The sustained crushing and cooling enhances the bulk density, producing flakes having an average thickness of 0.010 inch to 0.035 inch.

In this silver powder the 50% particle diameter as measured by laser diffraction is 3-8 μm and the average thickness is 20-40 nm.

The average thickness of the other wall section is greater than the average thickness of the deformation section.

The average second portion thickness is less than half an average first portion thickness.

The topcoat layer (14) has an average thickness (Dave) of 2 to 50 nm and a fluctuation (ΔD) in thickness of 40% or less of the average thickness (Dave).

The average thickness of the whole layers is 20-200μm and the average thickness of the high-barrier organic layer is 2-25μm.

The average film thickness of the X direction barrier pattern is smaller than the average film thickness of the Y direction barrier pattern.

R2P1 = the average thickness of the skin

The average layer thickness is generally between 10 nm and 1 μm.

The average thickness of the polymer is set at 3 to 50 nanometers.

The average thickness of the gap in the thick regions greatly exceeds (by at least ten times) the gap's average thickness in the thin regions.

The average thickness of the internal structural support piece is less than 2 mm.

If t1 is the average thickness of the compound (B1) layers and t2 is the average thickness of the compound (B2) layers, the ratio t2/t1 satisfies the relational expression 0.5 < t2/t1 ≤ 10.

The ratio R1=ODO/E of the mean minimum thickness ODO of elastomer present on the back of the sheath to the mean thickness E of the reinforced product (21) is less than or equal to 0.17.

The average thickness of the hinge sheet is preferably 50 to 300μm.