ISO 20871:2001 pdf download

ISO 20871:2001 pdf download.Footwear – Test methods for outsoles -Abrasion resistance.
3.3
relative volume loss
the volume loss, in cubic millimetres, of the test rubber after being subjected to
an abrasive cloth will cause the appropriate standard rubber (see clause
4649:1 985) to lose a mass of 200 mg under the preferred conditions, namely
40 m, a load of 10 N and using a non-rotating test piece
4 Apparatus and materials
The following apparatus and material shall be used:
4.1 Abrasion machine
abrasion by B.1 of ISO a distance of
The test apparatus (see figure 1) consists of a laterally movable rotatable cylindrical drum to which the abrasive cloth (4.2) is fixed.
test piece
holder and a
The drum shall have a diameter of 150 mm ± 0,2 mm and a length of about 500 mm and shall be rotated at a frequency of 40 min1 ± 1 min1, the directions of rotation being as indicated in figure 1.
The test piece holder shall consist of a cylindrical opening, the diameter of which can be adjusted from 15,5 mm to 16,3 mm, and a device for adjusting the length of the test piece protruding from the opening to 2 mm ± 0,2 mm. The holder shall be mounted on a swivel arm which in turn is attached to a sledge which can be moved laterally on a spindle. The lateral displacement of the holder shall be 4,20 mm ± 0,04 mm per revolution of the drum.
The centre direction of of the drum
axis of the holder shall have an inclination of 32 to rotation (see figure 1), and shall be placed directly to within ± 1 mm.
the perpendicular in the above the longitudinal axis
The swivel arm and test piece holder shall be free from vibration during operation, and disposed such that the test piece is pressed against the drum with a vertical force of 10 N ± 0,2 N obtained by adding weights to the top of the test piece holder.
The abrasive cloth shall be attached to the drum using three evenly spaced strips of double-sided adhesive tape extending along the complete length of the cylinder. Care shall be taken to ensure that the abrasive cloth is firmly held so as to present a uniform abrasive surface over the whole area of the cylinder. One of the strips shall be placed where the ends of the abrasive cloth meet. Ideally the ends should meet exactly, but any gap left between them shall not exceed 2 mm. The adhesive tape shall be about 50 mm wide and not more 0,2 mm thick.
Placement of the test after an abrasion run cases of very high (equivalent to 42 revolution counter
piece on to the cloth at the beginning of a test run, and its removal of 40 m (equivalent to 84 revolutions), shall be automatic. In special volume loss of the test piece, an abrasion distance of only 20 m revolutions) may be used. If using an abrasion distance of 20 m, a or automatic stopping device should be connected to the drum.
To protect the abrasive cloth from damage by the test piece holder, a device for switching Page 6
EN 12770:1 999
off the apparatus just before the lower edge of the test piece holder touches the cloth is recommended.
4.2 Abrasive cloth
Abrasive cloth made with aluminium oxide of grain size 60, at least 400 mm wide, 473 mm long and 1 mm average thickness, shall be used as the abrasive medium. This abrasive surface shall cause a mass loss between 180 mg and 220 mg for an abrasion distance of 40 m.
When each new sheet of cloth is first used, the direction of motion shall be indicated on the sheet, as it is important that the same direction be used for all subsequent test runs. NOTE Suitable paper abrasive cloth is listed in annex A of ISO 4649:1985.
4.3 Hollow Drill
The specification for the hollow drill is given in detail in figure 2.
The frequency of rotation of the drill needs to be at least 1 000 min1 for most outsoles materials.
4.4 Balance
The balance shall be of sufficient accuracy to enable the mass loss of a test piece to be determined to ± 1 mg.
4.5 Standard rubbers
Specifications for standard rubbers are given in detail in annex B (see clause B.1) of ISO
4649:1985.
5 Sampling and conditioning
The test pieces shall be cylindrical in shape, of diameter 16 mm ± 0,2 mm, with a minimum height of 6 mm. If test pieces of the required thickness are not available, the necessary thickness may be obtained by bonding a piece of the outsole to a base element of hardness not less than 80 IRHD. The thickness of this outsole should be not less than 2 mm.
Minimum three test pieces are necessary.