 0.001-0.03 mass% Ti, 0.005-0.2 mass % Cu, and 0.001-0.05 mass % S.

The carbonate content in the composition is not less than 10% by mass and less than 100% by mass, and the hydroxide content is more than 0 part by mass and not more than 5 parts by mass per 100 parts by mass of the carbonate.

The content of the oxidant is from 0.25% by mass to 5% by mass (inclusive), and the content of the silica particles is 0.01% by mass or more but less than 20% by mass.

Preferably, each composition comprises 10-60 mass% Ag2O, 5-65 mass% V2O5, and 15-50 mass% TeO2.

The powder mixture (3) contains 0.4 mass% to 0.8 mass% of the lubricant.

The fiber mass comprises 70-100 mass% Al2O3 and 0-30 mass% SiO2.