BS EN ISO 17235-2015 pdf download.Leather – Physical and mechanical tests 一 Determination of softness.
This International Standard specifies a non-destructive method for determining the softness of leather. It is applicable to all non-rigid leathers, e.g. shoe upper leather, upholstery leather, leathergoods leather, and apparel leather.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
Iso 2418, Leather — Chemical, physical and mechanical and fastness tests — Sampling location Iso 2419, Leather — Physical and mechanical tests — Sample preparation and conditioning
3 Principle
A cylindrical rod of defined mass is lowered at a specified rate onto a securely clamped area of leather. The distension of the leather produced is recorded as the softness.
4 Apparatus
4.1 Test machine, shown in Figure 1. including the parts described in 4d.1 to 41J.
4.1.1 Circular aperture, A, diameter 35,0 mm ± 0,1 mm.
4.1.2 Metal rings, able to fit into aperture A and reduce the diameter of the aperture to
25,0 mm ± 0,1 mm and 20,0 mm ± 0,1 mm, respectively.
NOTE The apertures described above are more conveniently referred to by their nominal diameters of 35 mm. 25 mm. and 20 mm, respectively.
4.1.3 Clamps, B, capable of holding the leather securely both before the load pin is released and when the maximum force is applied while leaving the portion over the aperture free to move.
4.1.4 Cylindrical load pin. C, diameter 4,9 mm ± 0,1 mm and length 11,5 mm ± 0,1 mm rigidly attached to a cylindrical mass, D. The total mass of load pin and cylindrical load shall be 530 g ± lOg.
4.1.5 Means of guiding the load pin, such that the load pin acts perpendicularly to the leather surface and the vertical travel of the load pin is restricted to a distance of 11,5 mm ± 0,1 mm.
4.1.6 Means of lowering the load pin, such that the load pin travels its full permitted distance of 11,5 mm ±0,1 mm in 1,5 s ± 0,5 s.
4.1.7 Gauge, reading to 0,1 mm, to directly measure the distension of the leather by the load pin.BS EN ISO 17235 pdf download.